Weighted Average Calculator
Paste a list of numbers and get the mean, median, mode, range, sum, min and max at once — or compute a weighted average with full steps.
Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
About this tool
This page opens the calculator directly in weighted average mode: enter one "value: weight" pair per line — like 80: 3 for a value of 80 that counts 3 times — and the weighted mean is computed with the complete working shown as a table.
The weighted average multiplies each value by its weight, sums those products, and divides by the sum of the weights: x̄ = Σ(value × weight) ÷ Σweight. For 80: 3, 90: 2 and 70: 1 that is (240 + 180 + 70) ÷ 6 = 490 ÷ 6 ≈ 81.67 — different from the plain mean of 80, because the weights shift the balance.
Weighted averages are everywhere: course grades with credit hours, final marks built from homework and exam percentages, portfolio returns weighted by position size, average prices weighted by quantity bought. The step table shows every value × weight product, so you can check each row against your source data before trusting the result.
Example. The numbers 1, 2, 2 and 5 give mean 2.5, median 2, mode 2, range 4, sum 10, min 1 and max 5.
Limit. Weighted mode rejects a negative weight and rejects a set whose weights sum to zero.