Average Calculator

"Average" usually means the mean — add everything up and divide by how many there are — but statistics has three different averages, and they answer different questions. This calculator gives you all of them at once, along with the measures of spread that tell you how tightly your numbers cluster.

The **mean** is the arithmetic average, the familiar one, and it's sensitive to outliers: one enormous value drags it upward. The **median** is the middle value when everything is sorted, which is why income and house-price statistics use it — it isn't distorted by extremes. The **mode** is whatever appears most often, the only average that works for non-numeric categories and the right one when you want "the most common". Seeing all three side by side often reveals more about a dataset than any one alone.

Beyond averages, the calculator reports the range (highest minus lowest), variance, and both forms of standard deviation — sample (n−1 divisor) and population (n divisor) — because coursework and research usually need the sample version while the population version applies when your list is the complete group. Paste numbers separated by commas, spaces or new lines in any mix; non-numeric entries are simply ignored. Everything computes live in your browser.