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§ · free tool

Age calculator. Exact to the second.

Your exact age in years, months and days, a live next-birthday countdown, the weekday you were born, and an age gap with anyone — calculated entirely in your browser, nothing uploaded.

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A free online tool by Digital Heroes

Adds hour-level precision and a to-the-minute birthday countdown.

Shows their age and the exact age gap.

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.

§ 02 · what you can do

Every number a birthday hides.

Exact age to the dayYears, months and days with calendar-correct, leap-aware borrow-math — add a birth time for hour and minute precision.
Big-picture totalsYour life so far in total months, weeks, days and hours, formatted instantly.
Live birthday countdownA ticking countdown to your next birthday — with the age you’ll turn and the weekday it lands on.
The day you were bornInstantly see which weekday your birth date fell on — for any date in history.
Age gap between two peopleAdd a second date of birth to see both ages and the exact gap in years, months, days — and total days.
Fun lifetime estimatesHeartbeats, breaths, full moons seen, trips around the Sun and hours asleep — then copy the whole summary in one click.
§ 03 · how to use it

Five steps, no signup.

  1. Enter your date of birth — add an optional birth time for minute-level precision.
  2. Leave live mode on to watch your age tick in real time, or untick it and pick a custom “as of” date and time.
  3. Read your exact age, the totals in months, weeks, days and hours, and the weekday you were born.
  4. Optionally add a second date of birth to compare ages, and toggle the fun lifetime estimates.
  5. Click Copy summary to put the whole result on your clipboard — nothing ever leaves your device.
§ 04 · faq

Frequently asked questions.

Is the Age Calculator free?
Yes — completely free for everyone. No sign-up, no account and no usage limits.
Is it private? Is my birthday uploaded anywhere?
No upload, ever. All the math runs in your browser on your own device — the dates you enter never leave your computer, and nothing is stored.
How is the exact age calculated?
With true calendar borrow-math, not “days ÷ 365”: it counts whole years first, then whole months, then leftover days, respecting different month lengths and leap years — the same method official documents use.
What if I was born on 29 February?
Leap-day birthdays are handled correctly: in non-leap years your birthday is treated as 1 March, so the next-birthday countdown never points at a date that doesn’t exist.
Are the fun lifetime estimates accurate?
They’re rough, for-fun figures based on population averages — about 72 heartbeats and 16 breaths per minute, 8 hours of sleep per night, and the real lunar cycle of 29.53 days. They are not medical data.
Can I calculate the age gap between two people?
Yes — enter a second date of birth and you’ll see that person’s exact age plus who is older and by exactly how many years, months and days (and total days).

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