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.
CONCEPTION DATE TO DUE DATE 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 Your due date, also known as your estimated date of delivery, is the approximate date your labor might begin.
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