Free calculator widgets for your website

Give your readers a working calculator right inside your article. Every CalcWorthy calculator can be embedded on any website, blog or learning platform for free — no account, no API key, no cost.

How to add a calculator

Pick a calculator below and copy its code.
Paste it into your page as HTML (in WordPress use a Custom HTML block; in Blogger, Wix or Squarespace use the HTML/embed element).
Publish. The calculator resizes itself to fit your layout and works on phones.

What you get

No ads inside the widget and no cookies — the calculator runs in your visitor's browser and the numbers they type are never sent anywhere.
Accurate and maintained. Every formula is tested against known results each time the site is updated, and fixes reach your page automatically.
Light and fast. It loads lazily, so it doesn't slow down the rest of your page.

The only condition: keep the small "Calculator by CalcWorthy" credit line under the widget.

Finance

Mortgage Calculator

Estimate your monthly mortgage payment with property tax, insurance, PMI and HOA. See total interest and a full amortization schedule. Free and instant. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/mortgage-calculator/" title="Mortgage Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Inflation Calculator

See what a dollar amount from any year since 1913 is worth in another year, using official BLS CPI-U data. Shows total and average yearly inflation. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/inflation-calculator/" title="Inflation Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Debt Snowball vs Avalanche Calculator

Compare the debt snowball and avalanche methods for up to 5 debts: months to debt-free, total interest, payoff order and how much avalanche saves. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/debt-payoff-calculator/" title="Debt Snowball vs Avalanche Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Paycheck Calculator

Estimate your 2026 take-home pay per paycheck from a salary or hourly wage: federal income tax, Social Security, Medicare, 401(k) and state tax by pay period. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/paycheck-calculator/" title="Paycheck Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

EMI Calculator

Calculate the monthly EMI on a home, car or personal loan in rupees, the total interest over the tenure and a year-by-year repayment schedule. Free and instant. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/emi-calculator/" title="EMI Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

SIP Calculator

Estimate the maturity value of a monthly mutual fund SIP in rupees: total invested, estimated returns and a year-by-year table, with an optional annual step-up. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/sip-calculator/" title="SIP Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Home Affordability Calculator

How much house can you afford? Find your maximum home price and monthly payment from income, debts and down payment using the 28/36 DTI rule. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/home-affordability-calculator/" title="Home Affordability Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Refinance Calculator

See if refinancing your mortgage pays off: new monthly payment, monthly savings, break-even point on closing costs and lifetime interest savings. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/refinance-calculator/" title="Refinance Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Amortization Calculator

Build a full loan amortization schedule. See your payment, total interest and payoff date, and how much time and interest extra monthly payments save. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/amortization-calculator/" title="Amortization Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Loan Calculator

Calculate the monthly payment, total interest and total cost of a personal loan or any fixed-rate loan, with a full payment schedule. Free and instant. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/loan-calculator/" title="Loan Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Auto Loan Calculator

Estimate your car payment with sales tax, fees, down payment and trade-in. See the amount financed, total interest, total cost and a term comparison. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/auto-loan-calculator/" title="Auto Loan Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Credit Card Payoff Calculator

Find out how long it takes to pay off a credit card and how much interest you will pay, or the monthly payment needed to be debt free by a target date. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/credit-card-payoff-calculator/" title="Credit Card Payoff Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Compound Interest Calculator

See how savings grow with compound interest and monthly contributions. Pick daily, monthly, quarterly or annual compounding and view a year-by-year table. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/compound-interest-calculator/" title="Compound Interest Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Savings Goal Calculator

Find out how much to save each month to reach a savings goal by a set date, counting the money you already have and the interest your savings earn. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/savings-goal-calculator/" title="Savings Goal Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Retirement Calculator

Project your retirement savings from your age, savings and monthly contributions. See the total in today’s dollars and a 4% rule income estimate. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/retirement-calculator/" title="Retirement Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

401(k) Calculator

Estimate your 401(k) balance at retirement from your contributions, employer match, salary raises and investment growth. See exactly what the match adds. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/401k-calculator/" title="401(k) Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

CD Calculator

Calculate the interest and ending balance of a certificate of deposit from the deposit, APY or rate, term and compounding. APY vs APR explained. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/cd-calculator/" title="CD Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Simple Interest Calculator

Calculate simple interest and the total amount from principal, rate and time in years, months or days. Shows the I = Prt formula and a compound comparison. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/simple-interest-calculator/" title="Simple Interest Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

