Mann-Whitney U Test Calculator

Calculate the Mann-Whitney U statistic and z-score for comparing two independent groups using rank sums.

Group 1 Size (n₁)

Group 2 Size (n₂)

Rank Sum for Group 1 (R₁)

Tab to move between fields

U Statistic

165

Z-Score

2.16

P-Value (two-tailed, approx)

0.03

U' Statistic60

U (min)60

Significant at α=0.05 (1=Yes)1

Effect Size (r)0.39

U Max165

How to Use This Calculator

Enter Group 1 Size (n₁), Group 2 Size (n₂), and Rank Sum for Group 1 (R₁).
Review U Statistic, Z-Score, and P-Value (two-tailed, approx).
Use U and U (min) to inform your decision.
Use the chart to visualize the results and explore different scenarios by adjusting inputs.

Ad Placeholder

Related Calculators

Perform a Kruskal-Wallis H test to compare rank distributions across multiple independent groups.

Calculate the t-statistic, degrees of freedom, and approximate p-value for a one-sample t-test.

Calculate Cohen's d, Hedges' g, and Glass's delta to measure the practical significance of differences between two groups.

Perform a chi-square goodness-of-fit test comparing observed and expected frequencies across four categories.

Calculate the required sample size for a study given the effect size, significance level, and desired statistical power.

Ad Placeholder