Age Calculator
Calculate exact age in years, months, and days from a birth date. Uses calendar dates rather than a fixed number of days per year.
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Calculating calendar age
The calculator compares a birth date with today's date in the browser's local time zone and returns years, months and days.
Output behavior and limits
Month-end anniversaries are clamped to the last day of a shorter month. This convention may differ from an eligibility rule or legal definition.
Use a valid past date and check your device date. For a February 29 birthday, verify the relevant organization's anniversary convention separately.
Before replacing your original
- Processing runs locally in this browser; keep a copy of the source input.
Processing details
Runs in your browser. File handling policy
Implementation and guidance reviewed .
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