Pregnancy due date calculator

So you’ve just found out that you’re expecting a baby – congratulations! We’re excited to be with you at every step of your pregnancy journey. 

Here we’ll take a look at how you can calculate your baby’s due date, answer some of the questions you might have now that you know you’re pregnant, and introduce our easy-to-use pregnancy due date calculator.

First things first, you might be wondering when you can expect your baby to arrive. Below you’ll see our pregnancy due date calculator. It’s easy to use and will give you a pretty good idea of your baby’s due date.

To use our due date calculator, enter the date your last period started as well as your average cycle length (typically that’s 28 days, but it’s normal for your cycle length to be slightly longer or shorter).

Then all that’s left to do is click ‘show my due date’, and voila!

If you’re unsure when your last period started, speak to your GP or midwife, who can help you calculate your due date.

Pregnancy calculators are a good way of estimating your baby’s due date, something you’re probably eager to know after you see that positive result on your pregnancy test.

Your estimated due date (or EDD) is there to give you a rough idea of when you can expect to meet your little one. When you see your sonographer for your 12-week scan, also known as the dating scan, you’ll get a more accurate due date to pop into your diary. Read more about what to expect from your pregnancy ultrasound scans.

Our due date calculator helps you estimate your due date by doing the math for you, but you can work out when you’re due yourself if you know the first day of your last menstrual cycle.

A full-term pregnancy normally lasts about 37-42 weeks, 3 weeks from the date of conception. But it can be tricky to pinpoint exactly when you conceived, so most pregnancy calculators use the first day of your last menstrual period to work out your due date instead. That’s why we round up to 40 weeks of pregnancy in total.

So, if you fancy working out your due date yourself, you just need to count 40 weeks from the first day of your last menstrual period. Or, as a shortcut, you can count back 3 months from your last period and then add 7 days. That will give you the day and month of your estimated due date. 

When you take a pregnancy test and find out you’re pregnant you should get an appointment with your GP or local midwife service as soon as you can, around 6-7 weeks. This is known as your booking appointment, and you can read more about this here. At this appointment, your midwife will give you lots of useful information about looking after yourself and your baby during your pregnancy, and what you can expect along the way.

If you feel ready, you might want to tell close friends and family that you’re pregnant right away. Some women, however, choose to wait until after their 12-week scan to announce their pregnancy to the rest of the world, but you should do what feels right to you. If you're not sure, you can speak to your midwife.

Finding out you’re pregnant can bring up a whole mix of emotions, especially if this is your first baby. It’s normal to feel happy, excited, nervous, scared, or all of the above. In our experience, it can help to know what to expect at each stage of your pregnancy. That’s why we have a wealth of information about what to expect every week from now until your due date (and beyond!).

Click here for information, tips and advice on your brand-new parenting adventure. You’ve got this.