MTBF and MTTR: calculate availability without hiding downtime
A maintenance example explains operating-time denominators, repair boundaries, unfinished events and why MTBF is not an equipment lifetime.
Mean time between failures (MTBF)
Average operating time between failures of a repairable asset.
MTBF: average operating time between inherent failures of a repairable asset under stated conditions. It is a statistical reliability measure, not a guaranteed service interval and not the same as uptime percentage.
See also: Mean time to repair (MTTR) · Asset performance management (APM) · CMMS
Use the concept: Cp, Cpk, Pp & Ppk calculator · Automation ROI & payback calculator · Downtime cost calculator
In depth
CMMS implementation: getting maintenance data worth trusting
Implement a CMMS that technicians actually use — asset hierarchy, PM optimization, work-order discipline, spares, and KPIs that drive decisions.
Automation ROI and payback: a business case operations can verify
Separate installed cost, cash savings, released capacity and recurring expenses, then test a conservative scenario before approving automation.