How to use Age Calculator
- Enter your date of birth.
- Optionally set an โas ofโ date.
- Read the breakdown of years, months, and days.
Worked examples
Concrete numbers and cases you can check against the tool above.
Born 12 March 2000, as of 12 March 2026
That is exactly 26 years. If the as-of date is 11 March 2026, age is 25 years, 11 months, 27 days โ month lengths and leap days (2000 was a leap year) are why counting on your fingers fails. Always set the โas ofโ date when a form asks age on a deadline, not today.
When to use Age Calculator
Exact age in years, months, and days matters for enrollment, benefits, and milestones. Manual calendar math is error-prone around month lengths and leap years.
Common use cases
- Confirm age eligibility for a youth program.
- Calculate precise age for a birthday caption.
- Fill forms that ask for age as of a specific date.
- Plan anniversary milestones down to the day.
Inputs and outputs
- Calendar dates
Privacy
This tool runs entirely in your browser. Your data never leaves your device โ nothing is uploaded to our servers.
Frequently asked questions
- Does it account for leap years?
- Yes. Age is computed from real calendar dates, including leap-day effects.
- Can I calculate age on a future date?
- If an โas ofโ date is available, set it to any valid date to project age.
- Is my birthdate uploaded?
- No. It never leaves your browser.