x̄

Math calculator

Average Calculator

Add a list of numbers and divide by how many you entered to get the arithmetic mean.

ValueRemove
Arithmetic mean17
Sum51
Count3

FormulaMean = Sum of values ÷ Count of values
Calculation steps
  1. Sum = 12 + 18 + 21 = 51
  2. Count = 3
  3. 51 ÷ 3 = 17

On this device

History and favorites

History and favorites stay in this browser. They are not sent to KE Calculator. At most 20 history items are kept.

Recent results

Copy a result or share URL to save it here.

Favorite calculators

Save a calculator to open it quickly later.

How it works

How to use this average calculator

  1. Enter one number per row. Blank rows are skipped.
  2. Add or remove rows so the list matches your data.
  3. Read the mean, the sum, and the count.

Formula

The calculation formula

Mean = Sum of values ÷ Count of values
01

Add every non-empty number in the list.

02

Count those numbers.

03

Divide the sum by the count.

Worked examples

Example calculations

Three measurements

12, 18, and 21 sum to 51. 51 ÷ 3 = 17.

Blank rows are ignored

10, a blank row, and 20 use only two values. The mean is 15.

When to use it

Common use cases

  • Average a set of test scores or measurements
  • Check a simple dataset before applying weights
  • See sum and count beside the mean

Limits

Assumptions and limits

  • This is the unweighted arithmetic mean, not a median, mode, or weighted mean.
  • Blank rows do not count. A row with text is rejected instead of treated as 0.
  • At least one finite number is required.

Questions

Frequently asked questions

Does an empty row count as zero?

No. Empty rows are ignored so you can leave spare slots. Type 0 if you want zero included.

When should I use a weighted average instead?

Use the Weighted Average Calculator when some values should count more than others, such as credits or sample sizes.

Sources

Sources and review