What this calculator does
Operational availability is operating time ÷ (operating + repair + delay time). It exposes readiness losses outside the wrench-time portion of maintenance.
When to use it
Use it when parts waiting, access restrictions, approvals, transportation, or staffing affect availability experienced by operations.
Inputs and formula
Active repair time includes diagnosis and restoration according to your work-order standard. Delay time captures support delays that prevent return to service.
Worked example and interpretation
400 operating hours, 8 repair hours, and 12 delay hours produce 95.2% operational availability. The gap from inherent availability points to support-system opportunity.
Practical notes and limitations
Planned shutdowns and lack-of-demand periods need an explicit policy. Compare definitions before benchmarking sites. The availability definitions reference documents common boundaries.