Free online calculators that show their work
52 fast, accurate calculators for money, health, school and everyday life. Instant results, clear explanations, no sign-up.
Your calculators
Most popular
Mortgage CalculatorEstimate your monthly mortgage payment with property tax, insurance, PMI and HOA. See total interest and a full amortization schedule. Free and instant.Compound Interest CalculatorSee how savings grow with compound interest and monthly contributions. Pick daily, monthly, quarterly or annual compounding and view a year-by-year table.BMI CalculatorCalculate your body mass index in pounds or kilograms. See your CDC weight category, the healthy weight range for your height and your BMI Prime.Percentage CalculatorWork out any percentage: X% of Y, what percent one number is of another, percentage change, and increasing or decreasing by a percent. Steps shown.Age CalculatorFind 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.Calorie CalculatorEstimate how many calories you burn per day with the Mifflin-St Jeor equation, plus daily targets for gradual weight loss or weight gain.Loan CalculatorCalculate 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.Days Until ChristmasHow 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.
Finance Calculators
Mortgage CalculatorEstimate your monthly mortgage payment with property tax, insurance, PMI and HOA. See total interest and a full amortization schedule. Free and instant.Home Affordability CalculatorHow 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.Refinance CalculatorSee if refinancing your mortgage pays off: new monthly payment, monthly savings, break-even point on closing costs and lifetime interest savings.Amortization CalculatorBuild a full loan amortization schedule. See your payment, total interest and payoff date, and how much time and interest extra monthly payments save.Loan CalculatorCalculate 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.Auto Loan CalculatorEstimate your car payment with sales tax, fees, down payment and trade-in. See the amount financed, total interest, total cost and a term comparison.Credit Card Payoff CalculatorFind 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.Compound Interest CalculatorSee how savings grow with compound interest and monthly contributions. Pick daily, monthly, quarterly or annual compounding and view a year-by-year table.Savings Goal CalculatorFind 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.Retirement CalculatorProject your retirement savings from your age, savings and monthly contributions. See the total in today’s dollars and a 4% rule income estimate.401(k) CalculatorEstimate your 401(k) balance at retirement from your contributions, employer match, salary raises and investment growth. See exactly what the match adds.CD CalculatorCalculate the interest and ending balance of a certificate of deposit from the deposit, APY or rate, term and compounding. APY vs APR explained.Simple Interest CalculatorCalculate 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.ROI CalculatorCalculate return on investment (ROI) as a percentage, your gain or loss, and annualized ROI (CAGR) to compare investments held for different lengths.Budget CalculatorSplit 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.Salary to Hourly CalculatorConvert 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.
Business & Shopping Calculators
Profit Margin CalculatorFind 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.Markup CalculatorAdd a markup percentage to your cost to get the selling price, profit and resulting gross margin. Includes a markup-to-margin conversion table.Break-Even CalculatorFind 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.Sales Tax CalculatorAdd 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.Discount CalculatorCalculate the sale price and how much you save, including stacked discounts like 20% off plus an extra 10%. Shows the true combined discount.Tip CalculatorCalculate 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.
Health & Fitness Calculators
BMI CalculatorCalculate your body mass index in pounds or kilograms. See your CDC weight category, the healthy weight range for your height and your BMI Prime.Calorie CalculatorEstimate how many calories you burn per day with the Mifflin-St Jeor equation, plus daily targets for gradual weight loss or weight gain.Body Fat CalculatorEstimate your body fat percentage with the U.S. Navy circumference method using a tape measure. See your ACE category, fat mass and lean mass.Pregnancy Due Date CalculatorEstimate your due date from your last period, conception date or IVF transfer. See how far along you are, your trimester and key pregnancy milestones.Ovulation CalculatorEstimate 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.Ideal Weight CalculatorFind your ideal body weight with the Robinson, Miller, Devine and Hamwi formulas, side by side with the healthy BMI weight range for your height.
Math & School Calculators
Percentage CalculatorWork out any percentage: X% of Y, what percent one number is of another, percentage change, and increasing or decreasing by a percent. Steps shown.Fraction CalculatorAdd, subtract, multiply and divide fractions. Get the answer in lowest terms, as a mixed number and as a decimal, with every step shown.GPA CalculatorCalculate your GPA on the standard 4.0 scale from letter grades and credit hours. Add your previous GPA to get your new cumulative GPA.Final Grade CalculatorFind 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.Random Number GeneratorGenerate random whole numbers in any range, with or without duplicates and optionally sorted. Fair, unbiased and secure — runs in your browser.
Date & Time Calculators
Age CalculatorFind 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.Days Between Dates CalculatorCount the days between two dates, with weeks, months and years, business days (Monday to Friday) and an option to include the end date.Date Calculator — Add or Subtract DaysAdd 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.Hours CalculatorCalculate hours worked between two times minus unpaid breaks, as hours:minutes and decimal hours for timesheets, with pay. Overnight shifts handled.
Holiday Countdowns
Days Until ChristmasHow 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.Days Until HalloweenHow 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.Days Until ThanksgivingHow many days until Thanksgiving? Live countdown to U.S. Thanksgiving, the fourth Thursday of November, with dates for the next several years.Days Until Black FridayHow many days until Black Friday? A live countdown to the day after Thanksgiving, with Black Friday and Cyber Monday dates for the coming years.Days Until New YearHow 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.Days Until Valentine’s DayHow 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.Days Until EasterHow many days until Easter? A live countdown to Easter Sunday, with Western and Orthodox Easter dates and Ash Wednesday for the next several years.Days Until Mother’s DayHow 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.Days Until Father’s DayHow 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.Days Until the 4th of JulyHow 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.
Everyday Tools
Square Footage CalculatorFind the square footage of a rectangle, circle, triangle or L-shaped room, converted to square yards, square meters and acres, with a cost estimate.Concrete CalculatorWork 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.Gas Cost CalculatorEstimate 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.Word CounterCount words, characters with and without spaces, sentences and paragraphs as you type, plus reading and speaking time. Your text stays in your browser.Password GeneratorGenerate strong random passwords from 8 to 128 characters with letters, numbers and symbols. Created in your browser and never sent anywhere.
Tested formulas
Every calculator is checked against independently known results before each release, and the method is explained on the page.
Private by design
Calculations run in your browser. The numbers you type never leave your device.
Works offline
Install CalcWorthy as an app on your phone or computer and use the calculators you've opened even without a connection.