Ovulation Calculator
Estimate ovulation day, fertile window and next expected period from your last period date and average cycle length. Runs in your browser.
Runs in your browser — your file never leaves your deviceFrequently asked questions
Is Ovulation Calculator free to use?
Yes — Ovulation Calculator is completely free with no limits, no watermarks and no sign-up. It runs in your browser, so there is nothing to pay for.
Are my files uploaded or stored anywhere?
No. This tool does all its work locally in your browser using your own device's power. Your files never leave your device and we never see them.
Do I need to install anything or create an account?
No installation and no account needed. Ovulation Calculator works on any modern browser — Windows, Mac, Linux, Android and iPhone.
How do I use Ovulation Calculator?
Open the tool, add your file (or paste your content), adjust any options, then press “Estimate ovulation”. Your result is ready to download in seconds.
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