Pregnancy Due Date

When is your due date?

Based on the first day of your last period, using the standard 280-day (40-week) estimate.

First day of last period

This is a general estimate based on a standard 40-week pregnancy and doesn't account for individual variation. Your healthcare provider's estimate, especially one based on an ultrasound, is more accurate.

Frequently asked questions

How is the due date calculated?

We add 280 days (40 weeks) to the first day of your last menstrual period — the same method most standard pregnancy wheels and calculators use.

Is this accurate for everyone?

It's a general estimate. Cycle length and ovulation timing vary, so an ultrasound-based estimate from a healthcare provider is generally more precise.

General information only — not medical advice. For guidance about your pregnancy, speak with a qualified healthcare provider.