How to calculate pregnancy due date manually

Many won’t be aware of their pregnancy until their first missed period, and by that time they could be up to five weeks in. That means that simply estimating nine months from the day you take a pregnancy test isn’t going to calculate your due date, and, even so, factoring in a few weeks here and there for ovulation won’t either.  · Naegele’s rule. Naegele’s rule involves a simple calculation: Add seven days to the first day of your LMP and then subtract three months. For example, if your LMP was November 1, . Simply add nine months and seven days to the date, and you've got your pregnancy due date. Here's an example of how it works: Say the first day of the last normal menstrual period was January 1st. Add seven days to that number, and you get the number 8. Add nine months, and you get October. The expected due date of that pregnancy, then, is October www.doorway.ruted Reading Time: 4 mins.

If you take the day of ovulation and add days to it, you can determine your delivery date. Some pregnancy sites have charts where you can track this data and calculate the delivery date. If you know your date of conception, for instance if you underwent a fertility procedure, you can add days to that date. 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 days, from the first day of your last menstrual period (LMP). Another way to do it is to subtract three months from the first day of your last period and add seven days. An estimated due date can be calculated by following steps 1 through 3: First, determine the first day of your last menstrual period. Next, count back 3 calendar months from that date. Lastly, add 1 year and 7 days to that date.

It is very important to know the due date for a pregnant women in order to be ready for birth psychologically and physically. To calculate your due date. This calculator gives you many options for estimating gestation and delivery dates. · EDC by LMP is calculated by adding days (40 weeks) to the first day of. Based on the last menstrual period, the estimated due date is 40 weeks from the first day of the period. This is just an estimate since only about 5% of babies.