Free Due Date Calculator
Calculate your estimated due date, see what week you're in, and plan your doula support timeline — all for free.
Don't know your LMP? Ask your healthcare provider or check your period tracking app.
Frequently Asked Questions
How is my due date calculated?
Due dates are typically calculated using Naegele's rule: add 280 days (40 weeks) to the first day of your last menstrual period (LMP). This is an estimate — only about 5% of babies are born on their due date.
How accurate is a due date calculator?
Due date calculators based on LMP are accurate within about 2 weeks. An early ultrasound (8-12 weeks) can provide a more precise estimate. Your healthcare provider may adjust your due date based on ultrasound measurements.
What trimester am I in?
The first trimester spans weeks 1-12, the second trimester weeks 13-27, and the third trimester weeks 28-40. Each trimester brings different developmental milestones and changes for both baby and parent.
When should I hire a doula?
Most doulas recommend hiring by 20-28 weeks of pregnancy. This gives you time for prenatal visits, birth plan development, and building a trusting relationship before labor. Popular doulas book up fast — earlier is better.