Due Date Calculator

Woohoo! You’re pregnant.

Now it’s time to find out when your baby is due – simply use our due date calculator to get the approximate due date.

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

How does the Rugrat Parent pregnancy calculator work?

Put simply, your baby’s due date (and the length of your pregnancy!) is 38 weeks from the day of conception. You might not know when the date of conception actually was though, so the standard for due date calculation works by counting 40 weeks from the first day of your last menstrual period (LMP).

Assuming your cycle is the average 28 days, your baby is only waiting to be conceived in the first two weeks of your 40 gestational weeks of pregnancy. At the start of your third gestational week, your baby has been created and by the week’s end, your baby is already one week old!

Our pregnancy calculator will help you work out your conception date. You can also find out the dates of the end of your first and second trimesters, and of course your estimated due date! Simply enter the first day of your last period!

Remember; the Rugrat Parent due date calculator is an estimate only; the exact due date varies slightly depending on the length of your cycle .

So now what!?

Our due date calculator has given you an idea of when your due date is, so now it’s time to get planning! It’s a thrill to follow your baby’s development every week of your pregnancy – there’s always something new and exciting happening as your baby grows.

We’ve got a stack of resources to support you during your pregnancy; from practical advice through to tips, tricks, hacks and guides to help you during this exciting time!