Age Calculator
How old someone is today, and how long until the next birthday.
Runs entirely in your browser. Nothing you enter is uploaded or stored.
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Pick a date of birth to see the exact age.
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How to use the Age Calculator
- Enter the date of birth.
- Change the second date if you want the age on a day other than today.
- Read the exact age, the total days, and the days to the next birthday.
Questions people ask
How are leap years handled?
By counting real calendar dates rather than dividing days by 365.25, so the answer matches what a person would say their age is. Someone born on 29 February has their age tick over on 1 March in non-leap years.
Does it use my timezone?
Dates are treated as plain calendar dates with no time of day, so the result is the same wherever you are.
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