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Step 1
Keep tabs on your menstrual cycle. If you want to ensure that you get the most accurate due date possible, try to have the forethought to keep track of your period before becoming pregnant. This makes it a lot easier to get an idea of when your bundle of joy will be showing up.
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Step 2
Know the first day of your last menstrual period. Knowing the exact date of the first day of your last menstrual period is the best starting point for calculating a due date. If you don't have the exact date, review a calendar to see if you can jog your memory or come up with an approximate date.
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Step 3
Have an idea of your conception date. While this can sometimes be hard to keep track of, get together with your partner and try to pin down a possible date.
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Step 4
Count 280 days from the first day of your last menstrual period. Circle that date on the calendar in pencil. Count 266 days from the date you and your partner came up with for the conception date. Circle that date on the calendar as well. Now split the difference between the two dates and you will have a good idea of your due date.
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Step 5
Take advantage of one of the Internet's many due date calculators. Inputting the date of the first day of your last menstrual period in a due date calculator like the ones found on the Baby Center and March of Dimes websites is a quick and easy way to calculate your due date. You will also find a lot of helpful advice and resources for expectant mothers.
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Step 6
Get a second opinion. Though your doctor's guess at a due date may be just as good as your own, an ultrasound will give you added information on your baby's state of development.
