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Mean-time between failure (MTBF)

The average time between equipment failures over a given period i.e. the average time a device will function before failing. It is the reliability rating indicating the expected failure rate of equipment.

Details

Interpretation:

It is the reliability rating indicating the expected failure rate of equipment.


Unit: Time

Direction: Maximize

Unit: Days

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This KPI is most used for:
Operational Excellence

Comments

  1. Abhishek Agnihotry

    How we describe it ?
    how to calculate it or what should be the numbers, i.e. I have service “A” should i say MTBF should be xyz (but how come bring the realistic numbers ?

    Regards
    Abhishek

  2. arun kumar

    i need the formulas to calculate KPI for maintenance

  3. Jessie Valentini

    So I’m assuming this implies for you to set a standard per piece of equipment of the time (in days) it takes before it breaks down.

    From there you measure the time (in days) between each breakdown and compare it to the average you calculated initially.

    If the trend shows that the time between each breakdown is shorter than the average, then you will need to either revisit your average to determine if it was accurate, or that your equipment is potentially getting old and therefore is breaking down more quickly (or even potentially through misuse by employees)

    If the time is longer than the average (although this is positive) it would be worth looking at revising your average to a higher time in order to more accurately reflect its real length before breaking down.

    Formula would be:

    (Actual time (in days) between 1st and 2nd breakdown / Average time in days) * 100

    This will demonstrate the percentage of time it actually took to breakdown. E.g. if it is 100% then the equipment has broken down at a time you anticipated it would. Percentages either side of 100% reflect a shortfall or excess of time.

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