Pregnancy Due Date Calculator

Estimate your due date, gestational age, and pregnancy milestones.

Last Menstrual Period

Cycle Length (days)

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How it works

This calculator uses Naegele's rule: add 280 days to the first day of your last menstrual period (LMP). If your cycle is longer or shorter than 28 days, the due date is adjusted accordingly. Gestational age counts from LMP, not from conception.

Calculate Due Date: When Is My Baby Coming? →

Calculate your due date using Naegele's rule. Pregnancy weeks, trimesters, milestones and why only 4% of babies arrive on the estimated date.