Weighted Average Calculator
Averages where some values count more than others.
Enter your values
ⓘ Live results
Results
- Weighted average
- 89.5
- Simple average
- 88.5
- Total weight
- 100
- Difference from simple average
- 1
| Value | Weight | Weight % | Contribution |
|---|---|---|---|
| 88 | 20 | 20% | 17.6 |
| 92 | 30 | 30% | 27.6 |
| 79 | 20 | 20% | 15.8 |
| 95 | 30 | 30% | 28.5 |
Quick answer
A weighted average multiplies each value by its weight, sums the results and divides by the total weight.
x̄w = Σ(wᵢxᵢ) ÷ Σwᵢ
How to use the Weighted Average Calculator
- 1Enter your values in order.
- 2Enter matching weights in the same order.
- 3Read the weighted average and each contribution.
Worked example
Using the values the calculator loads with:
Inputs
- Values (comma separated)88, 92, 79, 95
- Weights (comma separated)20, 30, 20, 30
Results
- Weighted average89.5
- Simple average88.5
- Total weight100
- Difference from simple average1
Frequently asked questions
Do weights need to sum to 100?
No. Any consistent scale works because the calculation divides by the total weight.
Where is this used?
Course grades, portfolio returns, survey results and any scoring system where components have different importance.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.