Average calculator

Type a list of numbers to find the average, total, and how many numbers you entered.

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Formula and steps included

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Optional learning Learn how this math works See the formula, definitions, and step-by-step method.

Formula

The arithmetic mean formula

Arithmetic mean = (x₁ + x₂ + ... + xₙ) / n

The arithmetic mean, usually called the average, gives every entered value equal weight. Add the values and divide by how many values were included.

An average describes the center of a list but not how far apart its numbers are. One unusually high or low number can move the average away from most of the list.

How to use the formula

List and count the numbers
Type every number that should count, then count how many numbers are in the list.
Add the values
Find the sum, keeping negative signs and decimal places with their numbers.
Divide the sum by the count
The answer is the average, also called the arithmetic mean.

Worked examples

Average calculator examples

Average four scores

The average of 78, 84, 91, and 87 is (78 + 84 + 91 + 87) / 4 = 340 / 4 = 85.

Average monthly costs

The average of 42.50, 38.00, and 45.50 is 126 / 3 = 42.

Common questions

Average calculator FAQ

Is the average the same as the median?

Not always. The mean adds every value and divides by the count, while the median is the middle value after sorting. Outliers usually affect the mean more.

Do repeated numbers count more than once?

Yes. Each number you enter counts once, so a repeated number counts each time it appears.

Can an average include negative numbers and decimals?

Yes. Add negative numbers and decimals normally, then divide the total by the number of observations.

Is my list saved or uploaded?

Your list stays in your browser and is not saved by default or uploaded. Use Save on this device to keep it here, or download a backup file.