Pregnancy Due Date Calculator

What is Pregnancy Due Date Calculator?

Pregnancy Due Date Calculator estimates your expected delivery date based on the first day of your last menstrual period. It uses Naegele's rule (adding 280 days) to calculate your due date and show trimester milestones.

How to use

1. Step 1 — Enter the first day of your last menstrual period using the date picker.
2. Step 2 — The calculator instantly shows your estimated due date and current week of pregnancy.
3. Step 3 — View key trimester dates and a week-by-week progress indicator.

Result

Your last period started on January 15, 2026. The calculator estimates your due date as October 22, 2026 and shows you are currently in week 8 of your first trimester.

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