How it works
Sum squared deviations from mean ÷ N (population) or N−1 (sample); take square root
Input definitions
- Numbers separated by commas or spaces
- Plain text; maximum 200,000 characters.
- Model
- Choose Population / Sample.
A worked example
- Numbers separated by commas or spaces
- 1, 2, 3, 4, 5
- Model
- Population
Assumptions & limits
Uses the stated input units. Results are rounded for display; keep additional precision for subsequent calculations.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-17. Content checked against the stated method and examples. Our verification approach.
Common questions
Why can statistical results differ between tools?
Denominator, interpolation and boundary conventions can differ. Use the method and assumptions on this page to compare the same definition; displayed decimals may also be rounded.
How does the Standard deviation tool work?
Sum squared deviations from mean ÷ N (population) or N−1 (sample); take square root.
What are the assumptions and limits of Standard deviation?
Uses the stated input units. Results are rounded for display; keep additional precision for subsequent calculations.