Enter the number of failures and the total time (hrs) into the FIT Rate Calculator. The calculator will evaluate the FIT Rate.

## FIT Rate Formula

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

FIT = F/T * 10^9

• Where FIT is the FIT Rate (failures per one billion device hours)
• F is the number of failures
• T is the total time (hrs)

## How to Calculate FIT Rate?

The following example problems outline how to calculate FIT Rate.

Example Problem #1:

1. First, determine the number of failures.
• The number of failures is given as: 3.
2. Next, determine the total time (hrs).
• The total time (hrs) is provided as: 100,000.
3. Finally, calculate the FIT Rate using the equation above:

FIT = F/T * 10^9

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

FIT = 3/100,000 * 10^9 = 30,000 (failures per one billion device hours)

Example Problem #2:

For this problem, the variables required are provided below:

number of failures = 6

total time (hrs) = 200,000