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Free Chi-Square
Calculator

Advanced browser-based chi-square calculator for contingency tables and goodness-of-fit tests with p-values, effect sizes, expected counts, residual analysis, practical warnings, and copy-ready reports.

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About Free Chi-Square Calculator

Analyze contingency tables and goodness-of-fit problems in one place. Paste counts, inspect expected frequencies and residuals, see practical assumption warnings, and get a copy-ready report with effect sizes and reproducible R code.

Workspace options

  • Confidence level (%)
  • 2×2 chi-square method
  • Residual heatmap emphasis

Available actions

  • ☼ / ◐
  • Independence / homogeneity
  • Goodness of fit
  • Load sample
  • Calculate chi-square
  • Reset