How to Calculate a Baby's Due Date Based on Conception

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Knowing the date of a pregnant woman's last menstrual period is important for calculating her due date.
Knowing the date of a pregnant woman's last menstrual period is important for calculating her due date. (Image: pregnant #6 image by Adam Borkowski from Fotolia.com)

The average woman has a 28-day menstrual cycle, with ovulation generally occurring around 14 days from the onset of her last menstrual period (LMP). Because this can vary, it is impossible to pinpoint the exact day of conception. However, a pregnant woman's due date can be estimated by using the date of her LMP. This method takes into consideration that conception occurred roughly two weeks after her period began. This type of calculation may be done manually or by using online due-date calculators.

Calculate the Due Date Manually

Determine the date of the pregnant woman's last menstrual period.

Add seven days to the date of her last period.

Subtract three months.

Add one year to figure the estimated due date.

Calculate Using a DueDate Calculator

Go to a website with a due-date calculator.

Enter the date of the last menstrual period using the drop-down menu.

Enter the length of the pregnant woman's cycle, if known. Average length is 28 days, although this may vary from one woman to another. The cycle length begins the first day of a woman's menstrual period and ends the day before her next one begins.

Click "Calculate" to get the estimated due date.

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