Due Date Calculator

How is my due date calculated?

Use the form below to calculate your approximate due date

Date of last Menstrual Period :
Due Date Calculator

Use the form below to calculate your approximate due date

Date of last Menstrual Period :

First day of your last period

The most common way to calculate your due date is by counting 40 weeks from the first day of your last menstrual period (LMP). And that’s how most healthcare providers do it.

This method is based on the idea that women typically ovulate about 2 weeks after their period starts and pregnancy typically lasts about 38 weeks. Plus it’s usually easier to remember when your period started than to figure out what day you conceived.