Enter the Mean Time Between Failures (MTBF) into the calculator to determine the Failure In Time (FIT), which represents the number of failures that can be expected per billion hours of operation.
MTBF to FIT Formula
The following formula is used to convert MTBF to FIT.
FIT = \frac{1,000,000,000}{MTBF}Variables:
- FIT is the number of failures that can be expected per billion hours of operation.
- MTBF is the Mean Time Between Failures in hours.
To convert MTBF to FIT, divide 1 billion by the MTBF value.
| MTBF (h) | FIT (failures per 10^9 h) |
|---|---|
| 1 | 1000000000 |
| 10 | 100000000 |
| 24 | 41666666.667 |
| 72 | 13888888.889 |
| 168 | 5952380.952 |
| 720 | 1388888.889 |
| 1000 | 1000000 |
| 2000 | 500000 |
| 5000 | 200000 |
| 8760 | 114155.251 |
| 10000 | 100000 |
| 20000 | 50000 |
| 50000 | 20000 |
| 100000 | 10000 |
| 200000 | 5000 |
| 500000 | 2000 |
| 1000000 | 1000 |
| 5000000 | 200 |
| 10000000 | 100 |
| 100000000 | 10 |
| * Rounded to 3 decimals where applicable. Formula: FIT = 1×10^9 / MTBF(h). 1 FIT = 1 failure per 10^9 device-hours. | |
What is MTBF?
MTBF, or Mean Time Between Failures, is a reliability metric that represents the average time between system breakdowns or failures. It is commonly used in various industries to predict the reliability and performance of products over time. A higher MTBF indicates better reliability.
What is FIT?
FIT, or Failure In Time, is a unit of measure that represents the expected number of failures per billion hours of operation. It is used to express the reliability of components, especially in the electronics industry, where high volumes and long operational hours are common.
How to Calculate FIT from MTBF?
The following steps outline how to calculate FIT from MTBF.
- First, determine the MTBF in hours.
- Next, use the formula FIT = 1,000,000,000 / MTBF.
- Finally, calculate the FIT value.
- After inserting the MTBF and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
MTBF = 50,000 hours
Using the formula, FIT = 1,000,000,000 / 50,000, we find that FIT = 20,000 failures per billion hours of operation.