ovulation calculator

FIND YOUR BEST DATES
TO CONCEIVE

Trying to get pregnant? Our Ovulation Calculator helps you determine the days you're most likely to conceive. If you're actively trying to get pregnant, knowing when you will ovulate will greatly enhance your chance of success!

Our Ovulation Calculator will help you predict the dates you're most likely to ovulate based on your cycle length. Use this calculator as your guide for when to start testing with The First Response Easy Read Ovulation Test, which is over 99% accurate in predicting the 2 days you're most likely to become pregnant.

Enter the day of your last period and the number of days in your cycle (anywhere from 20 to 45 days). Our Ovulation Calculator will tell you the 2 days you're most likely to conceive.

WHAT WAS THE FIRST DATE OF YOUR LAST MENSTRUAL PEIOD?

HOW MANY DAYS ARE THERE IN YOUR CYCLE?

How does this tool calculate my most fertile days?

Your most fertile days are based on an estimate of your ovulation date, which occurs 14 days before the first day of your next period. If you know your "cycle length" (the number of days starting from the first day of one period to the day before the first day of the next), you can predict when your next period will begin. To arrive at your ovulation date, the First Response Ovulation Calculator counts backwards 14 days from the day before you expect your next period to start. Your most fertile days are a range of days around your estimated ovulation date. An unfertilized egg has a survival window of approximately 24 hours. Sperm can live longer and may already be present before an egg is released. Or sperm may arrive in the 24 hours after the egg has been released. This span of time accounts for the range in fertile days.

How does this tool calculate my due date?1

It first determines one estimated date of conception by counting backwards 14 days from the day before you expect your next period to start. This is the day ovulation most likely occurred and your estimated date of conception. Then, using your estimated date of conception and counting forward 38 weeks, your approximate due date is determined.

1 Only your physician can accurately determine your due date or date of conception, based on his/her knowledge of your complete medical condition.

Please note: These dates are approximate and are best used as a guideline for when to begin testing with the First Response Easy Read Ovulation Test. Additionally, these dates are based on a regular menstrual cycle. If your menstrual cycle is irregular, you may have more difficulty pinpointing your day of ovulation based on the calendar alone. With our Daily Ovulation test, you can test daily for 20 consecutive days from the day after your period ends.

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