Age Calculator
Enter your date of birth to see your exact age in years, months, and days — plus fun extras like your total days lived and how long until your next birthday.
How this age calculator works
Your age is calculated the way most of the world does it: you turn one year older on each birthday. The calculator counts full years first, then full months since your last birthday, then the remaining days. It handles leap years and different month lengths automatically, so the result is exact.
For example, someone born on March 15, 2000 is, on July 2, 2026, exactly 26 years, 3 months, and 17 days old.
What about leap-year birthdays?
If you were born on February 29, you have a real birthday only once every four years. Legally, most countries treat your birthday as March 1 (or February 28, depending on the jurisdiction) in non-leap years. This calculator counts a completed year when the calendar reaches the last day of February in non-leap years.
Different age systems around the world
| System | How it counts | Where used |
|---|---|---|
| International | Born at age 0; +1 on each birthday | Most of the world (and this calculator) |
| East Asian ("Korean age") | Born at age 1; +1 every New Year | Traditional Korea (officially abolished in 2023), traditional China |
| Fiscal / school-year age | Age as of a cutoff date (e.g., Sept 1) | School enrollment, youth sports |
South Korea officially switched to the international system in June 2023, which made everyone in the country one or two years "younger" overnight.
Fun ways to read your age
- Days lived: a 30-year-old has lived roughly 10,957 days.
- 10,000-day birthday: falls at about age 27 years 4½ months — a popular modern milestone.
- Heartbeats: at an average 70 beats per minute, each year of life is about 36.8 million heartbeats.
Frequently asked questions
How is my exact age calculated?
Completed years are counted from birthday to birthday, then completed months from the last birthday, then leftover days. Leap years and 28/29/30/31-day months are all handled by the calendar itself.
Why do two calculators sometimes give slightly different ages?
The "months and days" remainder can be counted in more than one way when the start day doesn't exist in the target month (e.g., the 31st). Differences are at most a day or two, and the year count is always the same.
Can I calculate age at a past or future date?
Yes — set the "Age as of" field to any date, such as the day of an exam, a wedding, or a historical event.
Does the calculator store my birth date?
No. Everything runs in your browser; nothing is sent to a server.