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Age Calculator

Find exact age in years, months, days, hours and minutes.

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Quick Tool Overview

The Age Calculator turns a date of birth into an exact age in years, months and days — not a rounded number of years — and can calculate age as at any other date, which is what forms, visa applications and eligibility rules usually ask for.

What it does
Calculates exact age between a birth date and any other date
You give it
A date of birth and an optional comparison date
You get back
Years, months, days, total time lived and the next birthday
Best for
Forms, eligibility rules, visa applications and birthdays
Calculators Free, unlimited use No sign-up Runs in your browser

About the Age Calculator

Enter a date of birth to get an exact age broken down into years, months and days, not just a rounded number of years. You can also calculate age as at any other date, which is what forms, visa applications and eligibility rules usually ask for.

Alongside the age you get the total days, hours and minutes lived, the weekday you were born on, and how many days remain until the next birthday. Leap years and varying month lengths are handled by real calendar arithmetic rather than by dividing days by 365.25, so the result matches how a human counts an age.

Key features of the Age Calculator

Real calendar arithmetic

Leap years and varying month lengths are handled properly rather than by dividing days by 365.25, so the result matches how a human counts an age.

Age as at any date

Set a comparison date to answer "how old will they be on the closing date", which is what most forms actually ask.

Total time lived

Days, hours and minutes since birth are shown alongside the years-months-days breakdown.

Day of the week you were born

Calculated from the calendar, not looked up, and correct for any date.

Days until the next birthday

A countdown to the next one, which is the second thing everyone wants to know.

How to use the Age Calculator

  1. 1

    Enter the date of birth

    Pick the date from the calendar or type it in.

  2. 2

    Set the comparison date

    It defaults to today, but you can set any date to work out age as at that day.

  3. 3

    Read the breakdown

    Exact years, months and days, total days lived, birth weekday and the countdown to the next birthday.

Frequently asked questions

By calendar arithmetic. The calculator counts real months and days rather than approximating a year as 365.25 days, so the answer matches how ages are counted in practice.

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