CMMS, EAM & Spare Parts Management worked example

Maintenance Work Order Backlog at 29% planning, parts staging, permits, and break-in allowance: a worked example

What does the result look like when planning, parts staging, permits, and break-in allowance reaches 29%? The full calculation is worked below with real intermediate numbers. a maintenance or asset-management team needs to size backlog recovery crews, prioritize planner effort, or decide whether overtime or contractor support is needed for a work order backlog

The inputs for this scenario

  • Open work order backlog items: 245 work orders (unchanged)
  • Average work orders closed per labor hour: 3.5 work orders / hr (unchanged)
  • Planning, parts staging, permits, and break-in allowance: 29 % (raised for this scenario; the documented default is 25)

Working through the calculation

  • Applying the documented formula (Base maintenance work order backlog time = open work order backlog items รท average work orders closed per hour) to the inputs above produces each figure below.
  • At this operating point the engine returns 90.3 hr for required maintenance work order backlog time, the number this scenario is built around.
  • At this operating point the engine returns 70 hr for base maintenance work order backlog time.
  • At this operating point the engine returns 29 % for planning, parts staging, permits, and break-in work allowance applied.
  • At this operating point the engine returns 3.5 pieces / min for average work orders closed per hour.

How this compares with the baseline

  • Against the tool's baseline example, where planning, parts staging, permits, and break-in allowance sits at 25% and the headline result is 87.5 hr, this scenario comes in 3.2% above the baseline at 90.3 hr.
  • A figure at this level is achievable when planning, parts staging, permits, and break-in allowance is genuinely sustained, not just peaked for a shift. It assumes every open work order takes the same average effort, so a backlog skewed toward a few large overhauls or many quick inspections will not match reality; weight by job size or split emergency from planned work for accuracy.

Results at a glance

  • Required maintenance work order backlog time: 90.3 hr (headline result)
  • Base maintenance work order backlog time: 70 hr
  • planning, parts staging, permits, and break-in work allowance applied: 29 %
  • average work orders closed per hour: 3.5 pieces / min

Run it with your numbers

  • Every input above is editable in the live Maintenance Work Order Backlog calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.