Math

Average Calculator

Mean, median, sum, and range from any list of numbers — instant result as you type.

Numbers, separated by commas or spaces

Average (mean)

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Enter a list of numbers

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Key features

Calculates mean, median, minimum, and maximum from a single list of numbers
Accepts numbers separated by commas, spaces, or line breaks — no strict formatting required
Handles lists of any length instantly, from a handful of numbers to hundreds
Shows the sum and count alongside the average for quick verification

Why use this average calculator

Faster than building a spreadsheet formula for a one-off calculation
Median calculation helps spot when outliers are skewing your data
Runs entirely in your browser — your data is never uploaded anywhere

When to use mean vs. median

The mean is what most people think of as "the average" — every value pulls its weight equally. That makes it useful for things like exam scores or measurements where values cluster fairly evenly. But a handful of extreme values can drag the mean far from what's typical: average income in a small group jumps sharply if one person earns far more than everyone else.

The median sidesteps that problem by simply picking the middle value, so it's a better summary when your data has outliers — home prices in a neighborhood, for example, or salaries across a whole company. As a rule of thumb: if the mean and median are close together, your data is fairly evenly spread; if they're far apart, something in the list is pulling the mean away from what's typical.

A worked example

For the list 12, 15, 18, 95, 20, the mean comes out to 32 — pulled sharply upward by the single outlier, 95. The median, by contrast, is 18 — much closer to what most of the values in the list actually look like, illustrating exactly why the two numbers can tell very different stories about the same data.

Why the gap between mean and median is itself useful information

When mean and median sit close together, your data is fairly evenly distributed. When they diverge sharply — as in the example above — it's a signal that one or two extreme values are skewing the mean away from what's typical, which is often more diagnostic than either number alone.

Frequently asked questions

What's the difference between mean and median?

The mean (average) is the sum of all numbers divided by how many there are. The median is the middle value when the numbers are sorted — or the average of the two middle values if there's an even count. The median is less affected by extreme outliers than the mean.

How do I enter my numbers?

Separate them with commas, spaces, or line breaks — any combination works. For example, "4, 8, 15, 16, 23, 42" and "4 8 15 16 23 42" both parse the same way.

Is there a limit to how many numbers I can enter?

No practical limit — the calculation runs instantly in your browser, so you can paste in a long list without it slowing down.