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Pregnancy Calculator

This calculator requires the use of Javascript enabled and capable browsers. This calculator is designed to give the estimate conception and due dates, based on your data entered. It will also estimate the fetal age.

While a complete medical explanation of the process is beyond the scope of this calculator, the results are a reasonably close estimation. Many of our users report accuracy to be within 3 to 5 days. If you are uncertain as to the EXACT meanings of the questions, consult your doctor, a nurse or health care professional. Enter the date of the first day of your last period in the DD/MM/YYYY format, including the slashes. Then, enter the average length of your normal cycle and the average luteal cycle length. The normal ranges are 22 to 45 days and 9 to 16 days respectively while the defaults are 28 and 14 days; the accuracy of your information is important but if unsure, accept the averages, our defaults. Click on Calculate to generate the results.

This pregnancy calculator provide dates that are only an estimate based on the data you supplied. We strongly suggest that you see your doctor for the best prenatal care possible. Our best for you and your baby!

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Pregnancy Calculator

Required Data Entry
Last Menstrual Period First Day MM/DD/YYYY
Average Length Of Cycles 22 - 45
Average Luteal Phase Length 9 - 16

Calculated Results
Date Of Conception Estimated
Delivery Due Date Estimated
Fetal Age Estimated
last updated 7/13/11

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