About the Age Calculator
Age is one of those things that looks simple until you try to compute it. Counting whole years, then months, then days — rather than dividing by 365.25 — is what gives the answer people actually expect, and it handles leap years and short months correctly.
Also known as: how old am i, date of birth calculator, age from birthday, exact age calculator, age in years months days.
How to use this calculator
- Enter date of birth, age at this date.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
Count whole years, then months, then remaining days
Worked example
Using the values pre-filled in the calculator above:
- Date of birth: 1990-06-15
- Age at this date: 2026-09-22
the calculator returns:
- Age: 36 years, 3 months, 7 days
- Age in years: 36
- Total months: 435
- Total days: 13,248