Baby Due Date Calculator

Baby Due Date Calculator Enter the date of the first day of your last menstrual period and the myDr calculator will tell you the approximate due date of your baby's birth.

1. Enter the date of the first day of your last period:

Date: (click to set date)



calendar will go here.

Remember that the normal range of time between conception and birth can vary from 37 weeks to 42 weeks, depending on the length of your menstrual cycle and the date of your last period.

This myDr calculator uses the method used by doctors, where the baby's due date is 280 days from the first day of your last period.

Ultrasound scanning can provide a more accurate determination of your baby's due date, which is especially helpful for women with irregular cycles and those who are not sure of the date of their last period.

What to do next

You can track your baby's development in the womb, find out about healthy eating during pregnancy, and tests you can have during pregnancy. The myDr Babies & Pregnancy Centre has information on all topics for new and expectant parents.

Last Reviewed: 17 August 2015


1. Fetal development: The 1st trimester (updated 10 Jul 2014). (accessed Aug 2015).
2. Prenatal care: 1st trimester visits (updated 31 Jul 2015). (accessed Aug 2015).
3. Ultrasound during pregnancy (updated Feb 2011). (accessed Aug 2015).
4. US National Library of Medicine, National Institutes of Health. MedlinePlus. When you pass your due date (updated 11 Jun 2014). (accessed Aug 2015).