Average Calculator
The plain arithmetic mean of a list — sum divided by count — for whenever you need a quick average without pulling up a spreadsheet for a handful of numbers.
Inputs
Result
18.6
Sum 93 across 5 values
How the average calculator works
Mean = sum of all values ÷ number of values.
Every value in the list contributes equally, which is exactly what makes the mean sensitive to a single unusually large or small outlier.
Worked example: 12, 18, 24, 30, 9
- Sum = 12+18+24+30+9 = 93.
- Count = 5.
- Mean = 93 ÷ 5 = 18.6.
Common mistakes to avoid
Treating the mean as automatically representative
One extreme value can pull the mean well away from where most of the data actually sits — for skewed data, the Median & Mode Calculator often paints a more honest picture.
Including blank or non-numeric entries in the list
Stray text or empty items in a comma-separated list are dropped automatically before averaging, so double-check the count in the result matches how many numbers you intended to include.
Frequently asked questions
How is this different from the Statistics Calculator?
This is a fast single-purpose mean-only tool; the Statistics Calculator additionally reports median, mode and standard deviation from the same list.
Does order matter in the list I enter?
No — sum and count don't depend on order, so the mean comes out identical no matter how the numbers are arranged.
What if I need a weighted average instead of a plain one?
This tool treats every value equally; a genuinely weighted average (where some values count more than others) needs each value multiplied by its weight before summing, which isn't what this calculator does.
How are the numbers separated when I paste them in?
Commas, spaces, or a mix of both all work — the parser splits on either.
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