Weighted Average Calculator
Calculates averages where items count differently, like weighted exam components.
Result
- Weighted average
- 81.6
How to use the weighted average calculator
- Enter the values.
- Enter the weights.
- The results update as you type, or press Calculate.
- Read the weighted average first, then the supporting figures below it.
Formula
Weighted mean = Σ(value × weight) ÷ Σweight.
Worked example
For example, with these inputs:
- Values: 80, 72, 90
- Weights: 30, 30, 40
the calculator returns:
- Weighted average: 81.6
Background
Rounding is a common source of small errors. Keep full precision during intermediate steps and round only the final answer to the number of decimal places or significant figures the question asks for.
In everyday life the same maths shows up in discounts, recipe scaling, renovation measurements and comparing prices per unit. Being comfortable with it saves money and avoids costly measuring mistakes.
Frequently asked questions
How does the weighted average calculator work?
It applies this formula: Weighted mean = Σ(value × weight) ÷ Σweight.
Can I use any units?
Yes, as long as every input uses the same unit. The answer will be in that unit (squared for areas, cubed for volumes).