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 — insurance, school enrollment, retirement, 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 — nothing you type is transmitted, logged, or stored anywhere. You can even use it offline once the page has loaded.