An average percentage combines two or more percentage values into one summary number. It is useful for grades, survey results, sales performance, completion rates, and business reports.
Use the Percentage Calculator when you need to calculate each percentage first. Then decide whether a simple average or weighted average is correct.
Simple average percentage
If each percentage has the same importance, add the percentages and divide by the number of values. For example, 80%, 90%, and 100% average to 90%.
Weighted average percentage
If the percentages represent groups of different sizes, use a weighted average. A small group and a large group should not always count the same.
Grade example
If homework is 20% of your grade and exams are 80%, exams should carry more weight in the final average. For school scores, the Grade Calculator can help with weighted results.
Common mistake
Do not average percentages blindly when the underlying totals are different. Always check whether each percentage represents the same number of items, people, dollars, or points.