Due Date Calculator - Pregnancy - NHS

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Due date calculator

The calculator on this page can help you work out when you might expect your baby to arrive. This is known as your estimated due date (EDD).

When was the first day of your last period?

For example, 15 9 2025

Day Month Year Cycle length in days Your menstrual cycle may not be exactly 28 days. Adjust the cycle length if your cycle is shorter or longer than 28 days.

Using the due date calculator

To find your estimated due date (EDD), enter the date of the first day of your last period, and select 'show your estimated due date'. Pregnancy normally lasts from 37 weeks to 42 weeks from the first day of your last period.

You need to know the first day of your last period to use this calculator. If you do not know it or are unsure, speak to a midwife or GP.

As part of your pregnancy (antenatal) care, your midwife will offer you a 12-week scan. This scan can more accurately estimate how many weeks pregnant you are.

Find out about:

• your NHS pregnancy journey
• your first midwife appointment
• health things you should know when you're pregnant

Find out more from Start For Life about what's happening when you're:

• 4 weeks pregnant
• 5 weeks pregnant
• 6 weeks pregnant
• 7 weeks pregnant
• 8 weeks pregnant

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

Unplanned or unsure? Find out about making a decision about a pregnancy (Brook website).

More in Finding out you're pregnant

• When you find out you're pregnant
• Your pregnancy to-do list
• Health things you should know in pregnancy
• Maternity and paternity benefits and leave

Page last reviewed: 21 August 2024 Next review due: 21 August 2027