Estimate your ovulation day, fertile window and next period for the next three cycles.
What is the Ovulation Calculator?
Ovulation usually happens about 14 days before your next period. This calculator uses the first day of your last period and your cycle length to estimate your ovulation day, your most fertile days and your next period for the coming three cycles.
How to use the Ovulation Calculator
- Pick the first day of your last period.
- Enter your average cycle length.
- See your fertile window and ovulation dates.
Frequently asked questions
How long is the fertile window?
About 6 days: the 5 days before ovulation and the day of ovulation.
This ovulation calculator is 100% free, needs no signup and runs in your browser, so your data stays private.
Last updated: · By NodifyTech