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Used by developers, writers, and creators worldwide.
A weighted average calculator finds the mean of a set of values when each value counts for a different amount. Enter your values and a matching list of weights, both comma separated, and it multiplies each value by its weight, divides by the total weight, and reports the weighted average alongside the plain unweighted average for comparison and the sum of the weights. Weighted means appear everywhere that some items matter more than others, including grade point averages where credits differ, course grades split across exams and assignments, portfolio returns weighted by holdings, and survey results adjusted for sample size. Students use it to predict a final grade, investors to combine returns, and analysts to summarise uneven data fairly. Because the weights need not sum to one, the tool normalises by the total weight automatically. Use it to compute any weighted mean clearly.
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How to use
- Choose your options above
- Click Generate
- Copy your result
Detailed instructions
- Enter your values separated by commas.
- Enter a matching list of weights.
- Click Generate to compute the weighted mean.
- Compare it with the plain average shown.
Use Cases
- •Calculating a grade point or course average
- •Combining exam and assignment scores by weight
- •Averaging portfolio returns by holding size
- •Adjusting survey results for sample size
- •Comparing a weighted mean against a plain mean
Tips
- →Weights can be percentages, credits, or raw counts.
- →They need not sum to one; the tool normalises them.
- →Keep the two lists the same length for clarity.
- →Compare the weighted and plain means to see the effect.
FAQ
do the weights have to add up to one
No. The tool divides by the total of the weights, so any positive weights work, whether they are percentages, credit hours, or counts. It normalises automatically, so 0.5, 0.3, 0.2 and 5, 3, 2 give the same result.
what if i have more values than weights
The tool pairs values with weights in order and uses only as many pairs as the shorter list allows, so a mismatch will not crash. Enter equal-length lists for the result you intend.
how does a weighted average differ from a plain one
A plain average treats every value equally, while a weighted average lets some values count more. The tool shows both so you can see how much the weighting shifts the result away from the simple mean.
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