Age Calculator
Work out your exact age in years, months and days — plus total days lived and the countdown to your next birthday.
How it works
age = whole calendar years from the birth date, then whole months, then leftover days
The calculator walks the real calendar instead of dividing by 365.25: it counts how many whole years fit from your birth date, then whole months from that anniversary, then the days that remain. That is why someone born June 15 always turns a round number of years exactly on June 15, no matter how many leap years passed in between. The total days lived is an exact calendar-day count, which is also why it never equals years × 365.
Worked example
Born June 15, 1995 and checked on September 11, 2026: 31 whole years reach June 15, 2026, two more months reach August 15, and 27 days remain — 31 years, 2 months, 27 days, or exactly 11,411 days lived.
Frequently asked questions
Why do different sites give a different months-and-days age?
Month lengths vary, so tools must choose a convention when borrowing days from a partial month. This calculator uses the standard one — walk whole years, then whole months, then count leftover days — while some tools approximate with fixed 30-day months and drift by a day or two.
How is a February 29 birthday handled?
In common years the anniversary is treated as February 28, so the age still ticks over once a year. Some jurisdictions legally use March 1 instead — either way the difference is a single day.
Is the total days lived exact?
Yes — it is a true calendar count that includes every leap day. Shortcuts that multiply years by 365 lose roughly one day for every four years lived.
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This calculator is for educational purposes. Double-check important results before acting on them.