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Mean Time Between Failure (MTBF) is the average of the run times of a machine, between two failures, for a particular time period. Time period can be one week, one month, one year etc…
How to Calculate Mean Time Between Failure (MTBF)
MTBF is calculated by following formula,
Run time is the total running time of the machine for a particular time period.
Running time can be calculated by reducing total breakdown time from the available time, for a particular time period. Don’t forget to reduce other breaks such as tea break, lunch break, idle time, etc. We only need the time the machine is producing something.
No of Failures is the total no of breakdowns of the machine for a particular time period.
Calculation Example
Following is the data for a machine and we are going to calculate MTBF for a month.
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What if i have 10 machines? will the available time get multiplied by 10?
Hi Meet…. I don’t recommend to calculate one mtbf for all machines together, since it only give a general idea of all machines….and by analysing that we cannot focus on improvement, where it is really needed.
It will give overall idea.
One thing we can do is first calculate individual mtbf and then calculate overall mtbf.
When calculating overall mtbf all times must be multiplied by no of machines or we should add up times of all machines.
ok, thanks melvin for clarifying this