Calculate an exact weighted mean from value/weight pairs and review each row’s contribution.
Your inputs stay on your device. All calculations run in your browser without uploading, storing or tracking the numbers you enter. Clear formulas and visible assumptions let you review the estimate.
Weighted mean = sum(value × weight) / sum(weights).
Values may be signed; weights cannot be negative and their total must be positive. Weights need not total 100. Zero-weight rows are allowed.
Decimal arithmetic uses exact fractions. Currency displays round to two decimals; exact unrounded values are included where relevant. Date calculations use whole Gregorian calendar days. Results are estimates under the stated assumptions.
No. Inputs are processed locally and not persisted. Only the theme preference is stored. Copy and report downloads happen when you choose them.
