Age Calculator

About Age Calculator

Exact age matters for eligibility, milestones, and forms. Calendar age accounts for varying month lengths and leap years rather than dividing days by 365 only.

CalculatorCamp computes age from birth date to today or a chosen reference date.

Informational tool—not legal proof of age.

How to use this tool

Select birth date and optional as-of date. Calculate for years, months, days breakdown.

Formula & methodology

This age calculator applies the standard relationship below. Intermediate values are kept at full precision; only the displayed result is rounded.

calendar difference via date arithmetic (not simple 365.25 day division)

Worked example

Someone born on 15 June 1995 is, on 19 September 2026, 31 years, 3 months, and 4 days old. The calculator counts whole years first, then whole months, then the remaining days using the actual length of the preceding month.

Tips for accurate results

• Use official document dates for legal age verification.
• Time zones rarely affect date-only age; midnight boundaries matter for some laws.
• Leap day birthdays age normally on Feb 28 or Mar 1 in non-leap years per locale.
• Compare with date-difference for spans between any two dates.

Frequently asked questions

Sources & references

The factors and formulas used by this tool follow these references:

• Khan Academy — Ratios, rates, and percentages
• Wolfram MathWorld — definitions of mean, ratio, root, and percent

Last reviewed: September 2026. Found an error? Tell us and we will correct it.