Uses Naegele’s rule (LMP + 280 days) adjusted for your cycle length.
What is the Pregnancy Due Date Calculator?
This due date calculator estimates when your baby will arrive. It adds 280 days (40 weeks) to the first day of your last menstrual period and adjusts for longer or shorter cycles. It also shows how many weeks pregnant you are and your trimester.
How to use the Pregnancy Due Date Calculator
- Pick the first day of your last period.
- Enter your usual cycle length (28 days is average).
- See your estimated due date, week and trimester.
Frequently asked questions
How accurate is a due date?
Only about 4% of babies arrive exactly on the due date. Most are born within two weeks either side.
Can an ultrasound change my due date?
Yes. An early ultrasound is often more accurate, so follow your doctor’s date.
This pregnancy due date calculator is 100% free, needs no signup and runs in your browser, so your data stays private.
Last updated: · By NodifyTech