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Standard Deviation
Calculate variance and standard deviation. This tool runs 100% locally in your browser.
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What is Standard Deviation?
Calculate the Standard Deviation (σ) and Variance (σ²) of a dataset.
Understand how spread out your data is from the mean. Useful for researchers, students, and data analysts.
When to Use This Tool
- 1Analyzing survey data variability
- 2Quality control in manufacturing
- 3Financial risk assessment (volatility)
Formula Used
σ = √[ Σ(x - μ)² / N ]
Examples
Input
Data: 2, 4, 4, 4, 5, 5, 7, 9
Result
SD: 2.0, Mean: 5.0
Frequently Asked Questions
Population vs Sample?
This tool usually calculates both Population SD (dividing by N) and Sample SD (dividing by N-1).
Privacy & Security
Privacy is our priority. Unlike many other online tools, ToolsHub doesn't upload your data to any server. Whether you're processing sensitive text, calculating financial data, or generating passwords, everything stays in your browser.