Ovulation Calculator

Find your most fertile days and plan with confidence.

First day of your last period

Average cycle length

28 days

Most cycles are between 21 and 35 days. The average is 28.

How does ovulation tracking work?

Ovulation typically happens about 14 days before your next period starts. This calculator uses your cycle length and last period date to estimate when you are most likely to ovulate.

Your fertile window includes the 5 days before ovulation and the day of ovulation itself. Sperm can survive up to 5 days, so the days leading up to ovulation are just as important.

For the most accurate tracking, consider combining this calculator with other signs like basal body temperature and cervical mucus changes.

This calculator provides estimates based on average cycle patterns. Every body is different. If you have irregular cycles or are trying to conceive, speak with your GP or a fertility specialist for personalised guidance.

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