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Ovulation & Fertile Window Calculator
Estimate your ovulation day, fertile window and next period from your last period and cycle length, for the next three cycles.
Tip from Tink: The fertile window is the 5 days before ovulation plus ovulation day.
Ovulation day
Jan 15, 2026
Fertile window
Jan 10, 2026 – Jan 16, 2026
Next period
Jan 29, 2026
Next cycles
- Fertile Feb 7, 2026 – Feb 13, 2026, ovulation Feb 12, 2026
- Fertile Mar 7, 2026 – Mar 13, 2026, ovulation Mar 12, 2026
Not reliable for birth control.
This is an estimate, not medical advice.
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How to use the Ovulation & Fertile Window Calculator
- Enter the first day of your last period.
- Set your usual cycle length.
- See your fertile window for the next cycles.
Everything runs in your browser. Nothing you enter is uploaded.