The first day of your LMP countsĪs the first day of your pregnancy. This calculation is based upon an average cycle of 28 days. If your cycle is different to 28 days, your calculation will vary based upon this.
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If you want to calculate an estimated due date manually using Naegele’s rule, here's how to do it: You will find that the sonographer at your first ultrasound scan (often called the dating scan) will give you a more accurate idea of how many weeks pregnant you are by measuring yourīaby from its head to its bottom to form a determination. Find out the first day of your last menstrual periodĪround 90% of pregnancies last between 37 and 42 weeks.
There are three trimesters in a pregnancy, with around 13 or 14 weeks per trimester: If a baby is born before 37 weeks, he/she is considered preterm or premature. You can read more about the three trimesters in this article about the stages of pregnancy. This pregnancy calculator uses one of two methods to work out when your baby might be born. If you fill in the start date of your last period, it takes that date and adds 40 weeks (assuming you've chosen a 28 day average cycle). If you've chosen a different cycle, it will add or subtract days based upon that. If you choose to calculate by ultrasound date, the calculator will work out your due date based upon how far along you are on that date. The 280 day figure is based upon Naegele’s Rule and is the most common method of calculating due dates. It is important to remember that this pregnancy calculator is meant to be a bit of fun and the results contain guesswork (as with all 'predictions' about the future).Īssuming a natural birth, there's no way of knowing for certain How accurate is this pregnancy calculator? German obstetrician Franz NaegeleĬreated his formula in 1812 and it has been referenced ever since.
It is worth noting that only 5% of babies arrive on their due date.
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