Calculating due date by conception date:īecause the human egg is capable of fertilization for only between 12 to 24 hours after ovulation the date of ovulation may be taken as being the date of conception. So if your last period started on July 10, you'd count back three months to April 10 and then add seven days, which means your due date would be April 17th.
Most pregnancies last around 40 weeks (or 38 weeks from conception), so typically the best way to estimate your due date is to count 40 weeks, or 280 days, from the first day of your last menstrual period (LMP).Īnother way to do it is to subtract three months from the first day of your last period and add seven days. It relies on you remembering the date of your LMP accurately, having a regular cycle and ovulating exactly 14 days before your average menstrual cycles. But if your cycle is irregular, the LMP method may not work for you. Calculating due date by last period:Ĭalculating your due date based on the first day of your last menstrual period (LMP) works well for women who have a relatively regular menstrual cycle. Our due date calculator uses the date of your last period and the average length of your menstruation cycle 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. Once you know your due date, it can help you prepare and plan for your labour and birth, as well as prepare your home for your baby. If you are expecting twins or triplets, it’s highly likely that you will deliver well before the actual ‘due’ date. However, no-one can predict exactly when you might go into labour and deliver your baby (or babies!). On average, most pregnancies last around 40 weeks – which is 38 weeks after conception or 280 days.
CONCEPTION TO DUE DATE FULL
Most babies are born at full-term which is between 37 weeks (259 days) and 42 weeks (294 days), a period referred to as "term", when the baby has reached full maturity. It’s also a way of your midwife or doctor to accurately plan your care in terms of visits, blood tests and scans (which are important for example, to interpret early pregnancy blood tests for the risk of congenital abnormalities). It’s a useful way of monitoring your baby’s growth, either by examining your tummy or by ultrasound scan (which is more accurate as it measures size and development). Your due date is a way of predicting a period of time when you might go in to labour, based on when you conceived.
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