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Weighted Average Calculator

Calculate a weighted mean — for grades, ratings and portfolio returns.

To calculate a weighted average, enter your values and their matching weights, one per line. Weights are normalised automatically, so you can use raw figures such as credit hours or share counts without converting them to percentages first.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

When is a weighted average the right measure?

Whenever the values represent different amounts. A plain average of two exam scores treats a 10% quiz and a 60% final equally; a weighted average reflects what each is actually worth.

Must the weights add to 100?

No. Any positive numbers work, because the calculation divides by their total. Weights of 1, 2 and 3 give exactly the same result as 16.7%, 33.3% and 50%.

How to use the weighted average calculator

  1. 1Enter or paste your values (one per line).
  2. 2Enter or paste your weights (one per line).
  3. 3The result appears immediately — copy or download it.

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Put the working weighted average calculator on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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