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Pregnancy Due Date Calculator

Your due date is typically calculated based on the first day of your last menstrual period (LMP). Pregnancy is 266 days from conception, or about 280 from your LMP. This is 40 weeks or 9 months (give or take a few days). If you don't know when your last period was, your doctor or gynaecologist will use an early ultrasound to help you determine your due date. The ultrasound is more accurate the earlier it is done.
First day of last period
dd
mm
Average menstrual cycle length
days

Your results:

Estimated conception date
17 August 2014
Estimated gestational age
4 months
Estimated due date
9 May 2015
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How does this tool help me?

Having an accurate due date is important because it can help prevent misleading prenatal test results including prematurity. This calculator provides an estimated due date, but remember it is only an indicator and not the exact date.

Note: The results you receive from this tool are not intended to be a substitute for individual medical advice in diagnosing a health/lifestyle problem. They are provided to give you an estimate of results based on professionally accepted formulae and algorithms.

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