Ovulation Calculator
Find your fertile window, likely ovulation day and the next three periods.
- Runs in your browser
- No upload on server
- Free, forever
- Enter values
- See result
- Copy or share
Most fertile window
Wed, Oct 21 — Tue, Oct 27
Likely ovulation: Mon, Oct 26
Next three periods
- 1. Mon, Nov 9
- 2. Mon, Dec 7
- 3. Mon, Jan 4
How this works — and why it's private
- Enter the first day of your last period.
- Adjust cycle and luteal phase length if you know them — defaults work for most.
- See your fertile window, ovulation day and the next three periods.
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