Weighted Average Calculator
Calculate a weighted average from matching value and weight lists.
Calculations run in this browser. Values are not submitted to the server.
Result
Formula and assumptions
Weighted average = sum(value × weight) ÷ sum(weights). Lists must be the same length and total weight cannot be zero.
Example values are shown in the input placeholders. Results use browser number precision unless the tool uses exact integer arithmetic. Check units and assumptions before using a result.