Pregnancy Due Date Calculator

Our pregnancy due date calculator form calculates the conception date and the expected delivery date based on the first day of your last menstrual period. This is how most health care providers calculate your due date. Once you have set a date, all values will be automatically updated after calculation.

your due date is only an estimation

Generally, a normal pregnancy can last about 40 weeks (or 38 weeks from conception). Your due date is calculated by adding 280 days (40 weeks) to the first day of your last period (LMP), considering a cycle length of 28 days.

Note that the dates below are approximate calculations, the real date may be slightly different. Only about 5% of births actually take place exactly on the expected due date, most babies are born a week or two before or after.