Enter the number of false discoveries and the number of tests performed into the False Discovery Rate Calculator. The calculator will evaluate the False Discovery Rate. 

False Discovery Rate Formula

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

FDR = #FD / #T *100

  • Where FDR is the False Discovery Rate (%)
  • #FD is the number of false discoveries 
  • #T is the number of tests performed 

How to Calculate False Discovery Rate?

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

Example Problem #1:

  1. First, determine the number of false discoveries. 
    • The number of false discoveries is given as: 40.
  2. Next, determine the number of tests performed. 
    • The number of tests performed is provided as: 500.
  3. Finally, calculate the False Discovery Rate using the equation above: 

FDR = #FD / #T *100

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

FDR = 40 / 500 *100 = 8.00 (%)


Example Problem #2: 

For this problem, the variables required are provided below:

number of false discoveries = 20

number of tests performed = 600

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

FDR = #FD / #T *100 = ?