Pregnancy due date calculator

You can use our pregnancy calculator to work out your baby's approximate arrival date or your date of conception. Also work out how long you have been pregnant for on a future date - useful for planning those flights in advance.

Enter the first day of your last period:


Enter your normal menstrual cycle in days:

Your results:

The date of conception:

Weeks you have been pregnant:

Your baby is due on:

How many weeks will I have been pregnant on:


Your result:

Weeks you will have been be pregnant:

Work out my conception date using baby's birthday:

    (year i.e. 1975)

Your result:

Date of conception: