Weighted average calculator

Average values that contribute different amounts.

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Weighted average calculator processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

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Spaces separate values; 1,000 is one value.

Values

Matching weights

Answer

…

Weighted average = sum of each value × its weight ÷ total weight.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Saved scenario

Save the current answer, then change an input to compare. This clears when you leave.

Formula and assumptions

Enter paired lists with the same length. Weights may be counts, relative weights or percentages; they do not have to sum to 100. Negative weights are not used.

In a list, use spaces, new lines, semicolons, or commas followed by a space. A comma between groups of three digits is a thousands separator.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

Scratch calculator

Check another calculation

Use +, −, ×, ÷, parentheses and %. A percentage is divided by 100. This does not change the main tool.

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Links include your inputs and settings. Anyone with the link can see them, so leave out private text. Files and generated results are left out; random draws run again.

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Updated 2026-09-26

Using Weighted average calculator

Weighted average = sum of each value × its weight ÷ total weight.

Enter paired lists with the same length. Weights may be counts, relative weights or percentages; they do not have to sum to 100. Negative weights are not used.

Next: Statistics calculator

A worked example

With values = 80 90 100, matching weights = 1 2 1, the weighted average is 90.

Next: Geometric mean calculator

Before you use the result

Enter paired lists with the same length. Weights may be counts, relative weights or percentages; they do not have to sum to 100. Negative weights are not used.

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ToolOctopus. “Weighted average calculator.” Updated 2026-09-26. https://tooloctopus.com/weighted-average-calculator.

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