Choose Your Calculation Method

First Day of Last Menstrual Period

Enter the first day of your last menstrual period. This traditional method assumes a ~28-day cycle.

The first day of your last period:

Cycle Length (days):

Conception Date

Enter the date you believe conception occurred. This is useful if you know the exact date through IVF or tracked ovulation.

Date of Conception:

Want to know your conception date?

Ultrasound Date

Enter your ultrasound date and gestational age from the scan. Early ultrasound (first trimester) is the most accurate dating method.

Date of Ultrasound:

Gestational Age - Weeks:

Days:

Disclaimer: This calculator provides estimates only and should not replace professional medical advice. Please consult with your healthcare provider for accurate pregnancy dating and care.

Choose Your Calculation Method

First Day of Last Menstrual Period

Conception Date

Ultrasound Date

Your Pregnancy Information

Estimated Due Date

Current Pregnancy Week

Current Trimester

Days Until Due Date