Age Calculator
Work out an exact age in years, months and days from a birth date.
Age to the day
Your age in years is easy; your age in years, months and days is fiddly, because months have different lengths and leap years get in the way. This works out an exact age from a birth date to any date, so you can find someone's precise age for a form, a milestone, or curiosity.
Enter a birth date and see the exact age.
Why the day count is awkward
The reason age is not simple arithmetic is the calendar itself — months range from twenty-eight to thirty-one days, and leap years add a day every four years with their own exceptions. Counting the exact days between two dates has to account for all of that, which is the kind of bookkeeping a calculator does reliably and a person does not. It is also how you find figures like your age in total days or the countdown to a next birthday.
Frequently asked questions
Does it account for leap years?
Yes — an exact age has to, since leap years and the varying lengths of months are what make counting the days awkward.
Can it show my age in days?
Yes — from the same date maths it can express an age in total days as well as years, months and days.
Is anything uploaded?
No. The calculation happens in your browser.