ROI Calculator

Calculate return on investment (ROI) as a percentage, your gain or loss, and annualized ROI (CAGR) to compare investments held for different lengths. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/roi-calculator/" title="ROI Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Budget Calculator

Split your monthly take-home pay into needs, wants and savings with the 50/30/20 budget rule, or a variant for high-cost areas. See monthly and yearly amounts. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/budget-calculator/" title="Budget Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Salary to Hourly Calculator

Convert an annual salary to an hourly wage, or any pay rate to daily, weekly, biweekly, semimonthly, monthly and yearly pay. Set your own hours and weeks. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/salary-to-hourly-calculator/" title="Salary to Hourly Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Christmas Budget Calculator

Plan your Christmas spending on gifts, food, decorations and travel, then see how much to set aside each week or each paycheck until December 25. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/christmas-budget-calculator/" title="Christmas Budget Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Business

Profit Margin Calculator

Find gross profit margin, profit and markup from cost and selling price, or work out the price you need to charge to hit a target margin. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/profit-margin-calculator/" title="Profit Margin Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Markup Calculator

Add a markup percentage to your cost to get the selling price, profit and resulting gross margin. Includes a markup-to-margin conversion table. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/markup-calculator/" title="Markup Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Break-Even Calculator

Find how many units you must sell to cover fixed costs: break-even units, break-even revenue, contribution margin and the volume for a target profit. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/break-even-calculator/" title="Break-Even Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Sales Tax Calculator

Add sales tax to a price or work backward from a tax-inclusive total to the pre-tax price. Shows the tax amount and compares other rates. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/sales-tax-calculator/" title="Sales Tax Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Discount Calculator

Calculate the sale price and how much you save, including stacked discounts like 20% off plus an extra 10%. Shows the true combined discount. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/discount-calculator/" title="Discount Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Tip Calculator

Calculate the tip and total for any bill, split it between people and round each share up to a whole dollar. Compare 10% to 25% tips at a glance. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/tip-calculator/" title="Tip Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Health

TDEE Calculator

Estimate your total daily energy expenditure (maintenance calories) from BMR and activity level, compare three equations, and get cut and bulk calorie targets. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/tdee-calculator/" title="TDEE Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

BMI Calculator

Calculate your body mass index in pounds or kilograms. See your CDC weight category, the healthy weight range for your height and your BMI Prime. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/bmi-calculator/" title="BMI Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Calorie Calculator

Estimate how many calories you burn per day with the Mifflin-St Jeor equation, plus daily targets for gradual weight loss or weight gain. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/calorie-calculator/" title="Calorie Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Body Fat Calculator

Estimate your body fat percentage with the U.S. Navy circumference method using a tape measure. See your ACE category, fat mass and lean mass. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/body-fat-calculator/" title="Body Fat Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Pregnancy Due Date Calculator

Estimate your due date from your last period, conception date or IVF transfer. See how far along you are, your trimester and key pregnancy milestones. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/due-date-calculator/" title="Pregnancy Due Date Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Ovulation Calculator

Estimate your next ovulation date, fertile window and next period from your cycle. Includes a calendar of your next six cycles. Not a form of birth control. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/ovulation-calculator/" title="Ovulation Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Ideal Weight Calculator

Find your ideal body weight with the Robinson, Miller, Devine and Hamwi formulas, side by side with the healthy BMI weight range for your height. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/ideal-weight-calculator/" title="Ideal Weight Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
<script>addEventListener('message',function(e){if(e.origin==='https://calcworthy.com'&&e.data&&e.data.cwHeight)document.querySelectorAll('iframe').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cwHeight+'px'})})</script>

Sleep Calculator

Find when to go to bed or set your alarm so you wake between 90-minute sleep cycles. Includes time to fall asleep and recommended hours by age. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/sleep-calculator/" title="Sleep Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Running Pace Calculator

Calculate running pace per km or mile, race finish time, or distance. Converts min/km ↔ min/mile and shows 5K, 10K, half and marathon times. Open the full calculator · Preview the widget

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Math

Percentage Calculator

Work out any percentage: X% of Y, what percent one number is of another, percentage change, and increasing or decreasing by a percent. Steps shown. Open the full calculator · Preview the widget

