Enter the first day of your last period and your usual cycle length to get your estimated due date, how many weeks pregnant you are today and your trimester. It also shows the days left until the due date.
How to use it
- Pick the first day of your last period.
- Enter your usual cycle length (28 days if unsure).
- Read your due date, week of pregnancy and days left.
Questions about this tool
How is the due date worked out?
It counts 280 days (40 weeks) from the first day of your last period, adjusted if your cycle is shorter or longer than 28 days.
How accurate is it?
It is an estimate. Many babies arrive before or after it, and an early ultrasound can give a more reliable date, so follow your doctor's dating.