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Ovulation Calculator

Find your fertile window and predicted ovulation date.

Your cycle

First Day of Last Period

Average Cycle Length — 28 days

21 days40 days

Luteal Phase Length — 14 days

10 days17 days

Predicted Ovulation

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Fertile Window Start

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Fertile Window End

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Next Period

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💡 How it works

Ovulation typically occurs 14 days before your next period. Your fertile window spans the 5 days before ovulation plus ovulation day itself. These are estimates — track your cycle for more accuracy.