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Age Calculator

Calculate completed years of age on a chosen reference date, including birthdays and leap-day births.

Convert in your browser · No sign-up

For a February 29 birthday, February 28 is the anniversary in non-leap years. This is a calendar convention, not a legal age determination.

Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.

Result

Add your input or load an example, then run the tool. Your result will appear here.

How to use

  1. Calculate completed years of age on a chosen reference date, including birthdays and leap-day births.
  2. Choose the mode or options, then run the tool.
  3. Review the result, then copy or download the TXT file.

Example

2000-06-15 → 2026-06-14 = 25 y

Details and limitations

Text stays in your browser; it is not sent to a conversion server.

Format references

Tool page updated: