Age Calculator
Find your exact age in years, months, and days — instantly, accurately, and entirely in your browser.
How this age calculator works
This tool takes the exact difference between your date of birth and a reference date (today, by default) and breaks it down into years, months, and days — correctly accounting for leap years and the varying number of days in each month, rather than using a rough 365-day estimate.
It's useful well beyond curiosity: HR forms, eligibility checks for age-restricted services, school enrollment cut-offs, and legal documents often need an exact age rather than a rounded one.
Frequently asked questions
Enter your date of birth above and this calculator instantly works out your exact age in years, months and days, accounting for leap years automatically.
Yes, enter any date of birth to calculate that person's age — this works for calculating a child's age, a pet's age in human terms, or any historical date.
No, the calculation happens entirely in your browser using JavaScript. No date of birth is ever transmitted to a server or stored anywhere.