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The IVF Fertility Blog

How To Properly Use a Fertility Calculator To Calculate Due Date

Getting pregnant while trying to conceive is all about timing. Use a fertility calculator in order to determine your most fertile periods and calculate your due date.

2015-15How do fertility calculators work?

Although every woman’s cycle is different, their cycles follow a similar pattern.  Women typically ovulate 14 days before the start of their next period.  For instance, if a woman has a 30 day cycle she will ovulate on day 16.  A woman with a 28 day cycle will ovulate on day 14.  By providing information such as the dates of your last cycle, fertility calculators take the guess work out of identifying your most fertile periods.   Additionally, the fertility calculator can provide your estimated due date based on the start of your last monthly period. 

How do I use a fertility calculator?

There is some key information that is required to use a fertility calculator.  You will need:

  • The start date and end date of your last menstrual cycle
  • The average number of days of your menstrual cycles
  • The first date of your last period

Some calculators will request that you provide the start date and end date of several cycles in order to calculate an average duration.  The output of the calculations can include:

  • The window of time where you are most likely to conceive
  • Days where you are not fertile
  • The expected date of your next period
  • Your expected due date should you get pregnant during the cycle
How are due dates calculated?

There are several ways of calculating a due date.  Most women do not know exactly when they conceived.  In these cases, fertility calculators use the date of the last monthly period and add 280 days.  This method assumes that a woman’s cycle is 28 days long which is not always accurate, but typically is within 2 weeks of the due date.

If a woman knows the date of conception due to fertility treatment or timed intercourse, the due date is calculated by adding 266 days to the day of conception.

For additional information on timing intercourse and how to use a fertility calculator to increase your chance of getting pregnant, contact New Hope Fertility Center today.  Please click the link below to enter your information and New Hope will contact you, or simply call 212-517-7676. Thank You.


Schedule Your Consultation With New Hope Fertility


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