Weighted average calculator
Combine values using non-negative weights. Weights are normalized automatically; they do not need to add up to 100.
| Value | Weight | Normalized weight | Contribution | Remove |
|---|---|---|---|---|
| 30% | 24 | |||
| 70% | 63 |
Sum of weights100
Weighted average87
Method and example
Weighted mean = Σ(value × weight) / Σ(weight). Values 80 and 90 with weights 30 and 70 give 87; weights 3 and 7 give the same answer. Each normalized weight is weight / total; its contribution is value × normalized weight.
Limits and privacy
Zero individual weights are allowed; all-zero or negative weights are rejected. Up to 100 rows. This is a weighted arithmetic mean, without conversion to letter grades. Results use floating-point arithmetic and display up to 8 decimal places. Inputs stay in page memory.