Formula and method
Weighted mean = Σ(value × weight)/Σweight. At least one weight must be positive.
Worked example
Values 80, 90 and 70 weighted by 20, 50 and 30 give (1600 + 4500 + 2100)/100 = 82.
Weighted Average Calculator
Compute an average from values and matching nonnegative weights, without requiring weights to sum to 100.
Printed from Calxy · https://www.calxy.net/math/weighted-average-calculator
Weighted average82.0000
Weighted average
82.0000
- Total weight100.0000
- Number of values3
Weights can be counts, percentages or relative importance; they do not need to sum to 100. Zero weights contribute nothing.
How this was calculated
Multiply every value by its corresponding weight.
Divide the sum of those products by total weight.
Frequently asked questions
Can a weight be zero?
Yes. A zero-weight value contributes nothing. Negative weights are excluded from this ordinary weighted-average tool.
Last updated . Results are estimates for informational purposes only.