Age Calculator

Find exact age in years, months, and days between two dates.

Enter a value for all required fields.

About this calculator

Calculate exact calendar age from a birth date to today or any other target date.

How to use

  1. Enter the birth date.
  2. Enter the target date (defaults to today).
  3. See age, totals, and days until the next birthday update automatically.
  4. Use Reset to clear inputs, or Copy to copy the result.

Formula

Age = calendar difference (years, months, days) from birthDate to targetDate
Total days = number of midnights between the dates
Next birthday = days from targetDate to the next anniversary of birthDate

Example

Birth date 2000-01-15, target date 2026-07-24 → age 26 years, 6 months, 9 days (calendar difference).

FAQ

What if the birth date is after the target date?

The calculator shows a date-order error. The target date must be on or after the birth date.

How is next birthday calculated?

It counts whole days from the target date until the next anniversary of the birth date.

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Date Difference Calculator

Find the span between two dates in days, weeks, weekdays, and more.

Results are for informational purposes only. Verify important calculations independently.