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Ovulation Calculator

See when you’re likely to ovulate, which days you’re most fertile, and when your next period is due.

Day one is the first day of bleeding.

More options

Most people have a luteal phase of about 14 days. Change it only if you know yours.

Enter the first day of your last period to see your fertile window.

Predictions assume a regular cycle. Stress, illness, travel and breastfeeding can move ovulation, so for a more precise window combine this with ovulation test strips or basal body temperature.

This calculator is not a method of contraception and doesn’t replace medical advice. See a doctor if your cycles are very irregular or you’ve been trying to conceive for a year (six months if you’re over 35).

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Predict Your Fertile Window

Ovulation usually happens about 14 days before your next period, and you’re fertile for the five days before it and on the day itself. Enter the first day of your last period and your cycle length to see your window on a calendar.

What you can do

  • Ovulation date, fertile window and next period date for your next six cycles.
  • A colour-coded calendar: peak fertility, fertile days, ovulation and expected periods.
  • Tap any day to see your chance of conceiving on that day.
  • Adjust period length and luteal phase if you know yours.

Good to know

  • The most fertile days are the two days before ovulation and the day of ovulation.
  • Predictions assume a regular cycle. For more precision, combine them with ovulation test strips or basal body temperature.
  • This is not a form of birth control. Cycles vary, and ovulation can shift from month to month.

Frequently asked questions

How do I calculate my ovulation date?

Count your cycle length from the first day of your period and subtract about 14 days. In a 28-day cycle that is day 14.

When am I most fertile?

In the two days before ovulation and on the day itself. Sperm can survive up to five days, so the fertile window starts five days before ovulation.

Can I use this to avoid pregnancy?

No. It is not a reliable contraceptive, because ovulation varies. Use a proven method if you want to avoid pregnancy.

What if my cycle is irregular?

The predictions become less accurate. Ovulation test strips or tracking basal body temperature will help, and a doctor can advise you.

When should I take a pregnancy test?

From the day your period is due, or a day or two after, for the most reliable result.