Enter the number of positive results and the number of tests into the Positivity Rate Calculator. The calculator will evaluate the Positivity Rate.

## Positivity Rate Formula

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

PO = P / T * 100

• Where PO is the Positivity Rate (%)
• P is the number of positive results
• T is the number of tests

## How to Calculate Positivity Rate?

The following example problems outline how to calculate Positivity Rate.

Example Problem #1:

1. First, determine the number of positive results.
• The number of positive results is given as: 30.
2. Next, determine the number of tests.
• The number of tests is provided as: 60.
3. Finally, calculate the Positivity Rate using the equation above:

PO = P / T * 100

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

PO = 30 / 60 * 100 = 50.00 (%)

Example Problem #2:

For this problem, the variables required are provided below:

number of positive results = 50

number of tests = 60

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

PO = P / T * 100 = ?