Enter the number of false positives and the number of tests into the False Positive Rate Calculator. The calculator will evaluate the False Positive Rate.

- All Rate Calculators
- False Discovery Rate Calculator
- Negative Predictive Value Calculator
- Specificity Calculator

## False Positive Rate Formula

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

FPR = FP / T * 100

- Where FPR is the False Positive Rate (%)
- FR is the number of false positives
- #T is the number of tests

To calculate the false positive rate, divide the number of false positives by the number of tests, then multiply by 100.

## How to Calculate False Positive Rate?

The following example problems outline how to calculate False Positive Rate.

Example Problem #1:

- First, determine the number of false positives.
- The number of false positives is given as: 50.

- Next, determine the number of tests.
- The number of tests is provided as: 150.

- Finally, calculate the False Positive Rate using the equation above:

FPR = FP / #T * 100

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

FPR = 50 / 150 * 100 = 33.33 (%)

Example Problem #2:** **

For this problem, the variables required are provided below:

number of false positives = 60

number of tests = 180

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

FPR = FP / #T * 100** = ?**