MTBF and MTTR Calculator by Equipment
Enter your equipment failure and repair history and get MTBF, MTTR and resulting availability instantly.
How are MTBF and MTTR calculated?
Formulas: MTBF = Operating time / Number of failures, MTTR = Repair time / Number of failures, Availability = MTBF / (MTBF + MTTR) x 100.
A high MTBF indicates high reliability (few failures). A low MTTR indicates an efficient corrective maintenance process. Availability combines both indicators to show the actual percentage of time the equipment is operational.
Frequently asked questions — MTBF/MTTR Calculator
What do MTBF and MTTR mean?
MTBF (Mean Time Between Failures) is the average time between equipment failures, indicating its reliability. MTTR (Mean Time To Repair) is the average time needed to repair the equipment after a failure, indicating the effectiveness of the corrective maintenance process.
What is a good availability value based on MTBF/MTTR?
Typical availability in manufacturing sits between 90% and 95%. Values below 90% suggest an insufficient preventive maintenance plan or excessive repair times. Critical sectors (energy, pharmaceutical) usually require availability above 98%.
How can I improve my MTBF?
Increasing MTBF requires reducing failure frequency: implement preventive or predictive maintenance, review out-of-spec operating conditions, improve operator training, and analyze root causes of recurring failures using methodologies like FMEA.
How can I reduce my MTTR?
Reducing MTTR involves improving the repair process efficiency: keeping critical spare parts in stock, accessible and up-to-date technical documentation, fast diagnostic procedures, and specific training of the maintenance team on the plant most critical equipment.
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