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Age Calculator

Find your exact age in years, months, and days - plus next birthday countdown.

age-calculator.tool
Pick a date of birth to see your age
Nothing you enter here is ever sent to a server - everything is calculated locally in your browser.
Overview

What is a age calculator?

This tool calculates exact age in years, months, and days from a date of birth - not just a rounded year count. It also shows total days alive, which day of the week you were born on, and a countdown to your next birthday.

Quick start

How to use this tool

  1. 1Enter your date of birth.
  2. 2Your exact age (years, months, days) appears instantly, along with total days alive.
  3. 3See which weekday you were born on, and how many days remain until your next birthday.
Where it helps

Common use cases

Finding your exact age for a form that requires years, months, and days
Checking how many days remain until your next birthday
Finding out what day of the week you (or someone else) were born on
Calculating a child's precise age in months for a medical or developmental milestone
Good to know

Frequently asked questions

How is 'next birthday' calculated for a leap-year birthday (Feb 29)?

In years that aren't leap years, a February 29th birthday is celebrated on February 28th, which is what this tool uses for the countdown in non-leap years.

Does it count today as a full day if it's my birthday?

Yes - if today is your birthday, the next birthday countdown shows "Today!" rather than counting forward a full year.

Why does it show months and days, not just years?

A single year count hides useful precision - "32 years, 4 months, 12 days" is often what's actually needed for forms, medical contexts, or just curiosity, and it's calculated using real calendar math rather than a rough average.

Is my birth date sent anywhere?

No - the calculation happens entirely in your browser and is never transmitted or stored.

quick_facts.json

{

"runs_in_browser": true,

"data_sent_to_server": false,

"signup_required": false,

"price": "free",

"category": "Date/Time Tools"

}

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