Chi Square Calculator
Chi-square statistic and p-value for a goodness-of-fit test with up to four categories.
Compare Your Options And Get Clear Answers
Chi-square statistic and p-value for a goodness-of-fit test with up to four categories.
Chi Square Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Enter Values
Fill in each field with your own numbers.
Calculate
Results update as you change the inputs.
Review
Read the breakdown and the explanation.
Adjust
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Chi Quick Guide
Typical values for reference.
| O1 | O2 | O3 | Chi-square |
|---|---|---|---|
| 40 | 40 | 15 | 0.000 |
| 48 | 35 | 15 | 4.025 |
| 60 | 25 | 10 | 17.292 |
| 30 | 50 | 15 | 5.000 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Chi Square Calculator FAQ
Answers to common questions about this calculator.
A test comparing observed counts with expected counts.
Categories minus one for goodness of fit.
Chi-square = sum of (observed – expected)^2 / expected.
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.