First Date of Last Mentrual Cycle
(mm/dd/yyyy)

Baby’s Approximate Due Date

*Uses a typical 40 week pregnancy (please note only about 1 in 50 pregnancies actually land on the due date).

Conception Date Calculator

Please note when using our gestation calculator, the baby’s due date is approximately 40 weeks from the first day of your last menstural period. The gestation period is 280 days from this date. Some babies are born before this date and some are after. It is only an approximation. Please seek professional advice on your baby and your own health if you suspect you are pregnant. Expectant Mothers/Expecting Mothers should be very diligent in following their doctor’s pregnancy advice.

Gestation Period for a Human Baby/Gestation Period for Women

The Gestation Period for a Human is approximately 280 days from the first day of the last menstrual period. It is common for male fetuses to gestate several days longer than for a female fetus. The ethnicity of the baby may also contribute to a longer gestation period or even shorten the gestation period. The gestation period calculator above attempts to generalize the estimation of the due date without any additional factors. Sometimes called a Conception Date Calculator used to determine the due date after a female woman has been impregnated.

Female Gestation Calculator/Conception Date Calculator

Pregnancy Gestation Calculator/Calendar