Enter the total amount of people with a disease and without of two separate groups; one being the exposed group and one being the control. The calculator will determine the relative risk.

## Relative Risk Formula

The following equation can be used to calculate the relative risk of two groups of people.

R = [ a / (a+b)] / [c/(c+d))]

- Where R is the relative risk
- a is the number of people in the exposed group with a disease
- b is the number of people in the exposed group without the disease
- c is the number of people in the control or base group with the disease
- d is the number of people ins the control group without the disease

## What is relative risk?

Relative risk is measure the the risk ratio of one group to another. In other words, it compares how many people get a particular disease when exposed with a outside factor with respect to a control group not exposed to that factor.

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