Spread · z-scores · empirical coverage

Standard Deviation Calculator

Calculate standard deviation from raw values, a frequency distribution, or sufficient summary statistics—and compare two datasets side by side. Exact variance and sum-of-squares math stay visible.

Use as

Spread result

Interpretation & diagnostics

Value	Frequency	Deviation	z-score

Exact derivation

OneFreePlace · Free, private standard deviation analysis · Tool #493