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Exact Weighted Average Calculator
Calculate an exact rational weighted mean with every normalized weight and contribution.
Admitted integer or rational text fields
weighted-average.json
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter the admitted values using the labeled input fields.
- Choose the explicit operation and options, then inspect the stated conventions and limits.
- Select Calculate weighted average and download weighted-average.json.
Examples
The pairs 90,2 and 80,1 give an exact weighted mean of 260/3.
Limitations
- At most 100 pairs and 16 KiB input; 12 digits per integer numerator/denominator, nonnegative weights and a positive total. Decimal/exponent input refuses. Expanded complete reports above 64 KiB refuse before download.
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