What is the best way to calculate due date and estimate delivery date?

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It is really complicated. The simple calculations listed below based on a fixed addition from your last menstrual period or those used by most online calculators are terribly inaccurate. A lot of recent research has indicated a number of other variables to consider. The best free site that has an advanced algorithm is www.redbabybook.com. This is also very good as it gives probabilities of delivery on a range of dates, rather than a fixed single date, which is always going to be less than 5% chance of being true.

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This is how to calculate your due day.

The due month is: your LMP month + 9. The due date is: your LMP date plus 7.

For example, if your LMP was 3/10/95: 3 + 9 = 12 (Dec), 10 + 7 = 17 (17th day). If the added month exceeds 12, then you subtract 12. For example, if you LMP was 6/20/95, the month will be (6 + 9) - 12 = 3 (March), and the date will be 20 + 7 = 27, so your due date will be 3/27/96.

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There are loads of methods and calculators out there but their accuracy is limited. The one which is by far the most sophisticated is at httpwww.redbabybook.com.

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LoL, I was always taught -3 +7, if your LMP was 10/11 you -3m= 7/11 and add 7d= 7/18.

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You can always use an online due date calculator like at amazingpregnancy.com

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I have located the most accurate and reliable Due Date and Conception Date there is.

Click on this link and scroll down till you get to the table. Follow the appropriate column ie first day of your last menstrual period to get your due date.

http://www.genetree.com/about/conception-calculator.asp

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Maybe I don't get it but what is all the maths above? Why would you do all this if someone else would do it for you?! www.redbabybook.com answer seemed a lot easier for me and I could play around with all my dates to see different days. The link above didn't work + it was for getting your family tree not due date!

First answer by anonymous. Last edit by Josie1299. Contributor trust: 2 [recommend contributor]. Question popularity: 259 [recommend question]

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amazingpregnancy

redbabybook

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