Incidence Rate Calculator

Formula

To calculate the incidence rate:

\[ IR = \frac{NC}{AP} \times 100 \]

Where:

\(IR\) is the incidence rate (%)
\(NC\) is the number of new cases during the time period
\(AP\) is the average population during the time period

What is Incidence Rate?

An incidence rate is a measure of the total number of people that contract a disease over a period of time compared with people who could have been exposed to the disease. It is used to measure the risk of developing a disease over a specified period of time.

Example Calculation 1

Let's assume the following values:

Number of New Cases (\(NC\)) = 50
Average Population (\(AP\)) = 1000

Using the formula:

\[ IR = \frac{50}{1000} \times 100 = 5\% \]

The Incidence Rate is 5%.

Example Calculation 2

Let's assume the following values:

Number of New Cases (\(NC\)) = 200
Average Population (\(AP\)) = 5000

Using the formula:

\[ IR = \frac{200}{5000} \times 100 = 4\% \]

The Incidence Rate is 4%.