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Ovulation Calculator
Estimate your ovulation date, fertile window and next period from your last period and average cycle length.
How to use this tool
- 1Paste or type your input above.
- 2The result updates instantly.
- 3Copy the output with one click.
Frequently asked questions
When is the fertile window?+
Roughly the 5 days before ovulation plus ovulation day itself β sperm survive up to 5 days, the egg about 24 hours. Ovulation typically occurs ~14 days before the next period.
Is my data private?+
Yes. The tool runs entirely in your browser β nothing you paste or type is uploaded to a server.
Learn more
- Ovulation Calculator: how it works
- ovulation calculator tips
- Ovulation Calculator FAQs