Pregnancy Due Date Calculator

Find out when your baby is due and track your pregnancy milestones.

Estimate your baby's due date based on your last period or conception date.

Calculation Method

First Day of Last Period

Average Cycle Length (Days)

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Calculation Methods

Last Menstrual Period (LMP): Most pregnancies are calculated from the first day of your last period. The standard rule (Naegele's Rule) adds 280 days (40 weeks) to this date.

Conception Date: If you know the exact date of conception, the due date is calculated by adding 266 days (38 weeks).

Pregnancy Trimesters

First Trimester: Weeks 1-12. The baby's body structure and organ systems develop.
Second Trimester: Weeks 13-26. You may feel the baby move. The sex can often be determined.
Third Trimester: Weeks 27-40. The baby grows in size and weight, preparing for birth.