Due Date Calculator

Calculate your pregnancy due date.

Calculate Due Date

First Day of Last Period

Average Cycle Length (days)

This is an estimate. Your doctor will provide the official due date.

Enter your last period date to calculate due date

This calculator estimates your baby's due date based on your last menstrual period (LMP).

Enter the first day of your last period. The standard pregnancy duration is calculated as 280 days (40 weeks).

This calculator uses standard formulas. Consult a specialist for precise results.

Only about 5% of babies are born on their exact due date. Most are born within two weeks before or after.