Maintenance & Reliability calculator
MTTR Calculator
Measure the average active elapsed time needed to complete a corrective repair. Enter the summed repair clock time and matching completed repair count.
What this calculator does
- Measure average active elapsed repair time for completed corrective repairs.
Formula used
- MTTR = active repair hours ÷ completed corrective repairs
- Minutes per repair = MTTR × 60
Inputs explained
- Active Repair Hours: Summed elapsed active repair time for completed corrective repairs.
- Completed Repairs: Whole corrective repairs included in the recorded active hours.
How to use the result
- Best suited to corrective repair Review, maintainability improvement trial.
- Waiting for parts and administrative delays belong in total downtime. The mean does not reveal the slowest repair or its probability.
Current U.S. benchmarks
- U.S. manufacturing runs at 75.7% of capacity (Federal Reserve, Aug 2026). New factory orders are up 8.5% year over year (Census).
Common questions
- Should two technicians double the repair hours? No, use elapsed repair duration once. Technician labor hours measure staffing effort and answer a different cost question.
- Can open work orders enter this average? No, include completed repairs with a recorded finish. Report the open backlog separately so unfinished long repairs are visible.
- Does this include preventive servicing? No, the repair cohort contains corrective work. Planned servicing belongs in a separate maintenance duration metric.
- Why is the result blank with zero repairs? There is no completed repair cohort to average. Entering zero repairs cannot establish zero repair time.
Related guides
Last reviewed 2026-10-06.