How does the F-Test Calculator work?

F = larger variance / smaller variance Then: df₁ = n₁−1 · df₂ = n₂−1 Then: Compare to critical value from F-distribution Then: F=1 means equal variances.

Can you give an example of how to use the F-Test Calculator?

Example: Input s₁=2.5 (n=10) · s₂=1.8 (n=12) gives a result of F = 1.93 · df(9,11) · not significant (Variances not significantly different).

Is the F-Test Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the F-Test Calculator?

Our F-Test Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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F-Test Calculator

📊F-test (Variance Ratio)

Group 1 values (comma separated)

Group 2 values (comma separated)

The F-test for equality of variances tests whether two populations have the same variance. F = s₁²/s₂² (larger variance in numerator). Used as a preliminary test before pooled t-tests.

References

›F-test — Wikipedia

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F-Test Calculator

📊F-test (Variance Ratio)

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📊F-test (Variance Ratio)