First day of one period to the first day of the next.
Days from ovulation to your next period. Leave at 14 if you don’t know it.
Next ovulation (estimated)Tuesday, October 13, 2026
Fertile windowOct 8 – Oct 14
Next period (estimated)Tuesday, October 27, 2026
Fertile window startsThursday, October 8, 2026
Fertile window endsWednesday, October 14, 2026
Most fertile daysOct 11 – Oct 13
Home pregnancy test fromTuesday, October 27, 2026

Ovulation ≈ 28 − 14 = 14 days after your period starts, about 14 days before the next one. Calendar estimates can be off by several days — this is not a method of birth control.

Your next 6 cycles
Period startsFertile windowOvulationNext period
Sep 29, 2026Oct 8 – Oct 14Oct 13, 2026Oct 27, 2026
Oct 27, 2026Nov 5 – Nov 11Nov 10, 2026Nov 24, 2026
Nov 24, 2026Dec 3 – Dec 9Dec 8, 2026Dec 22, 2026
Dec 22, 2026Dec 31 – Jan 6Jan 5, 2027Jan 19, 2027
Jan 19, 2027Jan 28 – Feb 3Feb 2, 2027Feb 16, 2027
Feb 16, 2027Feb 25 – Mar 3Mar 2, 2027Mar 16, 2027

Ovulation Calculator · free calculator by CalcWorthy