Enter the number of infections and the number of those at risk of infection into the Infection Rate Calculator. The calculator will evaluate the Infection Rate.

## Infection Rate Formula

The following two example problems outline the steps and information needed to calculate the Infection Rate.

IR = #I / #R * 100

• Where IR is the Infection Rate (%)
• #I is the number of infections
• #R is the number of those at risk of infection

## How to Calculate Infection Rate?

The following example problems outline how to calculate Infection Rate.

Example Problem #1:

1. First, determine the number of infections.
• The number of infections is given as: 1,500.
2. Next, determine the number of those at risk of infection.
• The number of those at risk of infection is provided as: 100,000.
3. Finally, calculate the Infection Rate using the equation above:

IR = #I / #R * 100

The values provided above are inserted into the equation below and computed.

IR = 1500 / 100,000 * 100 = 1.50 (%)

Example Problem #2:

For this problem, the variables required are provided below:

number of infections = 2,000

number of those at risk of infection = 300,000

Test your knowledge using the equation and check your answer with the calculator..

IR = #I / #R * 100 = ?