Weighted Average Calculator
Enter one value-weight pair per line (like a grade and its credit hours, or a score and its importance) to find the weighted average.
One pair per line, separated by a comma or space — for example, a grade of 90 worth 3 credits is "90, 3".
How a weighted average works
A weighted average multiplies each value by its weight, sums those products, and divides by the sum of the weights — giving more influence to values with larger weights. This is the standard way to combine grades with different credit hours, or scores with different importance.
The simple (unweighted) average is shown for comparison — it treats every value equally regardless of its weight, which is just the regular average of the values you entered.
Frequently asked questions
How is a weighted average different from a simple average?
A simple average treats every value equally; a weighted average gives more influence to values with higher weights, so a 90 worth 4 credits counts more than an 80 worth 1 credit.
What can I use the weights for?
Weights can represent anything that should matter more or less — course credit hours, exam importance, time spent, or any other factor that should scale a value's contribution to the average.
Does the order of the pairs matter?
No — the weighted average is the same regardless of what order you list the value-weight pairs in.