# Age Calculator

> Age calculator: compute your exact age in years, months, and days from any birth date, plus days until your next birthday. Free, runs in your browser.

- **Canonical URL:** https://boringtoolskit.com/age-calculator/
- **Category:** Everyday Calculators
- **Evidence level:** authored-methodology
- **Reviewed:** July 2026
- **Last verified:** 2026-10-12
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

## How it works

Calendar age counts complete years, then months, then days between birth date and the as-of date; totals convert elapsed days to hours and weeks.

## Worked example

Born June 15, 1990, as of July 13, 2026: 36 years, 0 months, 28 days, or 13,177 days elapsed.

## Assumptions

- Dates use the proleptic Gregorian calendar implemented by the browser.
- Total weeks are total days divided by seven and may be fractional.
- Legal age rules for leap-day birthdays can vary by jurisdiction.

## Common questions

### What is an age calculator?

An age calculator is a free online tool that instantly computes your exact age in years, months, days, weeks, and hours based on your date of birth.

### Does this age calculator store my personal data?

No. This age calculator runs entirely in your browser and requires no signup or account. Your date of birth is processed locally and never sent to any server.

### How accurate is the age calculator?

The age calculator is highly accurate, using your exact birth date and the current date to compute your precise age down to the day.

## Related tools

- /date-difference-calculator/
- /business-days-calculator/
- /hours-minutes-calculator/

## Sources

- [Science and Business Reading Room](https://www.loc.gov/research-centers/science-and-business/about-this-research-center/)
- [ECMAScript Date specification](https://tc39.es/ecma262/multipage/numbers-and-dates.html#sec-date-objects)

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