How are months and days computed?

The tool uses calendar arithmetic: it counts full years first, then full months, then the remaining days in the partial month.

Can I find my age on a future date?

Yes. Change the target date to any day — past or future — and the tool recomputes.

The tool will warn you — the target date must be on or after the birth date.

It looks at the same month/day as your birthday in the current year. If that day has passed, it uses next year's birthday.

Days are exact calendar days. Weeks is floor(days/7). Hours is days × 24 (no daylight-saving adjustments).

Your exact age in years, months & days — plus a birthday countdown.

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Watch a quick simulation of this tool in action — no file needed.

Follow these steps — everything happens instantly in your browser.

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Step 1. Enter a birth date.
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Step 2. Optionally change the target date (it defaults to today).
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Step 3. See exact years/months/days and the next-birthday countdown instantly.

Everything you might want to know about age calculator.

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See one instant across the world's major timezones.

A real working calculator: functions, constants, memory & percent.