Standard Deviation Calculator
Calculate standard deviation and variance for both population (σ) and sample (s) datasets. Enter a list of numbers and instantly see mean, variance, and standard deviation. Useful for statistics, quality control, finance, and data science.
Standard Deviation Calculator
2.000000
Std Deviation
4.000000
Variance
5.0000
Mean
8
Count (n)
How to Use Standard Deviation Calculator
- 1Enter dataset numbers
- 2Choose population or sample
- 3View standard deviation and variance
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Standard Deviation Calculator runs entirely in your browser. Your files and data are never uploaded to any server, never stored, and never shared. Everything happens locally on your device using secure browser APIs.
No server uploadNo account required100% freeWorks on all devices
Frequently Asked Questions
What is the difference between population and sample standard deviation?
Population SD uses n in the denominator; sample SD uses n-1 (Bessel's correction), giving a slightly larger value to correct for sampling bias.
Why Use This Tool?
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No upload to any server
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Tags
standard deviation calculatorvariance calculatorstatisticssigma calculatordata spread
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