Ovulation Calculator

Estimate your ovulation day and fertile window from your last period and cycle length.

First day of last period

Cycle length (days)

Estimated ovulation

—

Fertile window—

Next period—

Estimate only. Confirm with your healthcare provider.

✉ Email me this result

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How it works

Ovulation ≈ next period − 14 days

Frequently Asked Questions

How does the Ovulation Calculator work?

Estimate your ovulation day and fertile window from your last period and cycle length.

Is this medical advice?

No. It gives general estimates only. For decisions about your health, speak with a qualified professional.