Standard Deviation Calculator
Jenzzy computes variance and standard deviation with optional sample (n−1) correction.
Inputs
Results
Enter values to see results.
Formula
σ = √(Σ(x−μ)²/N); sample s uses N−1
Average squared deviation from mean, then square root for original units.
Example
- Mean: 5
- Variance: 4
- SD: 2= 2
Result: Population SD = 2
Frequently Asked Questions
Sample vs population?
Use sample SD when data is a subset of a larger population.
Units?
SD shares units with data—variance is squared.
Zero SD?
All identical values produce SD of 0.