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Fraction Calculator

Add, subtract, multiply and divide fractions. Get the answer in lowest terms, as a mixed number and as a decimal, with every step shown. Open the full calculator · Preview the widget

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GPA Calculator

Calculate your GPA on the standard 4.0 scale from letter grades and credit hours. Add your previous GPA to get your new cumulative GPA. Open the full calculator · Preview the widget

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Final Grade Calculator

Find the score you need on your final exam to reach the overall grade you want, based on your current grade and how much the final is worth. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/grade-calculator/" title="Final Grade Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Random Number Generator

Generate random whole numbers in any range, with or without duplicates and optionally sorted. Fair, unbiased and secure — runs in your browser. Open the full calculator · Preview the widget

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Test Grade Calculator

Enter the number of questions and how many were wrong to get the percentage and letter grade, plus a printable grading chart for every possible score. Open the full calculator · Preview the widget

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Percent Difference Calculator

Find the percent difference between two values, |A − B| ÷ their average × 100, plus the percent change in both directions, and when to use which. Open the full calculator · Preview the widget

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Scientific Calculator

Type a whole expression with parentheses, powers, roots, trig, logs, factorials and percentages. Degrees or radians, full-precision result, no app needed. Open the full calculator · Preview the widget

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Volume Calculator

Volume of a cube, box, cylinder, sphere, hemisphere, cone, pyramid, triangular prism or capsule in cm, m, inches or feet — with liters, gallons and the formula. Open the full calculator · Preview the widget

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Area Calculator

Area of a square, rectangle, triangle (base-height or three sides), circle, ellipse, trapezoid, parallelogram, polygon or sector, with m², ft² and acres. Open the full calculator · Preview the widget

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Slope Calculator

Find the slope between two points, the angle in degrees, percent grade, distance, midpoint, y-intercept, perpendicular slope and the line equation y = mx + b. Open the full calculator · Preview the widget

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Ratio Calculator

Simplify a ratio to lowest terms, split a total in a given ratio (500 in 3:2 = 300 and 200), or check whether two ratios are equivalent. Decimals welcome. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/ratio-calculator/" title="Ratio Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Proportion Calculator

Solve a/b = c/d for the missing value by cross-multiplication with the steps shown, or enter all four numbers to test whether the proportion is true. Open the full calculator · Preview the widget

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LCM Calculator

Find the least common multiple of two or more numbers with the prime-factorization steps shown, plus the GCF of the same numbers. Up to 20 numbers. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/lcm-calculator/" title="LCM Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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GCF Calculator

Find the greatest common factor (GCD, HCF) of two or more numbers with Euclid's algorithm and prime-factorization steps shown. LCM included. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/gcf-calculator/" title="GCF Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Factor Calculator

List every factor of a number, its factor pairs and prime factorization, the sum of its factors, and whether it is prime or a perfect square (up to 10¹²). Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/factor-calculator/" title="Factor Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Binary Converter

Convert between binary, decimal, octal and hexadecimal numbers of any size. See the bit count, the value padded to full bytes, and the divide-by-2 steps. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/binary-converter/" title="Binary Converter" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Average Calculator (Mean, Median, Mode)

Paste a list of numbers to get the mean (average), median, mode, range, sum and count instantly, with the working shown. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/average-calculator/" title="Average Calculator (Mean, Median, Mode)" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Standard Deviation Calculator

Find the sample or population standard deviation and variance of a data set, with the mean, standard error and a step-by-step table. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/standard-deviation-calculator/" title="Standard Deviation Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Date & Time

Time Zone Converter

Convert a date and time between New York, London, Paris, Dubai, India, Singapore, Tokyo, Sydney and 40 more zones. Daylight saving handled automatically. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/time-zone-converter/" title="Time Zone Converter" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
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What Is Today's Date?

Today's date with the day of the week, day of the year, ISO week number, days left in the year, quarter, leap-year status and the dates 7 to 180 days ahead. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/todays-date/" title="What Is Today's Date?" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Hijri Date Converter

Convert Gregorian dates to Hijri and Hijri dates to Gregorian with the official Umm al-Qura calendar. Shows the weekday and month names in English and Arabic. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/hijri-date-converter/" title="Hijri Date Converter" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Age Difference Calculator

Find the exact age difference between two people from their birth dates: years, months and days, total days and weeks, and who is older. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/age-difference-calculator/" title="Age Difference Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Chronological Age Calculator

