Birth Date Calculator

Enter the start date of the last menstrual period before becoming pregnant in the calculator below and press the calculate button.

Below this page, you can also find the answers for frequently asked questions about this subject.
Birth Date Calculator
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How is the date of birth calculated?

It is not known exactly when babies are born. However, it is likely that the baby will be born 280 days after the start of the last menstrual period before conception. Although this period is uncertain, the proportion of babies born just in time is approximately 5%.

What information is provided as a result of the calculation?

In addition to the estimated date of birth, you can find out how many weeks of pregnancy you have and how many days until birth.