Inputs
Math calculator
Standard Deviation Calculator
Use this when a list of values needs a cleaner spread summary than visual guessing can provide.
Results
Spread summary
Count6
Mean20.00
Population standard deviation6.03
Sample standard deviation6.60
Guide
How the standard deviation calculator works
The tool parses a list of numbers, calculates the mean, and then measures how far the values spread around that center.
- Check the input format before relying on the result.
- Use matching units and consistent values to avoid avoidable errors.
- These tools are useful when accuracy matters more than mental math speed.
FAQ
Common Standard Deviation questions
What does this standard deviation calculator show?
Helpful for classwork, basic analytics, reporting, and quick statistical checks.
Should I treat this as an official result?
It is intended for quick, accurate calculation and checking, especially when repeating the same math pattern.