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Ovulation Calculator

Track your ovulation, fertile window and next period.

✓ FreeNo signupWorks in browser

First day of last period

Cycle length (days)

This is an estimate. Actual ovulation varies. Consult a doctor for family planning.

About this tool

Ovulation Calculator — Track your ovulation, fertile window and next period. This tool runs entirely in your browser. No data is sent to any server. Free to use, no account required.