Estimate your baby's arrival with our accurate pregnancy due date calculator. Choose from multiple calculation methods for a personalised result.
Saturday, 23 January 2027
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An estimated due date (EDD) is a crucial part of your prenatal care. It marks the projected day of your baby's birth, guiding healthcare providers in monitoring foetal growth and scheduling important tests. While it feels like a deadline, it is important to remember that it is only an estimate. Most babies arrive in the two weeks before or after their due date.
This Calculator Site tool offers several methods to determine your EDD. The most common is based on the first day of your last menstrual period (LMP), which is reliable for women with regular cycles. For those who know the exact date of conception, this method provides a more direct calculation. We also cater for assisted reproduction, with specific calculations for IVF transfers, and for dating based on early ultrasound measurements, which is often the most accurate approach.
A Due Date is an Estimate, Not a Deadline
Only about 5% of babies are born on their exact due date. The date is a valuable guide for you and your healthcare team, but it is best to think of it as a 'due window'. Your baby will arrive when they are ready, typically between 38 and 42 weeks. An early ultrasound scan provides the most accurate dating.
Beyond just the due date, understanding your current gestational age helps you follow your baby's development. The journey is divided into three trimesters, each with unique milestones. Key dates, such as the 12 and 20-week scans, are vital for assessing the baby's health. You can track your health alongside your pregnancy using our BMI Calculator.
40 Weeks
Average full-term pregnancy
3 Trimesters
The distinct stages of pregnancy
~5%
Babies born on their due date
How to use this Calculator Site tool
Select your calculation method from the options provided. You can use your Last Menstrual Period (LMP), your known Date of Conception, your IVF transfer date, or the results from an early Ultrasound. Enter the relevant date(s) and the calculator will instantly provide your estimated due date, current progress, and key milestones. For official guidance, visit the NHS due date calculator.
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