Pregnancy Due Date Calculator

A pregnancy due date calculator estimates the day your baby is expected, known as the estimated date of delivery (EDD). It also tells you how far along you are, in weeks and days, which is how doctors describe pregnancy and plan scans and check-ups.

This calculator uses Naegele's rule from your last menstrual period, adjusted for your cycle length, or counts from a conception or IVF embryo transfer date. It shows your due date, how many weeks pregnant you are today, your trimester and days to go, and lists the dates of key milestones such as the anomaly scan and full term.

Pregnancy is counted from the first day of your last period, about two weeks before conception, and lasts 280 days, or 40 weeks, on average. This is Naegele's rule. For cycles longer or shorter than 28 days, the date moves by the difference, because ovulation happens later or earlier.

From a known conception date, the due date is 266 days later. After IVF it's 263 days after a day-3 transfer and 261 days after a day-5 transfer.