Weighted Average Calculator
Calculate a weighted mean from values and their relative weights.
How to Use the Weighted Average Calculator
Enter each value together with its weight. The calculator multiplies each value by its weight, adds the products, and divides by the total weight.
Practical Example
If a score of 80 has a 40% weight and a score of 90 has a 60% weight, the weighted average is (80 × 40 + 90 × 60) ÷ 100 = 86.
Factors That Affect the Result
Weights must be applied consistently. Percentage weights do not have to total 100 if they are proportional, but missing or incorrectly assigned weights can distort the result.
Related Tools
Average Calculator · Geometric Mean Calculator · Harmonic Mean Calculator · Grade Calculator · Percentage Calculator
Frequently Asked Questions
Do weights need to total 100?
No. Any consistent proportional weighting system can be used.
Is weighted average the same as arithmetic mean?
No. A weighted average gives different importance to different values.
Can weights be decimals?
Yes, as long as they are entered consistently across all values.