A weighted mean gives some values more influence than others — useful for grades weighted by credit hours, portfolio returns weighted by investment size, or survey scores weighted by respondent count. Enter your values and weights below.
Weighted Mean Calculator
How to Use the Weighted Mean Calculator
- Enter each value you want to average.
- Enter the weight for that value (how much it should count relative to the others).
- Click "+ Add Another Value" if you have more than three data points.
- Click "Calculate Weighted Mean" to see your result.
How the Weighted Mean Is Calculated
Unlike a simple average, a weighted mean accounts for the relative importance of each value:
Weighted Mean = Σ(Value × Weight) ÷ Σ(Weight)
For example, if a 3-credit class earned a 90 and a 4-credit class earned an 80: (90×3 + 80×4) ÷ (3+4) = 590 ÷ 7 ≈ 84.3 — notice this differs from a simple average of 85, because the 4-credit class counts more.
Frequently Asked Questions
When should I use a weighted mean instead of a regular average?
Use a weighted mean whenever some data points should count more than others — like grades weighted by credit hours, or survey results weighted by sample size.
What happens if all my weights are equal?
A weighted mean with equal weights produces the same result as a simple average — the weighting only changes the outcome when weights differ.
Can weights be percentages instead of whole numbers?
Yes — the formula works the same whether your weights are percentages, credit hours, or any other proportional measure, as long as you're consistent.
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Disclaimer: This calculator provides general mathematical results based on the values you enter. Always double-check inputs for accuracy, especially for academic or financial calculations.
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