Ovulation & Fertile Window Calculator

Estimate ovulation day and fertile days from your last period

First day of last period

Average cycle length (days)

Luteal phase (days, optional)

Estimated ovulation

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Fertile window

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For planning only — not medical advice. Cycle length varies; confirm with ovulation tests or a healthcare provider if trying to conceive.

Health

ovulation_calculator

Published

Severity: 8192

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Updated

2026-05-31 22:57:30

Author

Taylor Bennett