Aftermarket, Field Service & Service Parts worked example

Service Backlog Workload at 30% parts and scheduling delay allowance: a worked example

This worked example runs the service backlog workload numbers for a tougher week than the baseline: 30% parts and scheduling delay allowance instead of the typical 42%. Estimate service backlog hours from open work orders, close rate, and allowance for dispatch complexity or parts delays.

The inputs for this scenario

  • Open service work orders: 315 work orders (held at the documented default)
  • Work order closure pace: 0.55 work orders/min (held at the documented default)
  • Parts and scheduling delay allowance: 30 % (the input this scenario stresses; the baseline uses 42)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base closure time = open work orders รท closure pace.
  • Service backlog workload works out to 745 backlog hr at these inputs, and this is the headline figure for the scenario.
  • Base work order closure time works out to 573 backlog hr at these inputs.
  • Parts and scheduling delay allowance works out to 30 % at these inputs.
  • Work order closure pace works out to 0.55 work orders/min at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where parts and scheduling delay allowance sits at 42% and the headline result is 813 backlog hr, this scenario comes in 8.45% below the baseline at 745 backlog hr.
  • Use it when assessing whether to add field crews, forecasting backlog burn-down, or communicating realistic clear-out dates to customers or management. 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

  • Service backlog workload: 745 backlog hr (headline result)
  • Base work order closure time: 573 backlog hr
  • Parts and scheduling delay allowance: 30 %
  • Work order closure pace: 0.55 work orders/min

Run it with your numbers

  • To rerun this with your own numbers, open the live Service Backlog Workload calculator, set parts and scheduling delay allowance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.