What is the Weighted Average Calculator?
Calculate a weighted average from values and their weights. Paste a list of numbers from any spreadsheet or document and get descriptive statistics instantly. Each statistics calculator also charts your data so outliers stand out.
How to use the Weighted Average Calculator
- Enter your values, your weights.
- Results update automatically as you type; you can also press Calculate.
- Read the output: weighted average, simple average.
- Use the 📊 chart to see the result visually, then copy or share it.
Formula and method
Worked example
With values = 90, 85, 78, weights = 0.3, 0.3, 0.4, the Weighted Average Calculator returns weighted average: 83.7; simple average: 84.3333333333.
Tips for better results
- Use sample standard deviation (n − 1) for samples and population (n) for complete data sets.
- Check the chart for outliers before trusting a mean.
- Quartiles here use the inclusive interpolation method, matching Excel’s QUARTILE.INC.
Frequently asked questions
What does the Weighted Average Calculator do?
Calculate a weighted average from values and their weights.
How is it calculated?
The Weighted Average Calculator uses this method: Weighted mean = Σ(value × weight) ÷ Σweight.
Can you show an example?
With values = 90, 85, 78, weights = 0.3, 0.3, 0.4, the Weighted Average Calculator returns weighted average: 83.7; simple average: 84.3333333333.
Is the Weighted Average Calculator accurate?
Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.
Is this tool free and private?
Yes — the Weighted Average Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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