Pregnancy Calculator - Babies Due Date Calculator

Our pregnancy calculator will provide you with a close estimate of the due date of your baby and several other interesting dates including date of conception, end of your first and second trimester, the date your child is due on, and the number of weeks you have been pregnant for.

Our free pregnancy calculator is below.

The formula to estimate the due date of a baby is calculated by adding 266 days to ovulation (Ovulation Calculator), or 280 days to the first day of your last menstrual cycle.

Human female pregnancy lasts 40 weeks on average. However do not forget that the average month is 4 weeks and several days long, not four weeks exactly. It is for this reason that doctors calculate how many weeks pregnant you are, as measuring pregnancy by weeks is a far more accurate means to determine length of pregnancy.

Not sure if you are pregnant? Read our Signs and Symptoms of Being Pregnant article.

Your babies due date can never be predicted precisely, even when the exact date of conception is known, as there are several variables that can affect the date given as your babies due date. For instance menstrual cycles can last from 22 days to as many as 44 days, so to obtain reasonably accurate results you will need to enter the average number of days in your menstrual cycle in the pregnancy calculator.

Another factor that can influence your babies birth date is the fact that you may not have conceived on the day you had intercourse! Human sperm can actually survive in a womans uterus for up to 3 days after sex. Your doctor will help you obtain the most accurate estimated date of conception or due date.

Our pregnancy calculator will provide you with a close estimate of the due date of your baby and several other interesting dates including date of conception, end of your first and second trimester, the date your child is due on, and the number of weeks you have been pregnant for. This is the way most doctors calculate a due date without an ultrasound.

If you are trying to conceive either a boy or girl baby be sure to check out our article on Choosing Babys Sex at Conception

Pregnancy Calculator

What was the FIRST day you started your LAST menstrual period? JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember   12345678910111213141516171819202122232425262728293031   200720082009201020112012201320142015201620172018 Average number of days in your menstrual cycle Likely date of conception: End of your first trimester (12 weeks): End of your second trimester (27 weeks): Your baby is due on (40 weeks): Number of weeks you have been pregnant for: Calculate how many weeks you will be pregnant on a given date. JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember   12345678910111213141516171819202122232425262728293031   200720082009201020112012201320142015201620172018 Number of weeks you will be pregnant for: Calculate the date you will be pregnant for (input x) number of weeks. Number of weeks (1 - 40) Calculated date: Enter the babies due date to calculate the most likely conception date JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember   12345678910111213141516171819202122232425262728293031   200720082009201020112012201320142015201620172018 Calculated conception date: Pregnancy calculator is the courtesy of Antechius® Creative Software tools

Mother to be

Further Reading

Pregnancy Trimesters

Week by Week Guide to your Pregnancy

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