Age Calculator
Exact age in years, months, days — and days between two dates.
About this calculator
Working out an exact age is trickier than it looks because months have different lengths and leap years add a day every four years. This calculator handles all of that, giving your precise age in years, months and days from a date of birth to any target date — today by default.
The same engine also answers the everyday question "how many days between these two dates?" — useful for counting down to an event, measuring a project timeline, tracking a subscription, or figuring out a deadline. It counts the true calendar distance rather than a rough 30-days-per-month approximation.
Because everything runs in your browser, no dates you enter are ever sent anywhere or stored. Type in a birthday or a pair of dates and the result updates instantly and privately.
Frequently asked questions
How is exact age calculated?
The calculator counts full years, then remaining full months, then leftover days, accounting for the actual length of each month and for leap years.
Can I count days to a future date?
Yes. Set the second date in the future and the calculator returns the number of days until it — a simple countdown.
Are leap years included?
Yes. February 29 is counted correctly, so ages and date differences spanning leap years are accurate.