basic

Relative Risk (Risk Ratio) Calculator

RR = risk_exposed / risk_unexposed.

Compute relative risk (risk ratio) from a 2×2 contingency table. RR is the ratio of the probability of an outcome in the exposed group to the probability in the unexposed group.

Daniel Oh By Daniel Oh
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

RR = (a / (a + b)) / (c / (c + d))

In depth

Compute relative risk (risk ratio) from a 2×2 contingency table. RR is the ratio of the probability of an outcome in the exposed group to the probability in the unexposed group.