Pregnancy Due Date Calculator

Free pregnancy due date calculator. Estimate your baby's due date based on last period or conception date. Track pregnancy milestones.

Calculate your estimated due date based on the first day of your last menstrual period or your conception date. See how far along you are and track your pregnancy journey.

Common use cases

  • Expectant parents calculating due dates
  • Tracking pregnancy progression
  • Planning maternity leave timing
  • Scheduling prenatal appointments
  • Sharing due date with family and friends

How to use

  1. Enter the first day of your last period, OR
  2. Enter your known or estimated conception date
  3. View your estimated due date
  4. See your current week of pregnancy
  5. Track upcoming pregnancy milestones

FAQ

How is the due date calculated?

From last period: 40 weeks (280 days) from the first day. From conception: 38 weeks (266 days) from conception date.

How accurate is this estimate?

Only about 5% of babies arrive on their due date. Most are born within 2 weeks before or after.

What if my cycle isn't 28 days?

Longer cycles may mean a later due date. Your healthcare provider can adjust based on ultrasound measurements.