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Due Date Calculator

Use our calculator to estimate your baby's due date.

Enter the first day of your last period and how long your cycle normally lasts (the number of days beginning with the first day of your last menstrual period [first day of bleeding] up to and including the day before your next period). The average cycle is 28 days.

When was the first day of your last menstrual period?

Cycle Length:


How is my due date calculated?

The start of your pregnancy is calculated from the first day of your last menstrual period. Given this method of calculation, your pregnancy is measured in what is termed gestational weeks, as opposed to being measured from the actual day of conception.

Counting from the first day of your last menstrual period, there are 40 gestational weeks of pregnancy.

Please be aware that few babies are delivered on their exact due date, so these results are an estimate only. Be sure to consult your healthcare professional for more information and to determine your due date.

This calculator is most likely to be accurate if your periods are regular.