It's important to remember that your birth date probability Information being input by each of the 9,000+ Mums who took part it was not a peer reviewed scientific study. The due date charts show possible due dates based upon data from a birth survey In this article by the Essential Parent website. You can learn more about this and about due dates If you reach this point, your hospital will likely induce labourįor the safety of the baby. This calculator, as with all due date calculators, should be used only as a guide, to give you a little help withĪt the point of 42 weeks, births are commonly considered 'post-term'. The vast majority are born two weeks either side. It is worth noting that only 5% of babies arrive on their due date. 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. The 280 day figure is based upon Naegele’s Rule and is the most common method of calculating due dates. 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. If you've chosen a different cycle, it will add or subtract days based upon that. 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).
This pregnancy calculator uses one of two methods to work out when your baby might be born. You can read more about the three trimesters in this article about the stages of pregnancy.
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. Find out the first day of your last menstrual periodĪround 90% of pregnancies last between 37 and 42 weeks.
#Due date predictor how to
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. If your cycle is different to 28 days, your calculation will vary based upon this. This calculation is based upon an average cycle of 28 days. The first day of your LMP countsĪs the first day of your pregnancy. To calculate how many weeks pregnant you are, our pregnancy calculator looks at the first day of your last menstrual period (LMP) and compares it to today's date. It is for this reason that calculations using Naegele’s rule can be considered as an estimate and not a The timing of ovulation, parity and maternal weight. Obstetrics & Gynaecology suggests a number of factors that can influence the length of your pregnancy, including ethnicity, height, variations in the menstrual cycle, 2 A 2020 study published in the International Journal of It's worth noting that although predicted due dates are commonly calculated at 280 days, a baby is born on its predicted due date just 5% of the This may vary if you have irregular periods. (40 weeks) to the date of the first day of your last period, using Naegele’s rule. Your estimated due date is commonly calculated by adding 280 days Unplanned or unsure? Find out Sexwise has more information and support.Your due date, also known as your estimated date of delivery, is the approximate date your labor might begin. Sign up for Start4Life's pregnancy and baby emails for expert advice, videos and tips on pregnancy, birth and beyond. health things you should know when you're pregnantįind out about what's happening when you're:.If you do not know it or are unsure, speak to a midwife or GP.Īs part of your pregnancy (antenatal) care, your midwife will offer you a 12-week scan that may give you a more accurate date for the birth of your baby. You need to know the first day of your last period to use this calculator. Pregnancy normally lasts from 37 weeks to 42 weeks from the first day of your last period. To find your due date, enter the date of the first day of your last period, and select 'show your due date'. Adjust the cycle length if your cycle is shorter or longer Some women's cycles are not exactly 28 days.
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