A full-term pregnancy normally lasts about 38 weeks from the day of conception. However, it can be a bit of a challenge to pinpoint this exact day, which is why most baby due date calculators go from the first day of your last period. This is typically around two weeks before conception; add on the 38 weeks and you get your standard 40-week pregnancy.

Although only around 5% of women in the UK give birth on schedule, our pregnancy due date calculator will give you a good idea of when you’ll meet your little one for the first time!