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Age Calculator
An age is not a subtraction of years: it depends on whether the birthday has passed and on how long each month in between happened to be. This tool counts the calendar properly, gives the age in years, months and days, and adds the total days lived.
How to use it
- Enter the date of birth.
- Leave the second date as today, or set it to a date in the future for a form or contract.
- Read the exact age, the total days and the countdown to the next birthday.
Examples
- Born 14 March 1990, read on 7 August 2026 → 36 years, 4 months, 24 days.
- Forms that ask for age at a fixed date: set the second box to that date instead of today.
- Born on 29 February: non-leap years shift the anniversary to 1 March in this count.
Questions people ask
Why do two age calculators sometimes disagree by a day?
Because they treat time zones and the boundary of the day differently. This tool compares calendar dates at local midnight, so no result shifts because of the hour you visited. If a legal document is involved, always follow the counting rule written in it.
Can I use it for pets, projects or anniversaries?
Yes. Nothing in the calculation is specific to people. Put a founding date, an adoption date or a start of employment in the first box and you get elapsed years, months and days in exactly the same form.
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Updated: 2026-08-07