Online Tools > Ovulation Calculator

Identify Your Most Fertile Days to Help Get Pregnant Sooner

You can take the guesswork out of trying to get pregnant. When you identify the days you will ovulate, you've found the days you're most likely to conceive! Use our Ovulation Calculator below to determine the days you are likely to be most fertile. Then increase your chances further by predicting the two days you're most likely to become pregnant with the FIRST RESPONSE® Easy-Read Ovulation Test. Simply use the ovulation calculator as a guide to determine when to start testing with the FIRST RESPONSE® Easy-Read Ovulation Test. It's over 99% accurate in predicting the two days you are most likely to conceive.




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Enter the first day of your last period.        


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Enter the average number of days in your cycle. Start with the first day of one period and count right up to the day before the first day of your next period. Count the first day of bleeding or spotting as day 1. The length of your cycle could be anywhere from 20 to 45 days.

The average cycle length is 28 days. If yours is shorter or longer, adjust the number below.

Your cycle length  days


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Click submit.

Please note: These dates are approximate. They 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 regularly occurring menstrual cycle. If your menstrual cycle is irregular, you may have more difficulty predicting your day of ovulation based on the calendar alone.