Date & Time
Age Calculator
This calculator finds the exact age between two dates — a date of birth and a reference date — broken down into years, months, and days.
How it works
The calculator counts full years between the two dates, then the remaining full months, then the remaining days, matching how age is normally described.
Worked example
Someone born on January 1, 2000, and a reference date of September 14, 2026, is:
26 years, 8 months, 13 days old
Frequently asked questions
How is age calculated in years, months, and days?
The calculator finds the difference between the two dates, counting a full year for each birthday that has passed, then the remaining whole months, then the remaining days — the same way age is counted in everyday life.
Can I calculate age on a date other than today?
Yes — set the "Age on" field to any date to find out how old someone was, or will be, on that specific date.
Does this account for leap years?
Yes — the calculation is based on actual calendar dates, so leap years are handled automatically without needing any special adjustment.