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Relative Risk Calculator

Statistics
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Calculates the relative risk (RR) to determine the likelihood of an event occurring in an exposed group versus a non-exposed group.

More tools:Math & Statistics Calculators
How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Exposed Group: Number with Event, Exposed Group: Total Number, Unexposed Group: Number with Event, and Unexposed Group: Total Number in the units shown.

Step 2

Read Unexposed Group Risk, Exposed Group Risk, and Relative Risk (RR) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Example 1

Exposed Group: Number with Event: 20; Exposed Group: Total Number: 200; Unexposed Group: Number with Event: 10; Unexposed Group: Total Number: 200

Unexposed Group Risk: 0.05; Exposed Group Risk: 0.1; Relative Risk (RR): 2

Example 2

Exposed Group: Number with Event: 5; Exposed Group: Total Number: 50; Unexposed Group: Number with Event: 1; Unexposed Group: Total Number: 50

Unexposed Group Risk: 0.02; Exposed Group Risk: 0.1; Relative Risk (RR): 5

Example 3

Exposed Group: Number with Event: 15; Exposed Group: Total Number: 150; Unexposed Group: Number with Event: 3; Unexposed Group: Total Number: 150

Unexposed Group Risk: 0.02; Exposed Group Risk: 0.1; Relative Risk (RR): 5

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