Weighted Average Calculator Guide: Formula & Worked Example
Short answer
Average of values with weights (grades, scores, prices). In the fixed example below, weighted average is 83. Your answer depends on the inputs and assumptions you choose.
Formula
Result = Weighted Average Calculator calculation using values, weights
The inputs are values, weights. Use the input scale shown beside each field and keep time periods and units consistent. Only round the final result for display.
Worked example
- Values
- 90, 80, 70
- Weights
- 50, 30, 20
- Weighted average: 83
- Simple average: 80
Understanding the result
Average of values with weights (grades, scores, prices). Start with the base example, then replace each value with the figure that matches your situation.
Values
The example uses 90, 80, 70 for values. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
Weights
The example uses 50, 30, 20 for weights. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
What the comparison means
The base scenario lists the selected inputs and their resulting output. Change the selections in the calculator to compare another scenario.
Check units, date boundaries and rounding before using the answer in a report or a practical measurement.
Comparison
| Scenario | Input | Result |
|---|---|---|
| Base example | Values: 90, 80, 70; Weights: 50, 30, 20 | Weighted average: 83 |
Common mistakes
- Using the wrong units for values.
- Comparing results while changing more than one input at a time.
- Check units, date boundaries and rounding before using the answer in a report or a practical measurement.
Checklist
- Confirm values.
- Confirm weights.
- Check the result against your source or provider.
Calculators Percentage Editorial Team
Calculator guides from the Calculators Percentage team. These introductory examples are educational, not professional advice.
Last reviewed:
Check units, date boundaries and rounding before using the answer in a report or a practical measurement.