ToolCubbyStandard Deviation Calculator
Find the standard deviation, variance and mean of any data set — for a population or a sample, instantly and privately.
How to use
- Enter your numbers separated by commas, spaces or line breaks.
- Choose whether your data is a population or a sample.
- Click Calculate to see the standard deviation, variance and mean.
Formula
Mean μ = Σx / N\nVariance = Σ(x − μ)² / N (population)\nVariance = Σ(x − μ)² / (N − 1) (sample)\nStandard deviation = √variance
FAQ
What is standard deviation?
It measures how spread out the numbers are from the mean. A low value means the data is close to the mean; a high value means it is more spread out.
Sample or population?
Population uses every value and divides by N. Sample divides by N−1 to give an unbiased estimate.
Is it private?
Yes — everything runs in your browser.
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More FAQs
Are these calculators free to use?
Yes, every calculator is completely free, with no signup and no limits.
Do I need an account or install anything?
No. Everything runs in your browser — no install, no account.
Related searches
standard deviation calculator, variance calculator, sample standard deviation, population standard deviation, statistics calculator, data spread calculator, mean variance