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Root Mean Square Calculator — Compute the RMS of a dataset. Enter Dataset (comma-separated) to get an instant, accurate result.

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RMS = √(Σx² / n), the square root of the average of the squared values.

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1. Enter the Dataset (comma-separated).
2. Click Calculate to see your result instantly.

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Example: With Dataset (comma-separated) = 1, 2, 3, the Root Mean Square Calculator gives Rms: 2.1602.

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What is RMS commonly used for?

It's widely used in engineering and signal processing to measure the magnitude of a varying quantity, such as AC voltage or current.

Is RMS always greater than or equal to the mean?

For non-negative values, yes — RMS is always greater than or equal to the arithmetic mean, with equality only when all values are identical.

What inputs does the Root Mean Square Calculator need?

You'll need to provide: Dataset (comma-separated). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.

How accurate is the Root Mean Square Calculator?

The Root Mean Square Calculator applies the formula exactly as calculated — RMS = √(Σx² / n), the square root of the average of the squared values. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.

Is the Root Mean Square Calculator free to use?

Yes, the Root Mean Square Calculator is completely free, requires no signup, and runs instantly in your browser.

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The Root Mean Square Calculator uses a real, verifiable formula — RMS = √(Σx² / n), the square root of the average of the squared values. — so results are accurate every time, not an approximation.