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Weighted Average Calculator
The average when some values count for more than others, such as graded coursework.
Result…
How it's calculated
weighted average = Σ(xᵢ × wᵢ) ÷ Σwᵢ
Each value counts in proportion to its weight, so weights do not need to add to 100: credits, quantities or percentages all work. Use it for grade averages, average prices paid across several purchases, or portfolio returns weighted by amount invested.
Your numbers, step by step
More in Statistics & Probability
σStandard deviationHow spread out your numbers are around their mean, for a sample or a whole population.Top 100 · #59Open →s²VarianceThe average squared distance of your numbers from their mean.Top 100 · #60Open →PProbabilityThe chances of both, either, or neither of two independent events happening.Top 100 · #61Open →nCrCombinationsHow many ways to choose r items from n when the order does not matter, exactly.Top 100 · #62Open →nPrPermutationsHow many ordered arrangements of r items can be taken from n, exactly.Top 100 · #63Open →CIConfidence intervalThe range that likely holds the true mean, from a sample mean, standard deviation and size.Top 100 · #64Open →