Chi-Square Calculator
Calculate chi-square statistic to test if observed data matches expected distribution.
- Free Online Tool
- Instant Results
- Mobile Friendly
- No Installation
- Secure & Private
Understanding This Calculator
Chi-Square Formula
Measures difference between observed and expected frequencies.
χ² = Σ [ (O - E)² / E ]
- O: Observed Value
- E: Expected Value
Example 1
Observed: 20, Expected: 10
- (20 - 10)² / 10 = 100 / 10 = 10
Example 2
Observed: [10, 10], Expected: [10, 10]
- (0)²/10 + (0)²/10 = 0 (Perfect fit)
How to Use
- Enter observed frequencies.
- Enter expected frequencies.
Frequently Asked Questions
How do I use the Chi-Square Test Calculator?
Enter your values in the input fields, and the result will appear instantly.
Is this calculator free to use?
Yes, this calculator is 100% free and does not require any registration or subscription.
Is it mobile-friendly?
Absolutely! Our tool is optimized for all devices, including mobile phones, tablets, and desktop computers.