Variance Calculator

Variance measures how spread out data values are from their mean. Standard deviation is the square root of variance and is in the same units as the original data

The calculator uses the standard published formula for variance. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: Population variance: σ² = Σ(xᵢ − μ)² / N. Each step in the calculation is shown so you can verify the result manually.