How do I calculate age from date of birth?

Subtract birth date from the reference date and convert the interval into years, months and remaining days.

Does it handle leap years?

Yes. Calendar rules including February 29 are applied.

Yes. It runs in the browser with no account.

Calculate exact age in years, months, and days from date of birth.

Exact age

36 years, 9 months, 27 days

Date of birth

Calculates precise age accounting for full years, months, and days.

Examples

Born 2000-05-15 → ~25 years (depends on today)

Born 1995-01-01 → ~31 years

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Recommended next step

After using Age Calculator, continue with Date difference.

Tools selected to complete the same task.

4 steps

Tool guide

Practical information to understand the result and use this tool correctly.

An age calculator subtracts the birth date from today (or another reference date) and expresses the result in years, months and days.

It accounts for varying month lengths and leap years so the day count stays consistent with the calendar.

Useful for forms, eligibility checks and “how old will I be on this date” questions.

How do I calculate age from date of birth?: Subtract birth date from the reference date and convert the interval into years, months and remaining days.
Does it handle leap years?: Yes. Calendar rules including February 29 are applied.
Is this age calculator free?: Yes. It runs in the browser with no account.