MTTR, MTBF and Availability Calculator
How often does this asset fail, and how long does it take to fix?
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MTBF, MTTR and availability formulas
MTBF = operating hours ÷ number of failures
MTTR = total repair time ÷ number of failures
Availability = MTBF ÷ (MTBF + MTTR)
Worked example
A pump ran 2,000 hours in a quarter, broke down 4 times, and repairs took 24 hours in total.
| Metric | Calculation | Result |
|---|---|---|
| MTBF | 2,000 ÷ 4 | 500 hours |
| MTTR | 24 ÷ 4 | 6 hours |
| Availability | 500 ÷ (500 + 6) | 98.8% |
Cutting repair time by 25% (MTTR 4.5 hours) would raise availability to 99.1%.
How to improve each one
- Raise MTBF (fewer failures): preventive maintenance on schedule, condition monitoring on critical rotating equipment, and fixing repeat failures at the root.
- Cut MTTR (faster repairs): instant breakdown alerts, the asset's repair history and SOPs on the technician's phone, and the right spares in stock.
Where to get accurate numbers
MTBF and MTTR are only as good as your maintenance records. Every breakdown needs a start time, an end time and a cause. A CMMS such as PlantOps360 records these from each work order and shows MTTR, MTBF and failure trends on a dashboard, with no spreadsheet needed.