Calculate your exact age in years, months, and days instantly, right in your browser — free, with no sign-up and no data ever leaving your device.
Last updated: July 14, 2026
An age calculator works out your exact age in years, months, and days from a date of birth — the kind of precise figure that's genuinely awkward to get right in your head once you factor in different month lengths and leap years. Instead of counting on your fingers or reaching for a calendar, you get an accurate answer in the time it takes to pick a date and click a button.
This tool goes a step further than a plain "you are 32" answer. It breaks the result down into years, months, and days, which turns out to matter for things like age-restricted eligibility, developmental milestones for children, or just knowing exactly how many days are left until a birthday.
Everything runs client-side using JavaScript's built-in Date object. Your date of birth is read, compared to today's date, and discarded — nothing is sent to a server or saved anywhere.
Using this age calculator takes three steps:
No sign-up, no downloads, no settings to fuss with — just a clean, accurate answer every time.
The math behind this is simpler than it looks, but the edge cases are where hand-calculating trips people up. The calculator subtracts your birth year, month, and day from today's year, month, and day. If today's day-of-month happens to be earlier than your birth day-of-month — say you were born on the 28th and today is the 5th — it borrows a month's worth of days from the previous month before finishing the subtraction, exactly the way you'd carry a digit in long subtraction.
Because the calculation works off real calendar dates rather than a fixed "365.25 days a year" estimate, leap years and February's shorter length are handled automatically. If you were born on February 29, the tool still calculates correctly, rolling the anniversary over sensibly in years that don't have a February 29.
Knowing your exact age matters more often than you'd think — driver's license applications, school enrollment, job eligibility, insurance premiums. Working it out manually is fine for a round number, but the moment months and days come into play, it's easy to be off by one, especially right around a birthday or a year boundary.
This calculator removes that risk entirely, and it's just as useful for tracking the age of children, pets, or anything else measured from a start date. It's free, runs privately in your browser, and gives a consistent answer every time you use it.
Need to work out a tax-inclusive total or run other quick math while you're here? Our GST Calculator and Scientific Calculator cover those.
Select your date of birth using the date picker.
Click "Calculate Age" or press Enter to get your age instantly.
See your exact age in years, months, and days — accurate and clear.
No. The calculation runs entirely in your browser using JavaScript. Your date of birth is never sent to a server, stored in a database, or logged anywhere.
Yes. The calculator compares your birth date to today's date directly using JavaScript's built-in Date handling, which already accounts for leap years and the differing number of days in each month, so you don't need to think about it.
Yes. You can select February 29 as a birth date in any leap year, and the calculator will work out the exact age normally, correctly rolling over on non-leap years.
Not directly — this version always measures age as of today's date. If you need age as of a different date, such as an exam or policy date, see the tips section on this page for how to work it out.
This usually happens around month boundaries. If today's day-of-month is earlier than your birth day-of-month, the calculator borrows a month's worth of days from the previous month before finishing the subtraction, which is the same way you'd count it by hand.
It's accurate for everyday and informational use, but for anything going on an official document, always verify the figure against the original birth certificate or ID rather than relying solely on an online calculator.
No installs, no browser extensions, no account. Pick a date, click calculate, and read the result.
Yes. There's no usage cap, no premium tier, and no fee to use the calculator as many times as you need. More questions? Our full FAQ page covers the rest of the toolkit.