Standard Deviation Calculator
Calculate population or sample standard deviation with variance, mean, and distribution visuals.
Standard Deviation Calculator
Calculate population and sample standard deviation with variance
You can separate numbers with commas, spaces, or new lines
Learn The Concept
Go beyond the answer
Use the calculator for the result, then read the guide if you want the underlying rule, worked examples, and common mistakes.
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Standard Deviation Made Simple: What It Means and How to Calculate It
Learn what standard deviation measures, the difference between population and sample SD, and follow a step-by-step manual calculation with real-world examples.
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Mean, Median, and Mode: When to Use Each (With Examples)
Understand the three measures of central tendency, when each is most appropriate, and how outliers affect them — with worked examples and real-world scenarios.