MTBF, MTTR & Availability Calculator
Turn operating time, failures, and downtime into mean time between failures, mean time to repair, and asset availability. Your numbers stay in your browser.
Availability
0%
How this is calculated
Everything here is derived from the three numbers you enter for a single asset over one measurement period. Uptime is the operating time that was not lost to failures.
Because MTBF and MTTR share the same failure count, this is mathematically identical to uptime ÷ operating time × 100, which is why the two agree.
Inherent vs operational availability
- What this measures. This is operational availability for the period you enter, since your downtime figure can include waiting for parts, labor, and administrative delays, not just active repair.
- Inherent availability uses only active repair time and assumes parts and crews are always ready. It is usually higher than operational availability and is a design metric, not a floor-level one.
- Divide by zero. With zero failures, MTBF and MTTR are undefined, so the calculator reports availability directly from uptime and operating time and marks the repair metrics as not applicable.
- One asset, one period. Averaging across many machines or long windows can hide a single bad actor. Segment by asset and shift where you can.
Availability is one of the three OEE factors. To see how it combines with performance and quality, use the OEE calculator and read the OEE calculation guide. To put a dollar figure on the downtime behind these numbers, try the downtime cost calculator.
See failures before they become downtime
Harmony connects your machines, systems, and paperwork into one real-time operational layer, no rip-and-replace, so the failures and repair delays behind these numbers become visible and actionable. Read the CLS case study.
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