Age Calculator
Calculate your exact age in years, months, days, hours, and minutes from your birthday.
☕ This tool is free forever. If it saved you time, buy me a coffee.
Navigation
Private by default
Your inputs never leave your browser. Nothing is stored or sent anywhere.
When to use this
Use the calculator to decompose the interval between a birth date and an As of date into completed calendar years, months, and days. It also reports elapsed calendar-day totals and the next birthday under the tool's stated anniversary rule.
Date-only inputs are treated as civil calendar dates, not as local midnight timestamps. That keeps elapsed-day totals stable across daylight-saving transitions.
Good to know
Month-end anniversaries clamp to the last valid day. For example, a February 29 anniversary becomes February 28 in a non-leap year. This is a documented calculator convention, not a statement about legal age rules in any jurisdiction.
Future birth dates are rejected. The birth date must be on or before the As of date, so the displayed decomposition cannot become negative or internally contradictory.
Administrative rules vary. Do not use this general calendar calculator as a substitute for the rule specified by a government agency, school, insurer, or other decision maker.