Ovulation Calculator
Estimate your fertile window — the days you are most likely to conceive.
What is Ovulation?
Ovulation typically happens around 14 days before the next period. The fertile window covers about 5 days before and 1 day after ovulation.
How is it calculated?
Fertile window: (LMP + cycle − 19) to (LMP + cycle − 11).
Frequently Asked Questions
- How long does sperm survive?
- Up to 5 days in fertile cervical mucus, which is why the window starts before ovulation.