Due Date Calculator

Last Updated on 04/06/2021 by Mandy

Are you pregnant and wondering when your baby is due?

The Greenbubz due data calculator tells you the date of birth for your baby, based on the last day of your last menstrual period. It’s a very useful tool that will help make sure you don’t miss any important dates in the first year of your child’s life.

You can also use this calculator to find out how many weeks along you are, or what week number it is in pregnancy. This information can be helpful if you need to schedule an appointment with a doctor or midwife. And if all else fails, there’s always our handy “due date” button!

Click below to get started using our free online calculator!



Enter the date of the first day of your last menstrual period (LMP):



Probable date of conception:


Foetal Age Today:


Best date range for NT scan:


(12 weeks 3 days to 13 weeks 3 days)

Morphology Scan Date:


(19 weeks)

First Heart Tones by Doppler:


(11 to 12 weeks)

Best time to evaluate cervical length in patient with risk factors:


Best time for routine anatomy ultrasound:


(18 to 20 weeks)

Estimated Due Date: