Pregnancy Calculator

Calculate From:

First Day of Last Period:

Average Length of Cycles:

Conception Date:

Ultrasound Due Date:

How Many Weeks Pregnant at Ultrasound:

IVF Transfer Date:

IVF Transfer Type:

Understanding Your Pregnancy Timeline

Our pregnancy calculator helps you estimate your due date based on several different methods. Whether you know the first day of your last menstrual period, conception date, or have ultrasound results, this tool provides accurate estimates for your pregnancy timeline.

How Pregnancy Calculators Work

Pregnancy typically lasts about 40 weeks from the first day of your last menstrual period (LMP) to your estimated due date. This calculator uses the following methods:

Last Menstrual Period (LMP): Adds 280 days (40 weeks) to your LMP date
Conception Date: Adds 266 days (38 weeks) to your conception date
Ultrasound Dating: Adjusts based on fetal measurements from your ultrasound
IVF Transfer Date: Calculates based on embryo age at transfer