Mann-Whitney U Test Calculator (Wilcoxon Rank-Sum)
Performs a non-parametric test to compare differences between two independent groups when the assumption of normality is violated. It calculates the U statistic and associated p-value.
Mann-Whitney U Test Calculator (Wilcoxon Rank-Sum) gives you a faster way to work through practical calculation scenarios without rebuilding the same calculation from scratch every time. Start with Sample Size of Group 1 (n1), Sample Size of Group 2 (n2), and Sum of Ranks for Group 1 and use the live outputs to estimate U Statistic for Group 1, U Statistic for Group 2, and U Statistic (smaller of U1 and U2) in one pass. This page is built to help you compare scenarios quickly, validate rough assumptions, and move into a related calculator when you need a second angle on the same problem.
Use The Calculator In A Few Steps
Work through the inputs deliberately, then compare outputs instead of relying on a single scenario.
Scenario Checks
Use these examples to verify the behavior of the calculator before you run your own values.
What Users Usually Need Next
Keep the calculator open while you skim these answers so you can test the scenario that matters.
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Calculates the standard error, which measures the accuracy with which a sample represents a population. It's commonly used for the standard error of the mean (SEM) and the standard error of the proportion.
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Calculates the Chi-Square statistic and p-value for goodness-of-fit or test of independence. It requires observed and expected frequencies or values.