Weighted Average Calculator
Calculate the weighted average (weighted mean) of values with different weights.
Useful for grades, investments, and surveys.
Weighted Average
Weighted average accounts for the importance (weight) of each value:
Weighted Average = Σ(value × weight) / Σ(weight)
Example — Course grades:
| Assignment | Grade | Weight |
|---|---|---|
| Homework | 92 | 20% |
| Midterm | 85 | 30% |
| Final | 78 | 50% |
= (92 × 20 + 85 × 30 + 78 × 50) / (20 + 30 + 50)
= (1840 + 2550 + 3900) / 100 = 82.9
Common uses:
- Academic grades — different assignments weighted differently
- Investment portfolio — weighted by amount invested
- Survey results — weighted by sample size
- Overall ratings — weighted by number of reviews
Enter values as: value, weight (one pair per line) Example: 92, 20