Ovulation Calculator

This ovulation and fertility calculator can help you find your fertile window and predict your ovulation date.

How your fertile days are calculated

The Ovulation Calculator estimates when you'll ovulate by counting back 14 days from the day you expect your next period. (If your cycle is 28 days long, your next period should start 28 days from the first day of your last period.)

Your fertile window includes the day you ovulate and the five days before, but keep in mind that you're much more likely to get pregnant during the last three days of this time frame.

See other ways to pinpoint your fertile days and increase your chances of becoming pregnant. Find out how to use an ovulation predictor kit, chart your basal body temperature, and pay attention to changes in cervical mucus.

Signs of ovulation

  • Rise in basal body temperature
  • Cervical mucus is the texture of egg whites
  • Breast tenderness
  • Mild cramps or twinges in the abdomen
  • Very mild spotting
  • Heightened sense of smell
  • Increased sex drive
  • Changes in appetite or mood
  • Bloating

Tips for getting pregnant

  • Find out when you'll ovulate using our calculator or an ovulation predictor kit, or by tracking your symptoms.
  • Have sex every other day around the time of ovulation.
  • Start taking a prenatal vitamin with folic acid at least one month before you start trying (6 months is ideal).
  • See your healthcare provider and make sure they're managing any pre-existing health conditions you may have. Staying up-to-date with vaccinations and regular check-ups and testing can lower the risk of complications during pregnancy.
  • Take good care of yourself. You'll want to kick unhealthy habits like smoking and start incorporating regular exercise into your routine if you aren't exercising already. Eating a healthy, nutrient-dense diet can help, too.

BabyCenter's editorial team is committed to providing the most helpful and trustworthy pregnancy and parenting information in the world. When creating and updating content, we rely on credible sources: respected health organizations, professional groups of doctors and other experts, and published studies in peer-reviewed journals. We believe you should always know the source of the information you're seeing. Learn more about our editorial and medical review policies.

ACOG. 2019. Fertility awareness-based methods of family planning. American College of Obstetricians and Gynecologists. a new window [Accessed July 2022]

ACOG. 2020. Good Health Before Pregnancy: Pre-pregnancy Care a new window [Accessed July 2022]

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