Health

Pregnancy Due Date Calculator

Estimate your due date and current stage of pregnancy from the first day of your last period.

First day of your last menstrual period (LMP)

Average cycle length (days)

If your cycles run longer or shorter than 28 days, this adjusts the estimate slightly.

This due date is an estimate using a standard formula (Naegele's rule, adjusted for cycle length) — only a small share of babies are born exactly on their estimated due date, and a healthcare provider's dating via ultrasound is more accurate, especially with irregular cycles. This tool doesn't confirm or diagnose pregnancy. Please see a healthcare provider for prenatal care and an accurate assessment. Everything here is calculated locally in your browser.