Weighted Average Calculator
Calculate the weighted mean of values and weights
A weighted average accounts for the fact that some values matter more than others. Enter your values along with a weight for each, and the calculator gives you the overall average.
Enter values and their weights. The weighted mean = Σ(value × weight) ÷ Σ(weights).
Weighted Average
81.6667
Total Weight
6
How to Use This Calculator
- Enter your first value and its weight.
- Add more rows for each additional value.
- Remove any rows you don't need.
- Read the weighted average and the total weight.
Why Use This Calculator?
- Calculating a grade where assignments are worth different percentages.
- Averaging prices when you bought different quantities at different prices.
- Combining ratings or scores by importance.
Real-World Examples
Grades 80, 90, 70 with weights 3, 2, 1
The weighted average is (80×3 + 90×2 + 70×1) ÷ 6 ≈ 81.67.
How it differs from a plain average
A plain average treats every value equally. A weighted average multiplies each value by its weight, adds those up, and divides by the total weight — so bigger weights pull the result toward their value.
Frequently Asked Questions
What should I use as the weight?
Whatever reflects importance: credit hours for grades, units bought for prices, or the share each item represents.
Can weights be decimals?
Yes. Weights just need to be numbers; they don't have to be whole numbers or add to any particular total.
What if a weight is zero?
That value is ignored (multiplied by zero). Just make sure the total weight isn't zero, or the average is undefined.
Important Disclaimer
Results are exact for the values and weights entered.
Privacy
Your entries stay in your browser and aren't stored or transmitted.
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