Due date calculator
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How many weeks pregnant am I?
Our pregnancy due date calculator will help you to work out when your baby’s likely to arrive, so you can start planning ahead. Most babies arrive within a week of their due date.
Calculate your pregnancy week
What's your due date?
Calculate your baby's due date
When was the first day of your last period?
What's the average length of your menstruation cycle?
Calculate your due date
Your due date is8 april 2018
You are in week
How to calculate your due date
Unless you've been keeping track of when you ovulate, it’s hard to work out when you conceived, and therefore, when your baby will arrive. Our due date calculator uses the date of your last period and the average length of your menstruation cycle to calculate your due date.
How accurate are due dates?
While due dates give you a good idea of when your baby may arrive, it’s unlikely your baby will be born on this exact date. In fact, only 4% of babies arrive on their due date1 – most babies arrive within a week of their due date.
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Ovulation and conception usually occur about two weeks after the first day of your period, and the average pregnancy lasts between 37 weeks and 42 weeks. Using this information, along with the average length of your menstruation cycle, we are able to calculate your estimated due date.
- Jukic AM et al. Length of human pregnancy and contributors to its natural variation. Hum Reprod. 2013 Oct; 28(10): 2848–2855.
Free online tools
Practical tools, from our Due Date Calculator to our handy Baby Symptom Checker
Your pregnancy week by week
Questions about feeding and nutrition?
Our midwives, nutritionists and feeding advisors are always on hand to talk about feeding your baby. So if you have a question, just get in touch.