Standard weighted mean
Computes Σ(value × weight) ÷ Σ(weight), the definition used in stats, finance, and gradebooks.
Tools / Weighted Average Calculator
Weighted Average Calculator
Enter each value and its weight. Get the weighted mean instantly, plus a simple average for comparison.
Weighted average = Σ (value × weight) ÷ Σ weight
Enter values to see the result
- 1
Add value and weight pairs
Each row is one data point and how much it should count.
- 2
Use any positive weights
Percents, credits, dollars, or counts are fine. They are normalized automatically.
- 3
Compare to a simple mean
See how weighting shifts the result versus treating every row equally.
Why use a weighted average
When some numbers matter more than others, an equal mean is the wrong answer.
Flexible weights
Weights do not need to sum to 100. Relative importance is what matters.
Side-by-side simple average
Shows the unweighted mean so you can see the effect of the weights.
When to use a weighted average
Grades and credits
Average course grades weighted by credit hours, or category scores by syllabus weight.
Portfolio returns
Blend asset returns by allocation size.
Survey and ratings
Weight scores by response counts or sample sizes when pooling groups.
Weighted average formula
Weighted average = Σ (value × weight) ÷ Σ weight
If every weight is equal, this reduces to the ordinary arithmetic mean. The tool also reports that simple average for comparison.
Weighted average vs class grade tool
Weighted average
- Any values and weights
- Finance, surveys, GPA credits
- Compares to simple mean
Class grade calculator
- Scores as course percentages
- Letter grade and GPA points
- Built for syllabus weights
Related calculators
Frequently asked questions
What is a weighted average?
A weighted average multiplies each value by a weight, sums those products, and divides by the sum of the weights.
It is the right mean when some observations should count more than others.
Do weights have to add up to 100?
No. Use percentages, fractions, credit hours, or any positive numbers. The calculator divides by the total weight.
When should I use a simple average instead?
When every value is equally important (same credits, same sample size, same allocation). If importance differs, use weights.
Can I calculate GPA with this?
Yes. Enter grade points (for example 4.0, 3.7) as values and credit hours as weights. The weighted average is your GPA.
For a single class from assignment percentages, use the class grade calculator.
Are my numbers stored?
No. Everything runs locally in your browser.
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