Average Calculator
Average a list of numbers and see the mean, sum, count, minimum and maximum at once.
How it works
average = sum of the values ÷ how many values
The everyday average, or arithmetic mean, adds every value together and divides by how many there are — it marks the single balance point of the data. This calculator also reports the sum, count and the smallest and largest values so you can see the spread at a glance. It handles any mix of whole numbers and decimals, positive or negative.
Worked example
For 10, 20, 30, 40 and 50: the sum is 150 and there are 5 values, so the average is 150 ÷ 5 = 30. The smallest value is 10 and the largest is 50.
Frequently asked questions
Is the average the same as the mean?
In everyday use, yes — “average” almost always means the arithmetic mean: add the values and divide by how many there are. The median and mode are other kinds of average kept for special cases.
How do outliers affect the average?
A single very large or very small value pulls the mean toward it. When your data has extremes, the median often describes the typical value better than the mean does.
Can I average numbers that are themselves averages?
Only if each represents the same number of items. Averaging the averages of different-sized groups gives the wrong answer — you need a weighted mean that accounts for each group’s size.
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This calculator is for educational purposes. Double-check important results before acting on them.