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Ovulation Calculator

Find your fertile days, your likely ovulation day and the best days to try for a baby, based on your own cycle.

From Dr Pallab Roy, obstetrician and gynaecologist in Kolkata
Your cycle
Count from the first day of one period to the day before the next one starts.

How your cycle works

This is an example 28-day cycle. Enter the first day of your last period above to see your own dates.

Cycle wheel
  • Period
  • Fertile
  • Best days
  • Ovulation
Fertile days
Ovulation day
Best days to conceive
Talk to Dr Pallab Roy

Improve your chances

  • Have sex every 1 to 2 days during your fertile window, rather than only on ovulation day.
  • Watch for signs of ovulation: clear, stretchy discharge like raw egg white, a mild ache on one side of the lower tummy, or a positive ovulation (LH) test kit.
  • Start folic acid now. Take 400 micrograms (0.4 mg) a day from at least a month before you conceive, unless your doctor advises a different dose.
  • Keep a healthy weight, eat a balanced diet and stay active. Being very underweight or overweight can upset ovulation.
  • Stop smoking, tobacco and alcohol, and keep caffeine to about 2 cups of coffee a day. This applies to your partner too.
  • Have a pre-pregnancy check-up for thyroid, haemoglobin, blood sugar, rubella immunity and thalassaemia carrier status.

When to see a doctor

See a gynaecologist if you have been trying for a year without success, or for 6 months if you are 35 or older. Get checked sooner if:

  • your cycles are shorter than 21 days, longer than 35 days, or very irregular
  • your periods have stopped, or are very heavy or painful
  • you have PCOS, endometriosis, a thyroid problem or a past pelvic infection
  • you have had two or more miscarriages
  • your partner has a known health or fertility concern
*This calculator gives an estimate based on your dates. Ovulation can shift from cycle to cycle, so your fertile days may differ. It is not a method of contraception and does not replace medical advice.