Health & Fitness Calculators
Pregnancy Calculator
Track your due date and pregnancy week.
FreeNo sign-upWorks in your browser
Based on a 280-day (40-week) pregnancy from the last period. Confirm dating with your provider.
Estimated due date
Sun, April 18, 2027
Current progress
0 weeks, 0 days
First trimester
Estimated conception
Sun, July 26, 2026
About the Pregnancy Calculator
Enter the first day of your last menstrual period and the calculator estimates your due date (40 weeks later), how many weeks and days along you are, your trimester, and the estimated conception date. It's the quick way to track a pregnancy's timeline — your provider's dating scan remains the authoritative source.
How to use the Pregnancy Calculator
- 1Enter your first day of your last period.
- 2Read the result instantly — it recalculates as you type.
- 3Adjust the numbers to model different scenarios.
Frequently asked questions
How is the due date calculated?
By adding 280 days (40 weeks) to the first day of your last menstrual period — the standard Naegele's rule estimate.
How accurate is it?
It's a solid estimate, but only about 5% of babies arrive exactly on the due date. An ultrasound refines the dating.