Availability
A = MTBF / (MTBF + MTTR) - the fraction of calendar time the equipment is capable of operating.
Loading calculator…
Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Mean Time Between Failures | h | |
| Mean Time To Repair | h | |
| Availability |
Source: IEC 60300 - Dependability management
In short
A = MTBF / (MTBF + MTTR) - the fraction of calendar time the equipment is capable of operating.