Age Calculator
Free age calculator, age in years, months, days, and hours. Age on any date, next birthday countdown, days lived, and age difference between two people.
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How it works
Enter a birth date (and optional as-of date) to see age, days lived, and days until the next birthday. Use difference mode to compare two birth dates.
About Age Calculator
Informational only, not professional advice. Report an error.
An age calculator answers how old someone is on a given calendar day, down to years, months, and days, not just a rough guess from the birth year.
Use age-on-a-date mode for deadlines, genealogy notes, or enrollment cutoffs. Difference mode compares two birth dates without mental math.
Times are optional but unlock hours and minutes lived when you need finer granularity. All math runs locally in your browser.
Quick tips
- Use an as-of date in the past to verify age on a specific historical day.
- Difference mode ignores time-of-day unless you enter times on both dates.
- Leap-day birthdays use standard calendar arithmetic.
This tool is part of the free General collection on FindMeTool. Explore more General tools or browse the full tool directory.