Sum of squares calculator

Calculate Σx² and the centered sum Σ(x − mean)² for your list.

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Sum of squares 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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Calculate Σx² and the centered sum Σ(x − mean)² for your list.

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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.

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Formula and assumptions

These are different statistics: the raw sum uses distance from zero; the centered sum uses distance from the mean. Up to 1,000 numbers.

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.

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Updated 2026-09-26

Using Sum of squares calculator

Calculate Σx² and the centered sum Σ(x − mean)² for your list.

These are different statistics: the raw sum uses distance from zero; the centered sum uses distance from the mean. Up to 1,000 numbers.

Next: Statistics calculator

A worked example

Example inputs: numbers = 1 2 3. Sum of squares = 14.

Before you use the result

These are different statistics: the raw sum uses distance from zero; the centered sum uses distance from the mean. Up to 1,000 numbers.

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