Due Date Calculator
Find out when your baby is expected to arrive
How is my due date calculated?
We use Naegele's rule, the same method your doctor or midwife uses. It works by adding 280 days (40 weeks) to the first day of your last menstrual period. This assumes a 28-day cycle with ovulation on day 14. It's been the standard for over 200 years because it's simple and surprisingly accurate for most pregnancies.
How accurate is this?
Here's the truth: only about 5% of babies arrive on their exact due date. Most babies are born within a two-week window around the estimated date — anywhere from 38 to 42 weeks is considered full term. Think of your due date as a helpful guide rather than a firm appointment. Your healthcare provider may adjust the date after an early ultrasound, which can be even more precise.
What's next?
Now that you know your estimated due date, explore what's happening at each stage of your pregnancy. Our week-by-week guide covers everything from baby's development to what you're feeling, with practical tips for both moms and dads.
Start with Week 1