Calculators
Age Calculator
Calculate exact age in years, months and days, plus total months and days.
Runs in your browser Your input never leaves your device.
About this tool
Enter a date of birth and the tool shows the age as years, months and days, along with the total number of months and total number of days lived. By default it measures to today. Fill in the optional Age at date field to find an age on another date, past or future, for example when someone turned or will turn a certain age. If the birth date is after the target date, no result is shown. Days are borrowed from the previous month when needed, so the breakdown follows the calendar. Everything is calculated in your browser.
How to use it
- Pick the date of birth.
- Leave Age at date empty to use today, or choose another date.
- Read the age, total months and total days.
Example
Input
Date of birth 2000-01-15, Age at date 2026-03-10
Result
Age: 26 years, 1 month, 23 days Total months: 313 Total days: 9551
Common problems
- Nothing is shown
- The birth date is empty or later than the Age at date. Check both dates.
- The day count differs by one from another site
- Some calculators count the start day too. This tool counts the days between the two dates.
- Birthday near midnight
- Today is taken from the UTC date, so around midnight in your time zone the result can be a day off.