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Age Calculator

Find someone's exact chronological age from their date of birth. You can also calculate age on a specific past or future date — useful for eligibility checks, forms and milestones.

Exact age
Choose two dates
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How to use the age calculator

  1. Pick the date of birth using the date picker.
  2. Leave “Calculate age on” as today, or choose another date.
  3. Click Calculate age for the exact years, months and days.
  4. Use it for school admission, retirement planning or birthday countdowns.

Age Calculator — FAQs

How is age calculated exactly?

The calculator counts completed calendar years first, then completed months, then the remaining days — the standard chronological method.

Can I calculate age on a past date?

Yes. Change “Calculate age on” to any date to see how old someone was (or will be) on that day.

Does it account for leap years?

Yes. Because it works with real calendar dates, leap days like 29 February are handled correctly.

Is my birth date stored anywhere?

No. Everything runs in your browser on ToolKishop and nothing is uploaded or saved.

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