Calculate an average or a weighted average
Enter your values and find their average. Choose weighted average if the values should count differently in the calculation.
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When all values count equally
A simple average is found by adding all the values together and dividing the sum by the number of values. Each number counts equally. It can be used to summarize a series of measurements or find an average value for several observations.
Enter the values separated by semicolons or spaces. Make sure the numbers describe the same kind of quantity if the result should have a common unit. An average of lengths, for example, only makes sense when the lengths are expressed in a common unit.
When the values have different weights
In a weighted average, each value is multiplied by its weight. The products are added together, and the sum is divided by the sum of the weights. A value with a larger weight affects the result more than a value with a smaller weight.
The method is useful when one number represents more observations than another. The choice between a simple and a weighted average therefore depends on how your data should count. The average does not in itself say how much the individual values vary, so also look at the numbers behind the result.
Example with three values
The numbers are 2, 4 and 9. First the sum is calculated: 2 + 4 + 9 = 15. There are three values, so the sum is divided by 3: 15 / 3 = 5. The full working is (2 + 4 + 9) / 3 = 5. All three numbers have the same weight in this example.