Free calculator
Age Calculator
Your exact age in years, months and days — plus a countdown to your next birthday.
- Next birthday in
- — days
- Total days lived
- —
Calendar-correct: real month lengths and leap years.
How exact age is worked out
Counting age looks simple until leap years and 28-day Februaries get involved. The correct method counts full years first, then full months, then leftover days — using each month's actual length.
That is why two calculators can disagree by a day: approximations divide total days by 365.25, while this one walks the calendar properly.
Age questions, answered
How is age in months and days calculated?
By calendar difference: full years first, then remaining full months, then remaining days — accounting for the different lengths of months and leap years.
Why does my age differ across calculators?
Some calculators divide total days by 365.25, which approximates. A calendar-correct method counts actual years, months and days, and handles leap years exactly.
Does the age calculator work for future dates?
No — a birthdate in the future is not a valid age. The calculator asks for a date on or before today.