Age Calculator
Calculate your exact age and days until your next birthday.
What is an Age Calculator?
An age calculator computes your exact age in years, months, and days by accounting for varying month lengths and leap years. Unlike simply subtracting birth years, this tool handles edge cases like being born on February 29th or calculating age across century boundaries. It's useful for legal age verification, retirement planning, or simply satisfying curiosity about exactly how many days you've been alive.
How to Use
- Select your birth month, day, and year from the dropdowns.
- Your age is calculated instantly — no button needed.
- See your exact age, total days lived, and days until your next birthday.
Frequently Asked Questions
How are leap years handled?
Leap years occur every 4 years, except for century years not divisible by 400. The calculator accounts for all 97 leap years per 400-year cycle when computing total days lived and exact age differences. If you were born on February 29, the calculator correctly handles your birthday appearing only every four years.
What's the legal definition of age?
In most jurisdictions, you legally turn a year older at the start of your birthday (midnight). Some countries have specific rules for leap day babies-for example, in the UK they legally age on March 1st in non-leap years.
Can I calculate age between two arbitrary dates?
Yes. By changing the end date from today to any other date, you can determine how old someone was (or will be) at any point in time-useful for historical research or future planning.
