Sometimes all scores are not the same, which can be either an advantage or a disadvantage, depending on which scores count more. A weighted average score takes different scores, or grades, with assigned weights, or percentages. A common example of a weighted average score is the grade for a class that has different percentage points for homework, participation and test grades. Calculation of a weighted average score can show you what scores you have and what scores you need to receive.

Step 1

Multiply the scores with their respective percentages or weights. For example, you have one score of 70 that is 25 percent of your weighted score, a score of 85 that is another 25 percent and a score of 90 that is 50 percent. Multiply 70 by 25 to get 1,750, 85 by 25 to get 2,125 and 90 by 50 to get 4,500.

Step 2

Add the products from Step 1. For this example, 1,750 plus 2,125 equals 3,875, and 3,875 plus 4,500 equals 8,375.

Step 3

Divide that sum by the weighted amount. For this example, the weighted amount is 100 percent, so dividing 8,375 by 100 results in 83.75.