Relative Risk Formula

The following equation is used to calculate the relative risk between a group exposed to a particular disease and a control group.


Relative Risk Definition

Relative risk is a ratio that represents the relative amount of risk of a group of people contracting a given disease based on the number of people with and without the disease in both groups.


How to calculate relative risk?

The following is a step by step example problem of using the formula above to calculate a relative risk.

  1. Step 1 is to determine the number of people with the disease in the exposed group.
  2. Next, determine the number of people without the disease in the exposed group.
  3. Next, determine the number of people with and without the disease in the control group.
  4. Finally, calculate the relative risk ratio using the formula and information from steps 1-3.

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