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F-Test Variance Ratio Calculator

F = s₁² / s₂² for comparing two sample variances.

Compute the F-statistic for comparing two sample variances (the larger over the smaller) and report the numerator and denominator degrees of freedom.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

F = max(s₁², s₂²) / min(s₁², s₂²); df₁ = n₁ − 1, df₂ = n₂ − 1.

In depth

Compute the F-statistic for comparing two sample variances (the larger over the smaller) and report the numerator and denominator degrees of freedom.