Age Calculator
Calculate exact age in years, months, and days between two dates.
About the Age Calculator
An age calculator finds the exact time elapsed between a date of birth and another date — usually today — broken down into years, months, and days rather than just a single 'years old' number. This accounts correctly for varying month lengths and leap years, which manual subtraction often gets wrong.
Beyond checking your own age, this tool is useful for calculating a child's age for school enrollment cutoffs, figuring out how long until a milestone birthday, or measuring the exact duration between any two dates, such as an anniversary or a contract period.
Worked example
Example: someone born on March 12, 1990 checking their age on September 15, 2026 would see '36 years, 6 months, 3 days' — a precise breakdown rather than just '36'.
Frequently asked questions
- Does the calculator account for leap years?
- Yes. The calculation is based on actual calendar dates, so leap years (like February 29) are automatically factored into the day count without any extra input needed.
- Can I calculate age as of a future or past date, not just today?
- Yes — set the 'calculate age on' field to any date, past or future, and the tool will compute age as of that specific date instead of today.
- Why does my age in months look different from years × 12?
- Because months have different numbers of days, the months-and-days breakdown reflects actual elapsed calendar time, which can differ slightly from a simple multiplication of years by 12.
- Is this the same as my 'legal age' for enrollment cutoffs?
- The calculator gives an accurate chronological age, but legal or school cutoff rules vary by institution and region — always confirm the exact cutoff date policy with the relevant institution.