Are MTBF and lifetime the same?
No. Under the exponential model MTBF is the mean of the distribution, not a time by which all or most units will survive.
Reliability Toolkit
Exponential Reliability, MTBF and FIT Calculator
Evaluate a constant-hazard exponential reliability model and convert between MTBF, hourly hazard rate and failures-in-time (FIT).
How to use it
Inputs that remain auditable.
- 01
Enter the mission time in hours.
- 02
Enter MTBF/MTTF in hours.
- 03
Read reliability, failure probability, hazard rate and FIT together.
Questions
Frequently asked
What is one FIT?
One FIT is one expected failure per 10⁹ device-hours under the assumed constant hazard rate.