How to find our your most fertile days with this most precise Ovulation and Fertility Calculator and Calendar

babyMed has the most accurate ovulation calculator to determine your fertile window according to published research. Most other sites calculate your fertile days and ovulation incorrectly. Women who know when they ovulate and when they are most fertile have a higher chance of getting pregnant during that cycle.

This calculator was developed by an ObGyn Doctor

The most accurate babyMed proprietary formula was developed by a real doctor to help you calculate your fertile days to improve your chances of getting pregnant (or not). The babyMed ovulation and fertility calculator (and calendar) calculates your most fertile days to have sex, and it will also help you predict the precise day you will ovulate. It will also calculate the implantation day, when to expect the first pregnancy signs and symptoms, and when your pregnancy test could become positive. In addition, it will tell you the days you are less fertile, and less likely to get pregnant.

How can I improve my chances of getting pregnant?

If you want to improve your chances of getting pregnant, you need to answer one simple question: "When do I ovulate and when are my fertile days?" Knowing exactly if and when you ovulate is the single most important information you need to know when trying to get pregnant (in addition to knowing that your partner has a healthy sperm count).  You can only get pregnant from having sex on your fertile days, which are the 4-5 days before and the day of ovulation. If you know when you ovulate, you can also time sex better.

How To use the Ovulation and Fertility Calculator and Calendar

You first enter the first day of your last menstrual period (first day of bleeding). You then enter the average length of your menstrual cycles (average is usually around 28-29 days). If you don't know the exact length of your menstrual cycle or luteal phase, you can leave these at their default values (menstrual cycle: 28 days, luteal phase: 14 days). However, it is recommended that you try to record your own cycle lengths if possible because that will help you to more accurately predict your likely date of ovulation.

What is the Fertility Window?

The "Fertility Window" consists of the 5-6 days during the menstrual cycle during which intercourse is most likely to result in pregnancy. You can get pregnant during these days, and your chances of getting pregnant increase the closer you have sex to the day of ovulation.  This fertile window extends runs for 6 days starting at 5 days before ovulation until the day of ovulation. Your most fertile days are the 4-5 days before and the day of ovulation.

Can I get pregnant if I am having sex after ovulation?

Making love the day after established ovulation is unlikely to improve your chances of getting pregnant. The egg lives only for 12-24 hours and sperm must be around when ovulation happens to improve fertilization and pregnancy. Increasing amounts of estrogen in the cervical mucus and reproductive tract of a women approaching ovulation generally allows the sperm to live for up to 6 days.

Does ovulation always happen on the exact day of calculated ovulation?

Studies have shown that even in women with regular cycles, ovulation can possibly happen any time, so "timing" of intercourse has never been shown to improve your pregnancy chances. You are probably not improving your chances of getting pregnant if you wait with intercourse until the temperature goes up or the OPK has become positive. You may already have ovulated by that time, and sex after ovulation is unlikely to get you pregnant.

In addition, you may improve your chances if you have sex once a day (as long as his sperm are OK) during the fertile 4-5 days prior to, and the day of, ovulation. In those rare circumstances when the man does not have enough sperm (oligospermia), the old rule of once every other day still holds true. 

  • Sex every day: 37% chance of pregnancy
  • Sex every other day: 33%  chance of pregnancy
  • Sex once a week: 15%  chance of pregnancy

From: "Timing of Sexual Intercourse in Relation to Ovulation -- Effects on the Probability of Conception, Survival of the Pregnancy, and Sex of the Baby." Published in The New England Journal of Medicine (December 7, 1995 -- Vol. 333, No. 23). Allen J. Wilcox, Clarice R. Weinberg, Donna D. Bair

From: "Timing of Sexual Intercourse in Relation to Ovulation -- Effects on the Probability of Conception, Survival of the Pregnancy, and Sex of the Baby." Published in The New England Journal of Medicine (December 7, 1995 -- Vol. 333, No. 23). Allen J. Wilcox, Clarice R. Weinberg, Donna D. Bair

How can we improve our chances to have a girl or a boy?

In addition to calculating your fertile days, this calculator also helps you improve your chances of having a girl or a boy by choosing either girl or boy or by default girl/boy in the drop-down menu. Following our recommendations could improve your chances of having one or the other, though it's not 100% sure.

If you're already pregnant, check out our due date calculator to find out when your baby is due!

Read More:
10 Best Tips To Get Pregnant Faster!