Pregnancy Due Date Calculator

Estimate your due date, how many weeks and days pregnant you are, and your trimester from the first day of your last period or the conception date.

Result

The due date is 280 days (40 weeks) after the first day of the last menstrual period (Naegele's rule). Your ultrasound dating takes priority.

How it works

Due date = LMP + 280 days, adjusted for cycle length
From conception: + 266 days

Results are estimates for reference only. Please confirm important decisions with the relevant authority or a professional.