Average Calculator

Formula

How this is calculated

This tool computes the arithmetic mean, the most common type of average. You enter a list of numbers separated by commas, spaces, or new lines; the calculator parses each entry, discards anything that is not a valid finite number, and keeps the rest as your data set. The numbers can be integers or decimals, positive or negative, and there is no unit assumption — the result is reported in whatever units your inputs are in.

The core step adds every value together to get the sum, then divides that sum by the count of values. Because every number contributes equally to this total, the arithmetic mean is sensitive to outliers: one unusually large or small value can pull the result noticeably. Alongside the mean, the tool also reports the count, sum, smallest value (min), and largest value (max) so you can sanity-check the spread.

A few edge cases: the mean is undefined when no valid numbers are entered (division by zero), so the result shows as blank until at least one number is present. The displayed mean is rounded to four decimal places for readability, while the underlying calculation uses full precision. Note this is the mean only — it is not the median (middle value) or mode (most frequent value), which can differ for skewed data.