Ovulation Calculator
Estimate ovulation and the fertile window from the first day of the last period.
Estimated ovulation day
October 26, 2026
approximately 14 days before the next period
Fertile window estimateOctober 21, 2026 – October 27, 2026
Next period estimateNovember 9, 2026
Cycle length28 days
Ovulation can vary and this estimate is not a contraceptive method. Estimates for general guidance only — not medical advice. Check with a qualified healthcare professional for personal decisions.
About the Ovulation Calculator
Estimate ovulation and the fertile window from the first day of the last period.
It runs entirely in your browser — nothing you type is sent to a server — and the result updates as you edit the inputs. Estimates are for educational and informational purposes only; see ourdisclaimer.
Common searches
- fertility
- fertile days
- cycle
Related calculators
Period CalculatorEstimate the next period, period end, and fertile window from cycle history.Pregnancy Conception CalculatorEstimate conception timing from an estimated due date and average cycle length.Pregnancy CalculatorEstimate due date, current gestational age, and ovulation from the last period date.
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