Weighted Average Calculator
Calculate a weighted mean from CSV values and weights, with explicit handling of zero weights and invalid rows.
Start with your input
Edit the example or replace it with your own text.
Choose your options
These settings are optional. Keep the defaults to get started.
How to use Weighted Average Calculator
- Load the example or enter your own values.
- Choose the relevant options and run the tool.
- Review the result, then copy it or download a local file.
Calculate a mean when contributions differ
A simple average gives every entry equal influence, which can misrepresent a dataset with different counts or importance weights. Paste a CSV table and choose the value and weight columns to calculate a weighted mean. This can help verify an educational exercise, combine summarized measurements or check a small reporting formula. The example combines three scores with different contribution weights.
Check weights and numeric precision
Every row needs a finite numeric value and a nonnegative finite weight. Zero-weight rows do not affect the result and are counted separately. At least one weight must be positive. The result includes total weight and weighted sum so the calculation can be inspected. Values and weights are parsed as plain decimal or exponent notation without currency symbols or grouping commas. Arithmetic uses JavaScript floating point and rejects overflowing totals; displayed results are rounded to twelve significant digits.
Example input
value,weight 80,2 90,3 70,1
Can all weights be zero?
No. At least one weight must be positive; negative weights and missing numeric cells are rejected.
Is input uploaded?
Processing takes place in your browser. This tool does not send your input or selected files to a conversion API.