Due Date Calculator

Calculate Your Pregnancy Due Date

Calculate your pregnancy due date based on last menstrual period. Get trimester information and weeks pregnant.

How is the due date calculated?

The due date is calculated as 280 days (40 weeks) from the first day of your last menstrual period, using Naegeles rule.

Is the due date always accurate?

The due date is an estimate. Only about 5% of babies are born exactly on the due date. Most arrive within 2 weeks before or after.