ClarityHow to use this tool
- Enter values, matching weights.
- Select Calculate to view the result.
- Check the method and assumptions below before using the result.
Input reference and sample values
Use the units and choices shown for each field. Sample values are provided for practice, not as recommendations.
| Input | Format and units | Sample |
|---|---|---|
| Values | Keep the structure and separators shown in the sample. Line breaks are retained in this input. | 80, 90 |
| Matching weights | Keep the structure and separators shown in the sample. Line breaks are retained in this input. | 1, 3 |
Result for these sample inputs
87.5
- Total weight
- 4
- Pairs
- 2
Select Try the example in the form to load these values and calculate them again. This replaces the current form inputs. Compare the result with the method and worked explanation below.
The method, explained
Weighted mean = Σ(value × weight) ÷ Σweights. Match each value with the weight at the same position.
Scores of 80 and 90 with weights 1 and 3 have a weighted average of 87.5.
What to keep in mind
Weights must be nonnegative and at least one positive. Both lists must have the same length. Use a dot for decimals and no thousands separators.
Common questions
Must weights add up to 100?
No. Relative weights work; 1 and 3 give the same result as 25 and 75.
Can a value have zero weight?
Yes. It contributes nothing to the weighted sum but still needs a matching list position.
Methodology maintained by ClarityKit. How these tools are built and checked.