# Age Calculator

> Find the exact age in years, months, and days — plus totals and the countdown to the next birthday.

URL: https://uttir.com/age-calculator
Categories: calculators
Privacy: Dates are processed locally in your browser and never uploaded.

## About

Enter a date of birth to get the exact age in years, months, and days, using real calendar arithmetic — month lengths and leap years included. Optionally pick a target date to compute the age at that moment instead of today.

Totals in months, weeks, and days plus a countdown to the next birthday make it handy for forms, milestones, and curiosity alike.

## How to use

1. **Pick the date of birth** — The age at today’s date appears immediately.
2. **Optionally set a target date** — See the age as of any other date, past or future.

## Examples

### A birthday mid-year

Born 15 Jan 1990, age on 20 Jun 2026.

Input:

```
1990-01-15 → 2026-06-20
```

Output:

```
36 years, 5 months, 5 days
```

## FAQ

### How are months counted?

By calendar months: from the 15th of one month to the 14th of the next is one month minus one day. When the day of month has not yet arrived, days borrow from the previous month’s real length.

### Does it handle leap years?

Yes. All math uses real calendar dates, so February 29 and leap years are accounted for automatically.

### How is age calculated across time zones?

By date of birth in your local time zone. If you were born on 2000-01-01 in Tokyo, you are one year older on 2026-01-01 in Tokyo than you would be on 2026-01-01 in New York, because the local date flips at different moments.

### Does the age calculator work with leap years?

Yes. The calculator accounts for leap years and uses the standard Gregorian calendar rules — including the centurial corrections (years divisible by 100 are not leap years unless also divisible by 400).

## Related tools

- [Date Calculator](https://uttir.com/date-calculator) — Count the days between two dates, or add and subtract days from any date.
- [Percentage Calculator](https://uttir.com/percentage-calculator) — Three percentage tools in one: percent of a value, ratio as a percent, and percent change.

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For the full HTML page with the live tool, visit https://uttir.com/age-calculator.
This file is the markdown rendering at https://uttir.com/age-calculator.md. See https://uttir.com/llms.txt for a site-wide summary.