Age Calculator — Find Your Exact Age Online

Your exact age in one click

Enter a date of birth and the calculator instantly works out your exact age — years, months, days, and every smaller unit — comparing your birthday with today or any date you choose. Everything runs locally in your browser, so your dates never leave your device.

Curious what's happening behind the scenes? Read how an age calculator actually works — the calendar math, leap-year rules, and edge cases explained in plain language.

Frequently asked questions

How do I check my age?

Just enter your date of birth — your exact age appears instantly in years, months, and days, plus a countdown to your next birthday. No other step needed.

How do I see my real age?

Select your date of birth and an "Age at date" (today by default). The calculator shows exactly how long you have been alive — years, months, days, and even seconds.

How to calculate human age?

Count the completed years since birth, then the remaining months and days to today. The calculator does this automatically and handles leap years, so you always get the exact figure.

How old is 17 years old in days?

Roughly 6,205 days, plus one extra day for each leap year in that span. Enter a birth date and today into the calculator to get the precise number of days.

How to calculate date of birth?

To find a date of birth, take a known age and subtract it from today, keeping the month and day in mind. The calculator works the other way — enter a date of birth to get the exact age at any date you choose.

Is this age calculator free and private?

Completely. It runs entirely in your browser, so your dates are never uploaded, tracked, or stored on any server. There is no sign-up and no limit on how many ages you can calculate.

How do leap-day birthdays work?

If you were born on February 29, the calculator counts your birthday on February 28 in non-leap years and on February 29 in leap years, following the common convention used by schools and official records.