Chi-Square Calculator

Calculate chi-square statistics for goodness-of-fit and independence tests with detailed results including p-value and interpretation.

Request Feature / Support

7,636+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

AI Web Tool Generator

Build Your Own Custom Web Calculator in Seconds

Type what tool or calculator you need below. Our AI will build it instantly for your site.

About This Tool

This online chi-square calculator performs statistical hypothesis testing for goodness-of-fit and independence tests. Enter observed and expected frequencies to calculate the chi-square statistic, degrees of freedom, p-value, and determine statistical significance. The tool provides detailed interpretation of results including whether to reject or fail to reject the null hypothesis. Perfect for students, researchers, and data analysts working with categorical data.

Save your calculation history with a free account

How to Use

Select test type (goodness-of-fit or independence)
Enter observed frequencies in the table
For goodness-of-fit, enter expected frequencies or percentages
Click 'Calculate Chi-Square' to run the test
View detailed results including test statistic, p-value, and interpretation
Use 'Reset' to clear all inputs and start over

Frequently Asked Questions

Find Quick Answers

What is a chi-square test used for?

Chi-square tests are used to determine if there is a significant association between categorical variables (independence test) or if observed frequencies match expected frequencies (goodness-of-fit test).

How do I interpret the p-value?

If p-value < 0.05 (common significance level), you reject the null hypothesis and conclude there is a significant association/difference. If p-value ≥ 0.05, you fail to reject the null hypothesis.

What are degrees of freedom in chi-square tests?

For goodness-of-fit: df = number of categories - 1. For independence test: df = (rows - 1) × (columns - 1). Degrees of freedom affect the critical value and p-value calculation.

Can this calculator handle 2x2 contingency tables?

Yes, the calculator supports 2x2 and larger contingency tables for independence tests. Simply enter observed frequencies for each cell.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

Related Tools

Other useful calculators and utilities you might like

Spotify to MP3 Converter

Convert Spotify tracks and playlists to MP3 format instantly with our free online converter.

Road Distance Calculator

Calculate the driving distance and travel time between two addresses with our free online road dista...

Age Calculator

Calculate your exact age in years, months, and days from any birth date to any target date.

Currency Converter

Convert currencies instantly with real-time exchange rates and historical data support.

Your Feedback Matters

Help Us to Improve