Exact age
Calculate age in years, months, and days.
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Tool guide
Exact age: how it works
Practical information to understand the result and use this tool correctly.
About Exact age
An age calculator subtracts a birth date from today (or another reference date) and expresses the result in years, months, and days.
Useful for forms, eligibility checks, and personal milestones. Calendar quirks (month lengths, leap years) are handled by standard date arithmetic in the browser.
Legal age definitions can depend on local rules (e.g. turns 18 at the beginning of the day). When in doubt, confirm with the authority that requested the age.
How to use it
- 1Enter the date of birth.
- 2Optionally set a reference date (defaults to today).
- 3Read age in years, months, and days.
Frequently asked questions
- Why do results differ by a day?
- Time zones and whether the current day counts as completed can shift day-level results. For legal deadlines, use the official rule, not only a web calculator.
- Can I calculate age on a past or future date?
- Yes—set the reference date to the day you care about (event, exam, contract).