Weighted Average Calculator
Average where some inputs matter more.
Weighted average
85.70
Simple average for comparison: 85.75
Math
Σ(value × weight) ÷ Σ(weight) = 85.70
Total weight: 100. Weights don't need to sum to 100; the formula normalizes them.
Use this for grade weighting, blended portfolio returns, weighted star ratings, or any time some inputs matter more than others. The values stay on the same scale; only the relative weights matter.
About
Add as many items as you want, each with a value and weight. Get the weighted average: Σ(value × weight) ÷ Σ(weight). Compare against the simple average. Useful for grades, blended portfolio returns, or any custom weighted score.
How to use
- Add items with value and weight.
- Read the weighted average.
FAQ
Do weights have to sum to 100?+
No. The formula normalizes by the sum of weights, so 30/70 and 3/7 give the same answer. Use whatever makes sense for your data.