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Age Calculator

Calculate your exact age in years, months and days from your date of birth — plus total months, weeks and days lived.

How to use this tool

  1. 1Paste or type your input above.
  2. 2The result updates instantly.
  3. 3Copy the output with one click.

Frequently asked questions

How is age calculated?+

Enter your date of birth and the tool counts the exact years, months and days to today (or any date you choose), accounting for leap years.

Is my data private?+

Yes. The tool runs entirely in your browser — nothing you paste or type is uploaded to a server.

Guides & deep dives

How Your Due Date Is Calculated (and How Accurate It Is)

Learn how Naegele's rule, LMP, and ultrasound dating work together to set your due date — and why only about 5% of babies arrive on that exact day.