Ovulation calculator
For trying to conceive or getting to know your cycle. Nothing is sent or stored.
Everything happens in your browser: your files are never uploaded to a server.
An estimate for regular cycles. Not a birth control method or medical advice.
How to use it
- Enter the first day of your last period.
- Enter your cycle length in days.
- See ovulation and the fertile window.
FAQ
Is it reliable as contraception?
No. It is an estimate for regular cycles and is not a birth control method.
How is it calculated?
Ovulation usually happens 14 days before the next period; the fertile window runs from 5 days before to 1 day after.
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