To calculate the average of a set of values, add up all the numbers. The sum is then divided by the count of values.

**Add up all the values**Add up all the numbers that you have to get a summation of the entire set of values. For instance, if you have 2, 3, 5 and 6, the sum would be 16.

**Count the number of values**The next step is to count the number of values that you have. For the example specified in step one, the count would be 4.

**Apply the formula**Use the formula (average = sum/count) to obtain the average. For the previous example, the average would be (16/4 = 4).