Standard Deviation Calculator
Calculate the standard deviation of a list of numbers. Choose between population or sample standard deviation. Supports decimals, negative numbers, and various input formats.
Why use this tool?
Standard deviation is a fundamental statistical measure that quantifies the amount of variation or dispersion in a set of values. This tool provides instant calculation with detailed statistics.
- Flexible input — accepts commas, spaces, or line breaks as separators.
- Both types supported — choose between population and sample standard deviation.
- Detailed stats — shows variance, mean, count, sum, min, and max.
- Privacy-focused — all calculations happen in your browser. No data is sent to servers.
- Fast and free — no sign-up required, instant results.
How to use
- Paste or type your list of numbers in the text area.
- Numbers can be separated by commas, spaces, or line breaks.
- Select either Population or Sample standard deviation.
- Click Calculate to see the results.
- View the standard deviation, variance, mean, and other statistics.
- Click Copy Results to copy all statistics to your clipboard.
Frequently Asked Questions
Yes, the MushTools Standard Deviation Calculator is completely free with no sign-up required. All calculations happen in your browser.
Population standard deviation uses N (total count) as the divisor, while sample standard deviation uses N-1 (Bessel's correction). Use population when you have data for the entire population, and sample when working with a subset.
This tool supports numbers separated by commas, spaces, or line breaks. You can paste entire lists from spreadsheets or documents. Decimals and negative numbers are fully supported.
No. Everything runs client-side in your browser. Your numbers are not stored or sent to any server.