ANOVA Calculator
Free one-way ANOVA calculator. Paste group data to get the F statistic, p-value, eta-squared effect size, and Bonferroni-adjusted pairwise comparisons. In your browser.
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What is ANOVA Calculator?
The ANOVA Calculator performs a one-way analysis of variance on pasted group data: it reports the F statistic, an exact p-value, eta-squared effect size, and Bonferroni-adjusted pairwise comparisons, all computed instantly in your browser.
Key Benefits
- One clear test instead of many overlapping t-tests.
- Exact F-distribution p-values, not approximations.
- Effect size reported, so significance has context.
- Pairwise follow-ups show which groups actually differ.
- No data leaves your browser - safe for unreleased research.
Common Use Cases
- •Comparing outcomes across treatment, control, and placebo groups.
- •Checking whether A/B/C variants truly perform differently.
- •Coursework and statistics homework verification.
- •Quick sanity checks before running a full statistics package.
How to Use the ANOVA Calculator
- Paste your groups: Put each group on its own line and separate values with commas or spaces.
- Choose alpha: Pick the significance level for the test - 0.05 is the common default.
- Read the F and p: The F statistic, degrees of freedom, and exact p-value update as you type.
- Follow up pairwise: Use the Bonferroni-adjusted pairwise table to see which groups differ.
Key Features
- Complete ANOVA table: sums of squares, df, mean squares, and F.
- Exact F-distribution p-values via the incomplete beta function.
- Eta-squared effect size next to the significance verdict.
- Adjustable significance level: 0.05, 0.01, or 0.001.
- Pairwise Welch t-tests with Bonferroni adjustment.
- Instant recalculation - everything runs in your browser.