Working out someone’s age sounds trivial — until you need it to be exact. Subtracting birth year from this year gives a rough answer, but the precise figure depends on months, days, and the quirks of the calendar.
TL;DR — Pick your date of birth in the age calculator to see your exact age in years, months and days, plus weeks and total days.
Why year subtraction isn’t enough
“This year minus birth year” only works if your birthday has already passed this year. If it has not, you are still a year younger than that subtraction suggests. Exact age checks the month and day too, so it stays correct whether your birthday was last week or is next month.
Months, days and leap years
A precise age counts complete years, then the leftover months, then the leftover days. That means handling months of different lengths — borrowing the right number of days when the current day is earlier than your birth day — and accounting for leap years along the way. The calculator does this bookkeeping for you.
Where it’s useful
Exact age comes up more than you would think: forms and eligibility checks, working out a baby’s age in weeks or months, milestone birthdays, or just satisfying curiosity about how many days you have been around. Try it in the age calculator for your years, months, days and totals at a glance.