Last Updated: April 12, 2026
Standard Deviation Calculator
Enter comma-separated numbers to calculate mean, variance, and standard deviation.
Results
Count (N)—
Sum—
Mean (x̄)—
Median—
Range—
Population Variance (σ²)—
Population Std Dev (σ)—
Sample Variance (s²)—
Sample Std Dev (s)—
Calculation Example
Here's a practical example using the Standard Deviation Calculator: Enter your values in the fields above to get instant results. Try adjusting the parameters to compare different scenarios. This tool helps you make informed decisions by providing accurate standard deviation calculations based on standard formulas and up-to-date data.
Frequently Asked Questions
What is standard deviation?
It measures how spread out data points are from the mean. Low = clustered; high = spread out.
Population vs. sample standard deviation?
Population divides by N; sample divides by N−1 to correct for bias in subsets.
How do you calculate variance?
Average of squared differences from the mean. Variance = σ² or s².