What is mean time to repair (MTTR)?
MTTR is the average time taken to restore a failed asset to working order, from the failure to the return to service. A lower MTTR means failures cost less downtime. It is calculated by dividing total repair time by the number of repairs.
Benchmark
| Benchmark | |
|---|---|
| Good | Lower is better. Strong MTTR reflects good spares, planning, and access for the assets that matter. |
| Warning sign | A high or rising MTTR on critical assets multiplies the cost of every failure. |
Why it matters
MTTR decides how much each failure actually costs in lost production. Two plants with the same failure rate can have very different downtime bills if one restores assets in two hours and the other takes a day. It is heavily influenced by spares availability, planning, and access, all of which are controllable.
How to improve it
Lower MTTR with critical spares strategy, pre-planned repair procedures, fast and safe access, and trained crews ready for the failures that matter most.
Frequently asked questions
How do you reduce MTTR?
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