Chronological age for testing in years;months;days using the borrowing method, with rounding options and corrected age for premature babies. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/chronological-age-calculator/" title="Chronological Age Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Time Card Calculator

Weekly time card calculator: enter start and end times for each day minus unpaid breaks to get total hours, overtime after 40 hours and gross pay. Open the full calculator · Preview the widget

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Age Calculator

Find your exact age in years, months and days, plus total weeks and days lived, your next birthday and the day of the week you were born. Open the full calculator · Preview the widget

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Days Between Dates Calculator

Count the days between two dates, with weeks, months and years, business days (choose your weekend) and an option to include the end date. Open the full calculator · Preview the widget

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Days From Today Calculator

Add or subtract days, weeks, months or years from any date to find the resulting date and weekday. Handles leap years and month-end dates correctly. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/add-days-calculator/" title="Days From Today Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Hours Calculator

Calculate hours worked between two times minus unpaid breaks, as hours:minutes and decimal hours for timesheets, with pay. Overnight shifts handled. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/hours-calculator/" title="Hours Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Countdowns

Days Until Christmas

How many days until Christmas? A live countdown in days, weeks and sleeps to December 25, plus the weekday of Christmas for the next several years. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/days-until-christmas/" title="Days Until Christmas" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Days Until Halloween

How many days until Halloween? See the live countdown to October 31 in days and weeks, plus the weekday Halloween falls on for the next several years. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/days-until-halloween/" title="Days Until Halloween" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Days Until Thanksgiving

How many days until Thanksgiving? Live countdown to U.S. Thanksgiving, the fourth Thursday of November, with dates for the next several years. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/days-until-thanksgiving/" title="Days Until Thanksgiving" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Days Until Black Friday

How many days until Black Friday? A live countdown to the day after Thanksgiving, with Black Friday and Cyber Monday dates for the coming years. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/days-until-black-friday/" title="Days Until Black Friday" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Days Until New Year

How many days until New Year? A live countdown to January 1 in days and weeks, plus the weekday of New Year’s Day for the next several years. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/days-until-new-year/" title="Days Until New Year" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Days Until Valentine’s Day

How many days until Valentine’s Day? A live countdown to February 14 in days and weeks, with the weekday of Valentine’s Day for upcoming years. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/days-until-valentines-day/" title="Days Until Valentine’s Day" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Days Until Easter

How many days until Easter? A live countdown to Easter Sunday, with Western and Orthodox Easter dates and Ash Wednesday for the next several years. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/days-until-easter/" title="Days Until Easter" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Days Until Mother’s Day

How many days until Mother’s Day? A live countdown to U.S. Mother’s Day, the second Sunday of May, plus UK Mothering Sunday dates for coming years. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/days-until-mothers-day/" title="Days Until Mother’s Day" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Days Until Father’s Day

How many days until Father’s Day? A live countdown to the third Sunday of June, with U.S. and Australian Father’s Day dates for coming years. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/days-until-fathers-day/" title="Days Until Father’s Day" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Days Until the 4th of July

How many days until the 4th of July? A live countdown to Independence Day, with the weekday and federal observed date for the next several years. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/days-until-4th-of-july/" title="Days Until the 4th of July" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Days Until Ramadan

How many days until Ramadan? A live countdown to 1 Ramadan on the Umm al-Qura calendar, with start dates, first nights and Eid al-Fitr for coming years. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/days-until-ramadan/" title="Days Until Ramadan" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Days Until Eid al-Fitr

How many days until Eid al-Fitr? A live countdown to 1 Shawwal on the Umm al-Qura calendar, with Eid al-Fitr dates and weekdays for the coming years. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/days-until-eid-al-fitr/" title="Days Until Eid al-Fitr" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Days Until Eid al-Adha

How many days until Eid al-Adha? A live countdown to 10 Dhu al-Hijjah on the Umm al-Qura calendar, with Day of Arafah and Eid dates for coming years. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/days-until-eid-al-adha/" title="Days Until Eid al-Adha" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Days Until Hanukkah

How many days until Hanukkah? A live countdown to the first day of Hanukkah (25 Kislev), with first-candle evenings and end dates for coming years. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/days-until-hanukkah/" title="Days Until Hanukkah" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Days Until Chinese New Year

