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Pregnancy Due Date Calculator

Estimate your due date from the first day of your last period, and see how far along you are.

What is Pregnancy Due Date Calculator?

A due date is an estimate of when a baby will be born. Doctors usually count 40 weeks, or 280 days, from the first day of the last menstrual period.

What this tool does

Adds 280 days to the first day of your last period, adjusted if your cycle is longer or shorter than 28 days. It also shows how far along you are today and the approximate date of conception.

How to use it

  1. Pick the first day of your last period.
  2. Adjust the cycle length if it is not 28 days.
  3. Read the estimated due date.

Did you know?

  • Only about 4 to 5 percent of babies are born on their exact due date.
  • This is an estimate for planning. Your doctor or midwife will confirm your due date.

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