Weighted Average Calculator
Calculate a weighted average, where each value counts more or less toward the result depending on its assigned weight.
About the Weighted Average Calculator
A weighted average gives some values more influence over the result than others, based on a weight assigned to each one. It's the right tool whenever values shouldn't count equally — for example, a final grade where the exam counts for more than a single homework assignment.
Formula: Weighted Average = (Σ value × weight) ÷ (Σ weight)
Enter each value and its matching weight in the same order, separated by commas or spaces — the calculator multiplies each value by its weight, adds those products together, and divides by the total of the weights. The weights don't need to add up to any particular number, since they don't have to sum to 1 or to 100 — the formula automatically normalizes for whatever total you provide.
Weighted averages are used constantly in school grading systems, financial portfolio returns (weighted by investment size), survey analysis (weighted by sample representativeness), and GPA calculations, where credit hours act as the weight.