MTTR & MTBF Calculator
Calculate Mean Time To Repair, Mean Time Between Failures and equipment availability.
Equipment Data
Enter operating, downtime and failure data
hours
Total actual running time of the equipment.
hours
Total downtime spent repairing failures.
failures
Total equipment failure events.
hours
Operating Time + Repair Time.
Reliability Result
MTBF, MTTR and equipment availability
Maintenance Performance
MTBF
100.00
hours between failures
MTTR
5.00
hours to repair
Failure Frequency
0.0100
Failures per operating hour
Total Downtime
50.00
Repair time
Operating Time
1,000.00
Actual running time
Failures
10
Failure events
Equipment Availability
95.24%
MTBF
=
Total Operating Time ÷ Number of Failures
MTTR = Total Repair Time ÷ Number of Failures
MTTR = Total Repair Time ÷ Number of Failures
MTBF = 1000 ÷ 10 = 100 h
|
MTTR = 50 ÷ 10 = 5 h
MTBF & MTTR Formula
Basic maintenance reliability formulas
MTBF
=
Operating Time / Failures
MTTR = Repair Time / Failures
Availability = MTBF / (MTBF + MTTR) × 100
MTTR = Repair Time / Failures
Availability = MTBF / (MTBF + MTTR) × 100
MTBF indicates the average operating time between
failures, while MTTR indicates the average time
required to restore equipment after a failure.
How to Calculate
Follow these simple steps.
1
Enter Operating Time
Enter the total time equipment was running.
2
Enter Repair Time
Enter total downtime spent on repairs.
3
Enter Failures
Enter the total number of failure events.
4
Calculate
Review MTBF, MTTR and equipment availability.
Practical Example
Manufacturing equipment example
| Parameter | Value |
|---|---|
| Operating Time | 1,000 h |
| Repair Time | 50 h |
| Failures | 10 |
| MTBF | 100 h |
| MTTR | 5 h |
Availability ≈
95.24%