Ovulation Calculator
Estimate your most fertile days and ovulation date.
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About this tool
About Ovulation Calculator
Ovulation Calculator is a free, browser-based tool that lets you estimate your most fertile days and ovulation date. It supports Date → Date. Everything runs locally on your device, so your files are never uploaded to a server. There's no sign-up, no watermark, and no limit — just open Ovulation Calculator, add your input, and get results instantly.
How to use Ovulation Calculator
1
Enter LMP date
Select the first day of your last period.
2
Set cycle length
Input your typical menstrual cycle length.
3
View fertile window
Instantly identify your peak fertility days and next period.
Key features
Fertility Window
Identifies your peak fertile days to help with family planning.
Next Period Estimate
Predicts when your next menstrual cycle is likely to begin.
100% Private
Ovulation Calculator processes your data locally in the browser. Nothing is uploaded, tracked, or stored — your files never leave your device.
Completely Free
Use Ovulation Calculator as much as you want with no fees, no watermarks, and no hidden limits.
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