How to Calculate Your Exact Age
Updated June 2026
Find exact age in years, months, days.
Your age in years is easy; your exact age in years, months, and days takes a little care. Here's how to get it right.
Age in years
Subtract your birth year from the current year — then subtract one more if your birthday hasn't happened yet this year. Born March 2000, and today is January 2026? You're 25, not 26, because March hasn't arrived.
The off-by-one trap
The most common mistake is forgetting that last step. Always check whether this year's birthday has already passed before settling on a number.
Years, months, and days
- Count the full years since your birth.
- Count the whole months since your last birthday.
- Count the leftover days.
Because months have different lengths (and leap years exist), doing this by hand is error-prone — the calculator below handles all of it exactly.
Other handy uses
The same math finds anyone's age, how many days until an event, or how long ago something happened. For plain day counts between two dates, a date-difference calculator is the quicker pick.
Find exact age in years, months, days.
Frequently asked questions
How do I calculate age from a date of birth?
Subtract the birth year from the current year, then subtract one if the birthday hasn't occurred yet this year.
Do leap years affect my age?
They affect the exact day count but not your age in years. People born on Feb 29 usually mark their birthday on Feb 28 or Mar 1 in common years.