Average Calculator

How it is calculated

The tool computes the arithmetic mean: mean = (x₁ + x₂ + … + xₙ) / n, where each x is a value in your list and n is how many values there are. It also reports n (the count) and the sum. You can separate the numbers with commas, semicolons, spaces or new lines, in any mix. Any entry that is not a valid number is silently ignored and not counted, so check that the count matches what you expected. Negative numbers and decimals written with a dot are accepted. If no valid number is found, no result is shown. The mean is pulled by extreme values; the median or mode may describe a typical value better when the list has outliers. Results are rounded to two decimals.

Common mistakes

• Typing a decimal comma in a list separated only by commas: 7,5 is read as two values, 7 and 5. Use a dot (7.5), or separate the values with spaces or semicolons, where a comma between digits counts as a decimal point (7,5 8 → 7.5 and 8).
• Not checking the count after pasting a list; text such as "n/a" or units glued to a number ("85kg") are skipped, so n comes out smaller than expected.
• Averaging averages. If groups have different sizes, the mean of group means is not the overall mean; enter the raw values instead.
• Using the mean for skewed data such as salaries or prices, where one very large value drags it far above the typical case.