Enter the control event rate and the experimental event rate into the calculator to determine the absolute risk reduction.

## Absolute Risk Reduction Formula

The following equation is used to calculate an absolute risk reduction.

ARR = CER – EER

- Where ARR is the absolute risk reduction (%)
- CER is the control even rate (%)
- EER is the experimental event rate (%)

## FAQ

**What is an absolute risk reduction?**

An absolute risk reduction, or ARR for short, is a measure of the absolute difference between a control group and a group receiving a treatment to prevent the event from happening.

**What is an absolute risk?**

An absolute risk is a ratio of the number of people that have a particular event, typically a medical event, compared to the total number of people that it could happen to.

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