Pregnancy Due Date Calculator

The best due date calculator online.

Estimate your due date by LMP, ultrasound, or IVF transfer—following ACOG redating guidance.

Calculate your due date

Answer a few questions below. Your data stays in your browser.

Is this an IVF pregnancy?

No Yes

Last menstrual period unknown or cycles irregular

First Day of Last Period

No ultrasound performed

Date First Ultrasound Was Performed

Gestational Age at Ultrasound (based on fetal measurements at that scan)

This calculator is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.