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Age calculator
Calculate completed calendar years and elapsed days between a birth date and a reference date.
ISO calendar dates
Text
Browser only
Your input and output are processed in this browser. They are not uploaded for processing. No account is required.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter the requested values: Birth date (YYYY-MM-DD); Reference date (YYYY-MM-DD).
- Choose Calculate and review the result.
- Download the text result if useful. Reset restores the initial inputs and clears the result.
Examples
2000-01-01 to 2020-01-01 = 20 completed years.
Limitations
Runs entirely in your browser. Numeric calculations use IEEE-754 floating-point arithmetic; displayed values are rounded to 15 significant digits unless stated otherwise.
Civil dates use UTC without time-of-day or daylight-saving adjustments. A February 29 birthday reaches its next completed year on March 1 in non-leap years.
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