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Home/Fitness & Health/Ovulation Calculator

Ovulation Calculator

Estimate ovulation date for conception

calculators.ovulation.lastMenstrualPeriod

calculators.ovulation.cycleLength

Fitness & Health

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Written by the EachTools Team

Last updated: January 2026

How Ovulation Is Predicted

Ovulation typically occurs 14 days before the next menstrual period. This calculator estimates your fertile window based on your cycle length.

Steps

Enter the start date of your last period.
Input your average cycle length.
View estimated ovulation date and fertile window.