Standard Deviation Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Data
Runs in your browser. Your data is not uploaded or stored.
Result
Paste some numbers to see the statistics.
How to use this calculator
- Paste your numbers (commas, spaces or new lines).
- Read both the sample and population standard deviation, plus variance and a summary.
How it works
Standard deviation measures spread around the mean. Sample divides by n−1 (Bessel's correction); population divides by n.
Worked example
2,4,4,4,5,5,7,9. Population σ = 2; sample s ≈ 2.14.
Tips
- Runs entirely in your browser. Your inputs are not saved or transmitted.
Frequently asked questions
Sample or population?
Use sample when your data is a sample of a larger group; population when it's the entire set.
Privacy?
Runs entirely in your browser. Your inputs are not saved or transmitted.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.