Weighted Average Calculator

About this calculator

A weighted average multiplies each value by its own weight, sums those products, and divides by the total of the weights — Σ(value × weight) ÷ Σ(weight) — instead of treating every number as equally important the way a plain average does. This calculator handles up to three value/weight pairs at once.

It's the method behind a course grade where exams count more than homework, a portfolio's blended return when positions are different sizes, or an inventory's average cost when purchase batches arrived at different prices and quantities. Students checking a final grade, analysts blending returns, and shop owners costing stock all rely on this instead of a simple mean because ignoring the weights would give a misleading answer.