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Home β€Ί Ovulation calculator

Ovulation calculator

Enter the first day of your last period and your usual cycle length to estimate your most fertile days.

Free tool β€” for everyone

Ovulation calculator

Estimate based on a regular cycle. Irregular cycles make this estimate less precise. This tool does not replace medical follow-up and must never be used as a method of contraception β€” talk to your healthcare professional.

Give yourself every chance

Your cycle tracker, month after month
Prepare your body for pregnancy
Menus to support fertility
From the positive test: your pregnancy followed week by week
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✨ Free to download β€” on phone, tablet and computer.

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Good to know

How is ovulation estimated?

Ovulation usually happens about 14 days before your next period. For a 28-day cycle, that's around day 14; for a 32-day cycle, around day 18.

What is the fertile window?

These are the days when sex can lead to pregnancy: the 5 days before ovulation and the day of ovulation, because sperm can survive for a few days.

What if my cycles are irregular?

The calculation is then less precise. Ovulation tests, temperature charting and observing cervical mucus can help. Talk to your health professional if you've been trying to conceive for more than 12 months (or 6 months from age 35).

🀰Also tryPregnancy calculator

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And so much more…

All your tools gathered on one page β€” plus every section, from conception to age 5.

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