Average Calculator

A list goes in; five summaries come back

Paste or type a list of numbers and SnakTool returns more than the arithmetic mean. The same pass through the data also gives the sum, number of values, smallest value, and largest value.

That makes the result easier to audit. If the calculator says the count is 6 when you expected 5, or the minimum is 0 when no zero belongs in the dataset, the supporting outputs can reveal an input problem before you rely on the mean.

The arithmetic mean is sum divided by count

For values x1 through xn, the arithmetic mean is (x1 + x2 + ... + xn) / n. Every entered observation contributes once and receives the same weight.

For 12, 18, 21, 24, and 30, the sum is 105 and the count is 5, so the mean is 21. The same calculation also reports 12 as the minimum and 30 as the maximum.

Input

12, 18, 21, 24, 30

Method

Sum = 105 · Count = 5 · 105 / 5

Result

Mean 21 · Minimum 12 · Maximum 30

Read the mean together with the range of values

Two lists can have the same mean and still look very different. The values 8, 10, and 12 average to 10; so do 0, 10, and 20. The second list is spread much farther apart.

SnakTool does not calculate variance or standard deviation, but its minimum and maximum give immediate context around the mean. They are especially useful for spotting a value that sits far outside the rest of a small list.

An outlier can pull the average toward it

Because every value enters the sum, one unusually large or small observation can move the arithmetic mean substantially. For 10, 11, 12, 13, and 100, the mean is 29.2 even though four of the five values lie between 10 and 13.

That does not make the calculation wrong; it means the mean answers a specific question about the total divided equally across all observations. When resistance to extreme values matters, a statistic such as the median may describe the center differently, but this tool does not calculate it.

Commas and spaces separate values — they do not format them

You can separate observations with commas, spaces, tabs, or line breaks. Signed numbers, decimals, and scientific notation such as -2.5 or 1e3 are accepted when each token is a valid finite number.

A comma is always treated as a separator. That means 1,000 is read as two values, 1 and 000, rather than one thousand. Enter 1000 when you mean a single value of one thousand. An empty list or an invalid token is rejected instead of being silently ignored.

Not every calculation called an average is this average

This calculator computes the unweighted arithmetic mean. It does not calculate a weighted average, median, mode, geometric mean, harmonic mean, moving average, or percentage average.

Repeating a value in the input makes it count again, but that is not a dedicated weighted-average interface. If observations have explicit weights, frequencies, credits, or different sample sizes, those weights need a calculation designed for that structure rather than an assumption made by this page.