Find an average where some values count more. This free weighted average calculator multiplies each value by its weight and divides by the total weight — ideal for grades, GPA and prices.
Values & weights
ValueWeight
Enter each value and its weight (importance). The weighted average multiplies each value by its weight, sums them, and divides by the total weight. Weights can be percentages, credits, counts — anything.
Weighted average
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Add some values
Total weight
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Σ (value × weight)
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Number of items
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Plain average
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A weighted average gives more influence to items with higher weights. If all weights are equal, it equals the ordinary (plain) average.
Use this free weighted average calculator to find an average where some values matter more than others. Enter each value and its weight, and it returns the weighted mean.
What this weighted average calculator does
A weighted average calculator finds a mean that accounts for the importance (weight) of each value. It multiplies each value by its weight, adds those products, and divides by the total weight — so higher-weighted items pull the average toward them.
How a weighted average is calculated
Weighted average = Σ(value × weight) ÷ Σ(weight)
For grades of 90, 80 and 70 with weights 0.5, 0.3 and 0.2: (90×0.5 + 80×0.3 + 70×0.2) ÷ 1 = 83 — higher than the plain average of 80, because the 90 counts most.
Where weighted averages are used
Use
Weight
Course grades
% each component is worth
GPA
Credit hours per course
Average price paid
Quantity bought at each price
Survey scores
Number of respondents
Weighted vs plain average
If every weight is the same, the weighted average equals the plain (ordinary) average. The difference only appears when weights vary — that’s when this calculator gives the answer a simple mean would miss.
How to use the weighted average calculator
Enter a value and its weight on each row.
Add more rows as needed.
Read the weighted average, total weight and plain-average comparison.
Weighted Average FAQ
How do I calculate a weighted average?
Multiply each value by its weight, add those products, then divide by the sum of the weights. For 90, 80, 70 weighted 0.5, 0.3, 0.2, the result is 83.
What's the difference from a normal average?
A normal average treats every value equally; a weighted average lets some values count more. They're equal only when all the weights are the same.
What can I use as weights?
Anything that reflects importance — percentages, credit hours, quantities, or counts of respondents. They don't have to add up to 1 or 100.
How do I calculate a weighted grade?
Use each assessment's score as the value and the percentage it's worth as the weight. The calculator returns your overall weighted grade.
Do the weights need to total 100%?
No. The calculator divides by whatever the weights add up to, so any positive weights work.
Is the weighted average calculator free?
Yes, this weighted average calculator is completely free, needs no sign-up, and gives instant results in your browser.
