Standard Deviation CalculatorMath
Calculate dispersion and variance for your data set instantly.
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Drop file or paste textSample Std Dev (s)
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Enter at least 2 numbers
Sample Variance (s²)
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Mean (Average)
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Sample Size (n)
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Capabilities & How-To Guide
Instructions, supported options, and client-side privacy guarantee.
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Capabilities & How-To Guide
Instructions, supported options, and client-side privacy guarantee.
Show GuideHide Guide
Dispersion Analysis
Standard Deviation measures the amount of variation or dispersion in a set of values. Understand how spread out your data is relative to the mean.
Sample Variance
Our tool uses Bessel's correction (n-1) to provide an unbiased estimate of the population variance from your sample data.
Common Applications
Investment Volatility Analysis
Scientific Research Reliability
Manufacturing Quality Control
Test Score Distribution
Biological Variation Studies
A/B Test Confidence Intervals
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