Due date calculator: when is my baby due?

Pop in the first day of your last period, your conception date or your IVF transfer date, and we'll work out your due date, how many weeks pregnant you are, and the key dates coming up.

How your due date is worked out

From your last period. Pregnancy is counted from the first day of your last period, not the day you conceived, because most people know when their period started. A typical pregnancy lasts around 40 weeks (280 days) from that date, based on a 28-day cycle. If your cycle is usually longer or shorter, we adjust the date to match.

From conception. If you know when you conceived, your due date is around 38 weeks (266 days) later.

From IVF. If you had IVF, your clinic will give you a due date based on your transfer date and the age of the embryo, which is very accurate.

Your dating scan will confirm it

Your midwife will offer you a dating scan between 8 and 14 weeks. Measuring your baby gives a more accurate due date than counting from your period, so don't be surprised if it moves by a few days.

Only around 1 in 20 babies arrive on their due date. Think of it as a due fortnight.

Most babies are born between 37 and 42 weeks. Once you know how far along you are, follow your pregnancy with our week-by-week guide.

How is my due date calculated?

Your due date is usually 40 weeks (280 days) from the first day of your last period, adjusted if your cycle is longer or shorter than 28 days. Your dating scan gives the most accurate date.

How many weeks pregnant am I?

Count from the first day of your last period, or enter that date into the calculator above to see exactly how many weeks and days pregnant you are today.

How accurate is a due date?

It's an estimate. Only around 1 in 20 babies are born on their due date, and most arrive between 37 and 42 weeks.

What if I don't know the date of my last period?

Speak to your midwife or GP. Your dating scan between 8 and 14 weeks will work out how far along you are.

Keep reading

This calculator gives an estimate for general information only and isn't a substitute for advice from your midwife. Your due date will be confirmed at your dating scan. See the NHS due date calculator.

If you’re trying to conceive (TTC), you probably know that there are certain foods and nutrients that become especially important once you’re pregnant. But nutrition plays a vital role even when trying to conceive, much like laying a strong foundation before constructing a house.

Certain nutrients create that foundation by supporting egg and sperm health (yes, nutrition matters for both partners), hormone balance and creating a hospitable environment for a fertilized egg to implant. In fact, studies show that certain nutrients can help increase fertility and improve success rates for both natural conception and fertility treatments.

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In other words, nutrition is a key player in the TTC journey, but getting the right nutrients in the right quantities can be tricky. That’s where supplements come in. Just as you’d take a multivitamin to fill in nutritional gaps for optimal health, fertility supplements can give you that extra nutrient boost.

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Choosing supplements for your fertility journey

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When choosing a supplement to support your fertility journey, look for science-backed, high-quality ingredients. Our editors are careful to select and partner with brands that use ingredients that have been clinically studied to support fertility. Eu Natural® (pronounced you) covers all those bases and more. We love knowing that Eu Natural® products contain zero artificial additives, binders, or fillers and are lab-tested to ensure purity and potency.

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