Age Calculator
Years, months, days & more.
About Age Calculator
Calendar age describes the interval between a birth date and a reference date in years, months, and days. Calendar months have different lengths, which makes age different from a simple day-count division.
Important considerations
Results are informational, not a legal determination of eligibility. Local rules and time zones can affect official birthday cutoffs.
Want to understand the math?
Read our plain-language guide: How to Calculate Your Exact Age in Years, Months, and Days