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Pregnancy Calculator

Calculate important pregnancy dates and milestones

The Pregnancy Calculator can estimate a pregnancy schedule based on the provided due date, last period date, ultrasound date, conception date, or IVF transfer date.

Modify the values and click the Calculate button to use
About Pregnancy Calculations

Pregnancy typically lasts about 40 weeks (280 days) counting from the first day of your last menstrual period. However, the actual time from conception to birth is approximately 38 weeks (266 days).

How Pregnancy Is Calculated
  • From Due Date: Counts back 280 days from the expected delivery date.
  • From Last Period: Adds 280 days to the first day of the last menstrual period.
  • From Ultrasound: Based on measurements taken during an ultrasound.
  • From Conception: Adds 266 days to the estimated date of conception.
  • From IVF Transfer: For IVF pregnancies, based on the date of embryo transfer and the age of the embryo.
Understanding Trimesters
  • First Trimester: Weeks 1-13 (Days 1-91)
  • Second Trimester: Weeks 14-27 (Days 92-189)
  • Third Trimester: Weeks 28-40+ (Days 190-280+)

Note: This calculator provides estimates only. Always consult with your healthcare provider for the most accurate dates and personalized pregnancy care.