For example if your test average is 882 percent and is weighted 45 percent the points for your overall grade out of 100 would be 3969 which is 882 x 045. Weighted grade w1 g1 w2 g2 w3 g3. To calculate the percentile test score all you need to do is divide the earned points by the total points possible.
Percentage score total - wrong total.
Calculate the total number of percentage points that are actually earned. These are the numbers in the right hand column of the above chart. This free grade calculator can calculate a weighted average grade. In other words divide the number you wrote below the first column by the number you wrote below the second column.