Standard Deviation Calculator
Compute standard deviation and variance for population or sample datasets instantly.
Results
Formula Used:
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About the Standard Deviation Calculator
What is Standard Deviation?
Standard deviation measures the amount of variation or dispersion in a set of values. A low standard deviation means values tend to be close to the mean, while a high standard deviation indicates values are spread out over a wider range.
How to Use
Enter your dataset as comma-separated numbers, select whether it is a sample or the entire population, and click Calculate. The tool returns count, sum, mean, variance, standard deviation, min, and max.
What is the difference between sample and population?
Population standard deviation uses N in the denominator and applies when your data includes every member of the group. Sample standard deviation uses N-1 and applies when your data is a subset of a larger population.
What formula does this calculator use?
Population: σ = �?Σ(x - μ)² / N). Sample: s = �?Σ(x - x̄)² / (N - 1)).
Can I use spaces in the dataset?
Yes. Spaces around commas are ignored, so you can format your data naturally.
Is this calculator free?
Yes, BestCalc's standard deviation calculator is completely free with no ads or registration required.