Standard Deviation Calculator
Calculate standard deviation, variance, and mean.
- 100% free
- Private in browser
- No signup
- No watermarks
Result
- Standard deviation
- —
- Variance
- —
- Mean
- —
- Count
- 0
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About Standard Deviation Calculator
Standard deviation measures how spread out your data is around the mean. Standard Deviation Calculator on TheToolss computes both population and sample standard deviation, along with variance, mean, and count, from numbers separated by commas, spaces, or lines. Choose sample (n−1) or population (n) depending on your data. It is ideal for statistics homework, quality checks, and research. It runs in your browser — free, private, and no signup.
How to use Standard Deviation Calculator
- Paste or type your numbers.
- Choose population or sample.
- Read the standard deviation, variance, and mean.
Key features
- Population and sample formulas
- Standard deviation and variance
- Also shows mean and count
- Accepts commas, spaces, or lines
- Private in-browser calculation
Frequently asked questions
- Is the Standard Deviation Calculator free?
- Yes. It is free on TheToolss with no signup.
- What is the difference between sample and population?
- Population divides by n; sample divides by n−1 (Bessel’s correction). Use sample when your data is a subset of a larger group.
- What is variance?
- Variance is the average of squared differences from the mean. Standard deviation is its square root.
- What separators can I use?
- Commas, spaces, tabs, or new lines all work.
- Is my data uploaded?
- No. The calculation runs in your browser.
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