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Mann-Whitney U Rank Sum Test Calculator

U = n1n2 + n1(n1+1)/2 − R1 — non-parametric two-sample test.

Calculates the Mann-Whitney U statistic from group sizes and the rank sum of group 1 to test for differences between two independent groups.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

U1 = n1×n2 + n1(n1+1)/2 − R1; U = min(U1,U2)

In depth

Calculates the Mann-Whitney U statistic from group sizes and the rank sum of group 1 to test for differences between two independent groups.