Pregnancy Due Date Calculator
Estimate your pregnancy due date based on your last menstrual period (LMP).
Figuring Out When Baby's Coming
Doctors take the first day of your last period and add 280 days to it. That's where the "40 weeks" comes from that everyone talks about. Seems backwards since you weren't even pregnant on that day, but medical people have been doing it this way forever.
Why Even Bother With This?
Getting a rough date helps with the practical stuff. You can book your prenatal visits, figure out when to take time off work, and start getting ready for the baby without flying blind.
Plus it helps you follow along with what's happening during pregnancy - like when you might feel kicks, when certain tests happen, all that milestone stuff that makes it feel more real.
Don't Get Too Attached to the Date
Most babies don't actually arrive on their "due date." We're talking maybe 1 in 20 babies who show up exactly when predicted. The rest come anywhere from two weeks early to two weeks late, and that's totally normal.
First-time moms usually go past their due date. If you've had kids before, they often come a little sooner. Every pregnancy does its own thing.
Think of it more like a "due season" than a specific day. It gives you and your doctor a ballpark to work with, but don't make any firm plans expecting to still be pregnant on that exact date.
Your Doctor Knows Best
This basic calculation works for most people, but your OB might change your due date after doing ultrasounds or looking at other factors. Early ultrasounds can nail down timing pretty well, especially if your periods weren't regular or you can't remember when your last one started.
Bottom line - your baby will show up when they're good and ready, and Mother Nature usually knows what she's doing.