How many days until Chinese New Year? A live countdown to Lunar New Year with verified dates and zodiac animals from the Hong Kong Observatory through 2036. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/days-until-chinese-new-year/" title="Days Until Chinese New Year" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Days Until Diwali

How many days until Diwali? A live countdown to Lakshmi Puja, the main day of the festival of lights, with verified Diwali dates through 2036. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/days-until-diwali/" title="Days Until Diwali" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Everyday

CM to Inches Converter

Convert centimeters to inches or inches to centimeters instantly. Shows feet and inches, the nearest 1/16 inch and a height chart from 150 to 200 cm. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/cm-to-inches/" title="CM to Inches Converter" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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KG to LBS Converter

Convert kilograms to pounds or pounds to kilograms with the exact factor 1 lb = 0.45359237 kg. Shows pounds and ounces, stones and pounds, and a kg-to-lb chart. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/kg-to-lbs/" title="KG to LBS Converter" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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MM to Inches Converter

Convert millimeters to inches (and back) with the nearest 1/16, 1/32 and 1/64 inch fraction and its error in mm. Charts of 1–25 mm and common sizes. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/mm-to-inches/" title="MM to Inches Converter" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Celsius to Fahrenheit Converter

Convert Celsius to Fahrenheit or Fahrenheit to Celsius with the exact formula, plus Kelvin. Weather, oven and body-temperature charts and a mental shortcut. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/celsius-to-fahrenheit/" title="Celsius to Fahrenheit Converter" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Chinese Zodiac Calculator

Find your Chinese zodiac animal, element and yin or yang from your birth date, using Chinese New Year dates from the Hong Kong Observatory. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/chinese-zodiac-calculator/" title="Chinese Zodiac Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
<p>Calculator by <a href="https://calcworthy.com/">CalcWorthy</a></p>
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Dog Age Calculator

Convert your dog’s age to human years with the AKC size chart and the UC San Diego DNA methylation formula, side by side, with sources and limits. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/dog-age-calculator/" title="Dog Age Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Turkey Thawing Time Calculator

When should you start thawing your turkey? Get USDA thawing times for the fridge, cold water or microwave, the exact start date and roasting times by weight. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/turkey-thawing-time-calculator/" title="Turkey Thawing Time Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Space Heater Cost Calculator

How much does a space heater cost to run? Enter the wattage, hours and your electricity price to see the cost per hour, day, month and winter season. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/space-heater-cost-calculator/" title="Space Heater Cost Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Electricity Cost Calculator

Find what any appliance costs to run from its watts and hours of use, or its yearly kWh. Daily, monthly and yearly cost plus typical appliance wattages. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/electricity-cost-calculator/" title="Electricity Cost Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Unit Converter

Convert cm to inches, kg to lbs, °C to °F, liters to gallons, m² to square feet and km/h to mph. Exact factors, every unit shown at once. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/unit-converter/" title="Unit Converter" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Square Footage Calculator

Find the square footage of a rectangle, circle, triangle or L-shaped room, converted to square yards, square meters and acres, with a cost estimate. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/square-footage-calculator/" title="Square Footage Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Concrete Calculator

Work out how much concrete a slab needs in cubic yards and cubic feet, and how many 80-lb or 60-lb premix bags to buy, with a waste allowance. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/concrete-calculator/" title="Concrete Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Gas Cost Calculator

Estimate the fuel cost of a road trip from distance, MPG and gas price. Includes round trips, gallons used, cost per mile and splitting the cost. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/gas-cost-calculator/" title="Gas Cost Calculator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Word Counter

Count words, characters with and without spaces, sentences and paragraphs as you type, plus reading and speaking time. Your text stays in your browser. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/word-counter/" title="Word Counter" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Password Generator

Generate strong random passwords from 8 to 128 characters with letters, numbers and symbols. Created in your browser and never sent anywhere. Open the full calculator · Preview the widget

<iframe src="https://calcworthy.com/embed/password-generator/" title="Password Generator" loading="lazy" style="width:100%;max-width:760px;height:820px;border:0"></iframe>
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Questions

Is it really free?

Yes, for personal, commercial, school and non-profit sites alike. There is no usage limit.

Can I change the colors or the default values?

Not yet. If you need a specific version — different defaults, a local currency or a language — tell us; most calculators are also available in 23 other languages from each language's own calculator pages.

Will the widget slow down my site?

No. It loads only when a reader scrolls near it, and it doesn't load any advertising or tracking scripts.