How to Use the Age Calculator
- Enter your date of birth.
- Optionally change the 'age at' date to any other date.
- See your exact age in years, months and days.
- View total days lived and days until your next birthday.
How age is actually counted
Working out an exact age is more than subtracting years. A precise result counts full years, then the remaining months, then the leftover days, and it has to account for months of different lengths and for leap years.
That is why simple mental subtraction can be off by a day or more. This calculator does the calendar maths for you and returns your age in years, months and days, plus the total number of days if you need it.
Handy uses for an age calculator
Beyond curiosity, exact ages matter for eligibility (school, work, pensions, legal thresholds), for filling in forms precisely, and for planning around anniversaries or milestones.
You can also use it to find the exact gap between any two dates: how many days until an event, or how old something is, from a document to a pet, without counting on your fingers.
Frequently Asked Questions
How is exact age calculated?
The tool counts full years, then remaining months, then remaining days between your birth date and the target date, adjusting for month lengths and leap years.
Can I calculate age at a past or future date?
Yes. Change the 'age at' date to any date to find how old someone was, or will be, on that day.
Does it account for leap years?
Yes. February 29 and varying month lengths are handled using real calendar dates, so the day count is accurate.
Is my birth date stored anywhere?
No. The calculation happens entirely in your browser and nothing you enter is sent or saved.