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MTBF Calculator

Mean time between failures is the average run time between breakdowns for a repairable asset.

Mean Time Between Failures is operating time divided by failures: how long an asset runs, on average, before it breaks. Enter your operating hours and failure count to get MTBF, your failure rate, and what a higher MTBF would mean in failures avoided. The answer is only as good as your definition of failure.

Reliability Engineers Maintenance Managers Planners

What is MTBF?

The average operating time between failures, a core reliability measure for repairable equipment.

How do you calculate MTBF?

Total operating time divided by the number of failures in that time.

What is the difference between MTBF and MTTF?

MTBF is for repairable assets. MTTF is for items that are replaced rather than repaired.

Does a higher MTBF mean better reliability?

Yes. A longer average time between failures means the asset runs longer before breaking down.