Local · Private · Free

Age Calculator

Your exact age to the day, a live birthday countdown, the weekday you were born, and an age gap with anyone: calculated precisely in your browser.

Date of birth

Birth time (optional) Adds hour-level precision and a to-the-minute birthday countdown.

Age as of date

Age as of time

Use the current time and keep it ticking live

Compare with a second person (optional) Shows their age and the exact age gap.

Show fun lifetime estimates

Calculated locally, birthdays never leave your browser.

Calendar-correct, leap-aware

An exact age isn’t “days ÷ 365”. Months have different lengths and leap years add a day, so this calculator uses true calendar borrow-math: it counts whole years, then whole months, then leftover days, the same way a passport office would. Born on 29 February? Your birthday is treated as 1 March in non-leap years. The fun lifetime numbers (heartbeats, breaths, full moons) use population averages and are rough estimates, not medical data.

About Age Calculator

Age Calculator is a free, private productivity tool that runs entirely in your web browser. Get your exact age in years, months and days, a live next-birthday countdown, and the weekday you were born. Because everything happens locally on your device, your data is never uploaded to a server. There is no sign-up and no installation required, and the tool keeps working offline. Like every free tool by Digital Heroes, it is 100% free with no limits.

What you can do

Find your exact age in years, months and days with calendar-correct, leap-aware math.

See totals in weeks, days and hours for a bigger-picture view of your life so far.

Get a live countdown to your next birthday, updated every second.

Discover the day of the week you were born on instantly.

Compare two birthdays to see the exact age gap between any two people.

Toggle fun lifetime estimates: heartbeats, breaths, full moons and trips around the Sun.

How to use Age Calculator

Open Age Calculator. It runs entirely in your browser, with no signup.

Enter your date of birth. Add an optional birth time for minute-level precision.

Leave live mode on to see your age tick in real time, or pick a custom "as of" date.

Optionally enter a second date of birth to compare ages and see the gap.

Copy the summary to your clipboard with one click. Your data stays on your device.

Frequently asked questions

Is Age Calculator free?

Yes. Age Calculator is completely free for everyone. No sign-up, no account and no usage limits.

Is it private? Are my files uploaded anywhere?

No. Age Calculator runs entirely in your browser on your own device. Your data never leaves your computer and nothing is uploaded to a server.

Does it work offline?

Yes. This tool is a Progressive Web App. Once the page has loaded it keeps working offline, and you can install it as an app from your browser.

Do I need to install anything or create an account?

No. Just open the page and start using it. No account or installation needed. Installing it as an app is optional and only adds offline convenience.

What does Age Calculator do?

It gives you your exact age in years, months and days, a live next-birthday countdown, the weekday you were born, age totals in weeks and hours, and an age-gap comparison for two people.