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HowTo Calculate Your Estimated Due Date (EDD) At Home

September 13, 2017

 As an expectant mom or pregnant mom, the first day you are confirmed positive the next question that comes up is when I am expecting my precious jewel.

Generally, it is difficult to know the real or actual date of conception but with the knowledge of your last menstrual period (LMP) date, before you were tested positive, you can then estimate the date of your baby’s arrival.

 Knowing your EDD is just having awareness or rough idea of when your baby will arrive to help monitor your baby’s development but this does not mean that your baby is going to be born on that day.

 Researchers have estimated that only 5% of expectant moms give birth to their baby on their actual EDD, if you don’t end up giving birth on this date then you don’t have to stress yourself.

 It is also estimated that a high number of women tends to have their ovulation period 2 weeks after the initial day of their monthly period and gets pregnant immediately after that.

Your EDD can be calculated easily if your menstruation comes regularly but it tends to be trickier if it is irregular. An average pregnancy is stated to exist between 37 and 42 weeks but can be altered if having an induced labor or multiple pregnancies.

 Ways To Calculate Your EDD At Home.

Using The Multiplication Method

You can get your EDD by adding 7 days to your LMP date, then you multiply it by 40 weeks. What you get is your EDD.
 See illustration below. 
      If your LMP date is on the 5th of March, add 7 days to it and multiply it by 40 weeks. This will be your result
7 * 40 weeks
Your due date will be
December 12th, 2016.


Using The Addition Method

This can be calculated by adding 280 days to the first day of your last menstrual period (LMP) date, the result you get is your EDD.

 This method works well for women that observe their menstrual cycle every 28 days. See illustration below.


If your LMP date is March 5, 2016, then you add 280 days to the date
You will get your EDD as this

  December 12, 2016.

Using The Subtraction Method

In this method, you are going to subtract 3 months from your LMP date and add 7 days; your result will be your EDD.

 See illustration below.


If your LMP date is on the 5th of March 2016
You will subtract 3 months from the date, you will get

 Add 7 days to the date, you will get December 12, 2015
Add 1 year to it, you will get this


Naegele’s Rule

 In this method, you need to figure out your LMP, count 3 months backward and add 7 days and add an entire year just to the previous calculation. What you get is your EDD.

 For women who ovulate 14 days before their period begins, this is how to calculate your EDD.

 If your cycle is 40 days, then your ovulation day will be on the 26th day. Just add 266 days after your ovulation day then you will have this.

 March 5, 2016 – 14 days = February 20th, 2016 (day of ovulation) + 266 days = December 12th, 2017

 OR LMP date + 1 week and add 9 months will give you your EDD.
See illustration below.



If your LMP date is March 5, 2016

Your ovulation date is February 20, 2016

When you add 266 days or 9 months to this date, the result will be this

 Your EDD will be December 12th 2016.

Using Online Method

You can get your EDD by browsing for a free online EDD calculator, then select calculator from a good source. All you need to do is to provide your LMP date and the calculator will give you a rough estimate of your EDD.

More so, if using any of these methods are stressful or confusing or you don’t know your LMP date, it is better you opt for the doctor’s option.

This is visiting a doctor, who will ask you to go for a vaginal ultrasound which he will use to give you an estimated date.

In conclusion, when you are pregnant, prepare your mind for some uncertainties because the estimated date may or may not be your date of delivery. Just be ready that your baby can pop out at any time and always hope for the best.

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