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Ovulation calculator

Use our handy tool to work out when you are most likely to ovulate

The maths behind your ovulation

Are you trying for a baby? Getting pregnant isn't always as straightforward as it sounds, so increase your chances by finding out when you're most likely to ovulate using our ovulation calculator.

When am I ovulating?

Forget complicated charts, just select the first day of your last menstrual period. Then, tell us:

  1. The average length of your cycle
  2. The average length of your ‘luteal phase.' This means the part of your cycle which starts at ovulation and ends the day before your next period. If you are unsure, just leave it as 14 days.

The ovulation calculator will then tell you which days you're at your most fertile, including the date ’most likely’ for you to conceive.

Please bear in mind that these are just estimates, based on a regular menstrual cycle. If your cycle is irregular the ovulation calculator may not be the most accurate way to work out when you are ovulating.

Ovulation calculator