Calculate your pregnancy due date, see a trimester timeline, baby size comparisons, and key milestone dates.
What is Pregnancy Due Date Calculator?
Enter your last menstrual period, conception date, or known due date to instantly calculate your estimated due date, current week of pregnancy, and days remaining. Features a visual trimester timeline with animated progress, key milestone dates (first heartbeat, anatomy scan, viability, full term), a baby size comparison card showing fruit/vegetable comparisons for each week, and a grid of important dates throughout your pregnancy.
How to Use
Choose your input method: Last Menstrual Period (most common), Conception Date, or Known Due Date
Select the date using the date picker
See your estimated due date, current week, and days remaining
Scroll down for the trimester timeline, baby size comparison, and key milestone dates
Frequently Asked Questions
How is the due date calculated?
Using Naegele's rule: 280 days (40 weeks) from the first day of your last menstrual period (LMP). This is the standard method used by healthcare providers.
What if I know my conception date instead?
Switch to "Conception Date" mode. The calculator adds 266 days (38 weeks) from conception, which equals 280 days from the estimated LMP.
How accurate is this calculator?
Due dates are estimates. Only about 5% of babies are born on their exact due date. Most arrive within 2 weeks before or after. Your doctor may adjust based on ultrasound measurements.
What are the trimesters?
First trimester: weeks 1-12. Second trimester: weeks 13-26. Third trimester: weeks 27-40. Each has different developmental milestones.
Is my data stored?
No. All calculations happen entirely in your browser. We never send or store any personal health information.
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