Sample Variance Calculator for stable classroom formulas that do not depend on outside rules when you want a fixed formula answer without improvising the math by hand.
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.
s^2 = sum((x - mean)^2) / (n - 1)Use n - 1 in the denominator when the values represent a sample instead of a full population.
This page uses four inputs for a straightforward sample-variance workflow.
Keep more precision when the output will feed another formula, drawing, coordinate step, or comparison rather than being rounded once and left alone.