CMMS, EAM & Spare Parts Management worked example

Maintenance Work Order Backlog at 18% planning, parts staging, permits, and break-in allowance: a worked example

This worked example runs the maintenance work order backlog numbers for a tougher week than the baseline: 18% planning, parts staging, permits, and break-in allowance instead of the typical 25%. Estimate labor hours needed to clear open corrective, preventive, and follow-up work orders in the CMMS backlog.

The inputs for this scenario

  • Open work order backlog items: 245 work orders (held at the documented default)
  • Average work orders closed per labor hour: 3.5 work orders / hr (held at the documented default)
  • Planning, parts staging, permits, and break-in allowance: 18 % (the input this scenario stresses; the baseline uses 25)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base maintenance work order backlog time = open work order backlog items รท average work orders closed per hour.
  • Required maintenance work order backlog time works out to 82.6 hr at these inputs, and this is the headline figure for the scenario.
  • Base maintenance work order backlog time works out to 70 hr at these inputs.
  • planning, parts staging, permits, and break-in work allowance applied works out to 18 % at these inputs.
  • average work orders closed per hour works out to 3.5 pieces / min at these inputs.

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 5.6% below the baseline at 82.6 hr.
  • Use it in weekly backlog reviews, when justifying overtime or contractor support, or to track whether your backlog in crew-weeks is stable, growing, or being burned down. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Required maintenance work order backlog time: 82.6 hr (headline result)
  • Base maintenance work order backlog time: 70 hr
  • planning, parts staging, permits, and break-in work allowance applied: 18 %
  • average work orders closed per hour: 3.5 pieces / min

Run it with your numbers

  • To rerun this with your own numbers, open the live Maintenance Work Order Backlog calculator, set planning, parts staging, permits, and break-in allowance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.