Pregnancy due date calculator

Due Date Calculator

When will your child be born? You can determine your due date using our pregnancy calculator based on the dates of your last menstrual period (LMP), fertilization, IVF 3- or 5-day transfer, or your most recent scan.
Calculation Method
The first day of your last period
Cycle Length
Calculate my due date

Last menstrual period (LMP)

In general, the most accurate way to determine your due date is to calculate 40 weeks, or 280 days, from the first day of your last menstrual period because most pregnancies last around 40 weeks (or 38 weeks from conception) (LMP).
You might also add seven days and three months to the start of your most recent cycle.


Date of conception

Your pregnant due date may be determined using your conception date if you’ve been keeping track of ovulation symptoms or utilizing ovulation test strips.
To determine your anticipated due date, simply add 266 days.


Date of IVF transfer

You can use the date of your IVF transfer to determine your due date if you became pregnant through IVF. Most embryo transfers happen three to five days after the egg is removed and fertilized. To determine your due date if you had a day-three transfer, add 263 days to the transfer date; if you had a day-five transfer, add 261 days.


Ultrasound scan

Ultrasound imaging is used for the examination of a developing fetus in pregnant women. Sound waves produce pictures of your unborn baby depending on how far along your pregnancy is.