Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Chi-Square Goodness of Fit Calculator

Tests whether your observed frequency counts match a theoretically expected distribution. Use it to check if a die is fair, verify that survey responses follow a predicted pattern, or validate a statistical model.

Observed Frequency 1 (observations)

Expected Frequency 1 (observations)

Observed Frequency 2 (observations)

Expected Frequency 2 (observations)

Fill in the required fields to see your result.

Probability

Conditional Probability Calculator

Apply Bayes' theorem to find conditional probabilities, intersections, and unions of two events. Useful in medical testing, risk analysis, and machine learning evaluation.

P(A) - Probability of Event A

P(B) - Probability of Event B

P(B|A) - Probability of B given A

Calculate

Fill in the required fields to see your result.

Key differences

	Chi-Square Goodness of Fit Calculator	Conditional Probability Calculator
Category	Probability	Probability
Inputs required	4	4
Result	Chi-Square Statistic (χ²)	Probability
What it does	Tests whether your observed frequency counts match a theoretically expected distribution. Use it to check if a die is fair, verify that survey responses follow a predicted pattern, or validate a statistical model.	Apply Bayes' theorem to find conditional probabilities, intersections, and unions of two events. Useful in medical testing, risk analysis, and machine learning evaluation.