Free tool

Know your baby’s expected due date with confidence

Enter the first day of your last menstrual period (LMP) to estimate your expected due date using Naegele’s Rule. Track your pregnancy week-by-week, understand your baby’s development, and receive important milestone updates throughout your pregnancy.

Pregnancy Due Date Calculator

Based on Naegele’s Rule (LMP + 280 days)

First day of your last menstrual period (LMP)

Use the first day of your most recent menstrual period for the most accurate estimate.

Enter your LMP to view your estimated due date, current pregnancy week, current trimester, days remaining, baby development summary, upcoming milestones and a shareable pregnancy summary.

Journey begins

Week 1

Heartbeat usually detectable*

Week 6

First trimester complete

Week 13

Your pregnancy timeline

Once you enter your LMP, we’ll estimate your pregnancy week, expected due date, trimester, and important developmental milestones.

Reminder: Only around 5% of babies are born on their estimated due date. Most healthy pregnancies deliver between 37 and 42 weeks. This calculator provides an estimate and should not replace clinical assessment by a qualified obstetrician.