Your pregnancy and baby guide

Pregnancy due date calculator

The calculator on this page can help you work out when you might expect your baby to arrive.

When was the first day of your last period?

For example 15 / 5 / 2018

Some women's cycles are not exactly 28 days. If your cycle is shorter or longer than 28 days, please adjust the number below.

Using the due date calculator

To find your due date, enter the date of the first day of your last period, and click 'show your due date' - the calculator will do the rest. Pregnancy normally lasts from 37 weeks to 42 weeks from the first day of your last period.

As part of your pregnancy (antenatal) care, your midwife will offer you a dating scan that will give you a more accurate date for the birth of your baby.

Find out about what's happening when you're 4 to 8 weeks pregnant.

Sign up for Start4Life's pregnancy and baby emails for expert advice, videos and tips on pregnancy, birth and beyond.

You can find pregnancy and baby apps and tools in the NHS apps library.

Unplanned or unsure? Find out more information and support.

Page last reviewed: 10/04/2018
Next review due: 10/04/2021