Measure how spread out your data is from the average. Crucial for statistics, quality control, finance, research — anywhere you need to understand variability.
Informational calculator only. Verify important outputs independently before legal, tax, medical, engineering, safety-critical, contractual, employment, or compliance use.
Enter job values, review the estimate, then use the decision hints before ordering or quoting.
Enter numbers separated by commas
σ = √[ Σ(xi - μ)² / N ]μ — mean, xi — each value, N — number of values. This is population standard deviation (divide by N). For sample, divide by N-1.
Variance = σ²
Use population (divide by N) for entire dataset; sample (divide by N-1) for estimates from a sample.
Data points are clustered close to the mean — low variability.