Calculators · Free Tool
Age Calculator
Calculate exact age in years, months, and days from a date of birth, plus days until the next birthday.
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- Exact age
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- Total days
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- Total weeks
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- Next birthday in
About this tool
Enter a date of birth and get the exact age in years, months, and days, along with the total number of days lived and a countdown to the next birthday. You can also set a custom "as of" date to compute age at any point in time.
Exact ages matter for forms and eligibility checks, such as insurance, school enrollment, retirement, and visas, where "years, months, days" precision is required rather than a rounded number.
Common uses
- Fill in exact age for official forms and applications
- Check a child's age in months for school or medical requirements
- Find out how many days remain until a birthday
Frequently asked questions
How does the calculator handle leap-year birthdays?
A February 29 birthday is treated as completing a year on March 1 in non-leap years, which matches the most common legal convention.
Why do months in the result vary in length?
The calculation counts calendar months, which range from 28 to 31 days, so "1 month" from January 31 lands on February 28/29, exactly as calendars do.
Is my data uploaded to a server?
No. This tool runs entirely in your browser using JavaScript, so nothing you type is transmitted, logged, or stored anywhere. You can even use it offline once the page has loaded.