Weighted average calculator
Enter values and their weights, one pair per line, to get the weighted average.
Weighted average
How it works
weighted average = Σ(value × weight) ÷ Σ weightWorked example
- 88 × 20 + 76 × 30 + 92 × 50 = 8,640
- 20 + 30 + 50 = 100
- 8,640 ÷ 100 = 86.4
Frequently asked questions
What is a weighted average?
An average where some values count more than others. Each value is multiplied by its weight, and the sum is divided by the sum of the weights.
Do the weights have to add up to 100?
No. Weights of 1, 2 and 3 work the same as 16.7%, 33.3% and 50%: the calculator divides by their total.
Where is it used?
Course grades (homework 20%, tests 50%, final 30%), average purchase prices of shares, survey scores, and portfolio returns.