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Gestational age

Calculate completed pregnancy weeks and days from the last period.

A calendar estimate; it does not confirm pregnancy or fetal growth. Use the date established by your clinician, especially with irregular cycles.

How to use this tool

  1. Review input units and the assumptions shown above the form.
  2. Enter your values and run the tool; editing inputs hides the previous result.
  3. Check the result before copying or printing. Amounts retain the input currency.
How can I use the result?

Copy or print the result, and review its units and calculation assumptions before using it.

Method references — not endorsements: ACOG

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