MTBF & MTTR Calculator
The two numbers maintenance lives by: how long an asset runs before it fails, and how long it takes to fix. Together they give you availability. Updates as you type.
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One asset over a defined window (e.g. last quarter).
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Cut MTTR by minutes, raise MTBF by months.
Most repair time is diagnosis - figuring out what broke and why. Fabrico shows the true cause of every stop on video the moment it happens, so repairs start faster (lower MTTR) and recurring failures get designed out (higher MTBF).
See how Fabrico improves reliabilityThe formulas
- MTBF = total operating time ÷ number of failures. Higher is better - the asset runs longer between failures.
- MTTR = total repair time ÷ number of failures. Lower is better - failures are fixed faster.
- Inherent availability = MTBF ÷ (MTBF + MTTR).
With 1,000 operating hours, 10 failures and 20 repair hours: MTBF = 100 h, MTTR = 2 h, availability = 100 ÷ 102 = 98.0%.
Should MTTR include waiting time?
It depends on your definition. "MTTR - repair" is wrench time only; "MTTR - restore" includes waiting for parts and technicians. Be consistent and label which you use - the waiting is often the biggest, most fixable chunk.
How does this relate to OEE?
Availability here is the reliability view of the same availability factor in OEE. Frequent short failures also overlap with micro-stops.
What's a good MTBF?
It's entirely asset- and context-specific - compare against your own trend and similar equipment, not a universal number. The goal is the direction: MTBF up, MTTR down.
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