Weighted Average Calculator
A weighted average gives some numbers more say than others. A final grade where the exam counts for more than the homework is a common example.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Multiply each value by its weight, add those results together, then divide by the total of the weights. A weight of 0 leaves that value out.
The weights can be any positive numbers, such as percentages, counts or hours, as long as they measure the same kind of importance.
Worked example
With the four values and weights shown, the weighted average comes to 78.64.
Questions
Do the weights have to add up to 100?
No. The calculator divides by the total of the weights, so any numbers work. Weights of 3 and 2 give the same answer as 30 and 20.
How is this different from a plain average?
A plain average gives every value the same weight. Here a bigger weight pulls the answer closer to that value.
Can I use more than four values?
This version takes four. For a longer list, multiply each value by its weight in a spreadsheet, add those up, and divide by the total weight.
More like this
- Average CalculatorMean of a list of numbers.
- Average Percentage CalculatorAverage of several percentages, weighted or not.
- Percent Change CalculatorPercent up or down between two numbers.
- Percent Difference CalculatorGap between two values, as a share of their average.
- Standard Deviation CalculatorSpread of a list of numbers.
- Ratio CalculatorSimplify a ratio or find a missing term.