Ovulation Calculator
Predict your ovulation day and 6-day fertile window to plan or avoid pregnancy more naturally.
Result
What is the Ovulation Calculator?
Ovulation usually happens about fourteen days before your next period. Enter the first day of your last period and your average cycle length, and this calculator predicts your ovulation date, the six-day fertile window around it, your next period and your current cycle day.
Results are based on the average cycle and are not a reliable method of contraception — use them to understand your cycle and to plan, and confirm with a doctor if you are trying to conceive.
How to use the Ovulation Calculator
- Enter your content in the input box above.
- Adjust any extra options if needed.
- Click Run Tool and your result appears instantly.
- Copy or download the output — it never leaves your device.
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