Risk Reduction Calculator
Click and drag 1 or more of the gray arrows to change the control event rate (CER), experimental event rate (EER), relative risk reduction (RRR), and absolute risk reduction (ARR) or type the values into 1 or more boxes. Hit Enter on your keyboard to calculate the risk reduction. Click on the arrow next to “Mode” to change from CER to RRR. Click “Reset” to start again.