Due Date Calculator

Estimate your baby's due date and current pregnancy week using the first day of your last menstrual period. Free due date calculator.

cycle

Result

250

Breakdown

Weeks Pregnant
4.3
Trimester
1

Frequently Asked Questions

How is a due date calculated?▼
Most calculators use Naegele's rule: add 280 days (40 weeks) to the first day of your last menstrual period. Only about 5% of babies arrive on the exact date.
How accurate are due dates?▼
Due dates are estimates with a normal full-term window of 37-42 weeks. Ultrasound in the first trimester can refine the estimate.

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