Weighted Average Calculator
Calculate weighted average with custom weights
How to Calculate Weighted Average
Enter Values
Input your data values separated by commas (e.g., 80, 90, 75).
Enter Weights
Input corresponding weights for each value, also comma-separated.
Get Weighted Average
Click calculate to see the weighted average and total weights.
Key Features of This Weighted Average Calculator
**Simple Input Format**
Enter values and weights as comma-separated lists for quick calculation.
**Any Number of Items**
Calculate weighted averages for any number of value-weight pairs.
**Accurate Formula**
Uses Σ(value × weight) / Σ(weights) for mathematically correct results.
**Educational Tool**
Perfect for students learning statistics and weighted calculations.
Frequently Asked Questions
What is a weighted average?
A weighted average gives different importance (weights) to different values. It's calculated by multiplying each value by its weight, summing those products, then dividing by the sum of weights.
When should I use weighted average?
Use weighted averages when some values matter more than others - like GPA (credits as weights), portfolio returns (investment amounts), or graded assignments (point values).
How is weighted average different from regular average?
A regular average treats all values equally. A weighted average gives more influence to values with higher weights. If all weights are equal, weighted average equals regular average.
Do weights need to add up to 1 or 100%?
No! Weights can be any positive numbers. The formula automatically normalizes by dividing by the sum of weights. Using percentages is optional.
Can weights be zero or negative?
Weights should be positive. A zero weight effectively excludes that value. Negative weights don't make sense for typical weighted average applications.
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