Enter a birth date to calculate exact age down to the day, plus a countdown to the next birthday.
Calculating exact age sounds simple until you actually try to do it by hand — accounting for varying month lengths and leap years makes a precise "X years, Y months, Z days" figure surprisingly fiddly to get right manually, especially near a birthday or the end of February.
This calculator handles that arithmetic automatically. Enter a birth date, and it calculates the exact age as of today (or any other date you choose) broken down into years, months, and days — not just a rounded figure. It also reports total days lived, a number that's often used for milestone celebrations (turning 10,000 days old, for instance), and a countdown showing exactly how many days remain until the next birthday.
It's used for everything from filling out forms that require precise age calculation, to verifying eligibility for age-restricted programs or events, to parents tracking a child's exact age in the early years when months matter more than whole years, to anyone simply curious about their own numbers. Because the calculation happens locally using standard date arithmetic, results are exact and instant, with no data about your birth date ever leaving your browser.