Standard Deviation Calculator
Population and sample standard deviation and variance for a list you type.
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How to use Standard Deviation Calculator
- Enter numbers. Leave a field blank only when the page says the value is missing, not by typing 0 unless 0 is a real value.
- Read the result rows under the form. Errors appear in the status line. Nothing is uploaded.
- Rounding follows IEEE floating point in this browser unless the page says it uses integers or BigInt.
Standard Deviation Calculator
Population SD
| Computes | Population and sample standard deviation and variance for a list you type. |
|---|---|
| Includes | Population SD |
| Includes | Sample SD |
| Engine | stats |
| Upload | None |
| Advice | Arithmetic only |
What Standard Deviation Calculator is
Variance is the mean of squared deviations from the mean. Population divides by n. Sample (Bessel) divides by n − 1. SD is the square root. Sample needs at least two numbers.
The formula runs in this tab. CZNull does not receive the numbers.
How this page computes
A single z from a known mean and SD is the z-score page. This page does not assume a normal curve beyond the formula.
Entities and related jobs
Population and sample standard deviation and variance for a list you type. Named features: Population SD, Sample SD.
See also Variance Calculator, Average Calculator, Z-Score Calculator, Median and Mode.
Use cases
Lab repeats, exam spread, and process control. It does not plot a histogram.
Limits
Invalid input appears in the status line. IEEE floating point applies unless a row says otherwise. CZNull does not receive the numbers.