Xposio Tools Tools العربية

Age Calculator

Age is computed with real calendar arithmetic — counting full years and months by anniversaries, not by dividing days by 365.

Results are computed from your inputs and rounded for display. Verify important figures independently.

Enter a birth date (and optionally an "as of" date) to get the exact age in years, months, and days, the total days lived, and the countdown to the next birthday — all with genuine calendar math, in your browser.

Method & conventions

Years and months are counted by anniversaries, then leftover days from the last monthly anniversary. Convention (documented): an anniversary landing in a shorter month clamps to its last day — so someone born January 31 has their February monthly anniversary on Feb 28 (or 29), and a February 29 birth celebrates on February 28 in non-leap years.

Worked examples

  • Born 1990-07-19, as of 2026-07-19 → exactly 36 years, 0 months, 0 days
  • Born 2000-02-29, as of 2026-02-28 → 26 years, 0 months, 0 days under the clamped convention

Limits

Gregorian calendar only in this version; dates use your device timezone.

Frequently asked questions

When does a February 29 birthday count in a normal year?

This calculator uses the clamped convention: February 28. Some jurisdictions legally use March 1 — the convention is stated so the numbers are interpretable.