Math & Calculators / Standard Deviation Calculator
Standard Deviation Calculator
Calculate mean, variance, and standard deviation for a data set.
Features
- Population and sample modes
- Shows mean and variance too
- Instant results
- Free, unlimited use
How to Use
Step 1
Enter your numbers, separated by commas or spaces.
Step 2
Choose population or sample.
Step 3
Click Calculate.
About This Tool
Standard Deviation Calculator computes the mean, variance, and standard deviation of a set of numbers, supporting both population and sample calculations.
Formula used: Variance = Σ(x - mean)² ÷ N (population) or ÷ (N-1) (sample). Standard Deviation = √Variance.
Frequently Asked Questions
Which mode should I use?
Use sample if your data is a subset of a larger population; use population if it represents the entire group.
How many numbers do I need?
At least 2 numbers are required for a meaningful calculation.