How the age calculator works
This tool calculates the exact time between your date of birth and today (or any date you choose). It counts full years first, then the remaining months, then the leftover days — the same way you'd naturally state your age. It also converts your age into total months, days and hours, and counts down to your next birthday.
How to calculate age manually
Subtract the birth year from the current year, then adjust for whether your birthday has already occurred this year. For example, someone born on 15 March 2000, evaluated on 9 July 2026, is 26 years, 3 months and 24 days old. Doing this by hand is error-prone around leap years and month lengths, which is exactly what this calculator handles for you.
Common uses
People use an age calculator for official forms, eligibility checks (retirement, pension, voting, school admission), medical dosing, and simply for fun to see how many days they have been alive.
Frequently asked questions
How do I calculate my exact age?
Enter your date of birth in the field above and press Calculate. The tool instantly shows your age in years, months and days, plus totals in months, days and hours.
Does this age calculator account for leap years?
Yes. The calculation uses real calendar dates, so leap years and different month lengths are handled automatically.
Can I calculate age on a future or past date?
Yes. Use the optional 'Age as of' field to compute your age on any date instead of today.
Is my date of birth stored anywhere?
No. Everything runs locally in your browser. Nothing is uploaded or saved.