WMS, Warehouse Labor & Fulfillment worked example

Order Backlog at 12% setup, handling, and delay allowance: a worked example

Push setup, handling, and delay allowance up to 12% and the picture changes. This example computes every intermediate figure at that operating point. Use it when order backlog in wms, warehouse labor and fulfillment is being added to next week's schedule and you need an honest hours estimate.

The inputs for this scenario

  • Open orders in the backlog queue: 120 units (unchanged)
  • Fulfillment throughput rate: 12 units / min (unchanged)
  • Setup, handling, and delay allowance: 12 % (raised for this scenario; the documented default is 10)

Working through the calculation

  • Applying the documented formula (Base order backlog time = order backlog workload รท order backlog completion rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 11.2 hr for required order backlog time, the number this scenario is built around.
  • At this operating point the engine returns 10 hr for base order backlog time.
  • At this operating point the engine returns 12 % for order backlog allowance applied.
  • At this operating point the engine returns 12 pieces / min for order backlog completion rate.

How this compares with the baseline

  • Against the tool's baseline example, where setup, handling, and delay allowance sits at 10% and the headline result is 11 hr, this scenario comes in 1.82% above the baseline at 11.2 hr.
  • It computes the labor hours required to clear the current open-order backlog at a given throughput rate after adding a handling and delay allowance. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Required order backlog time: 11.2 hr (headline result)
  • Base order backlog time: 10 hr
  • Order backlog allowance applied: 12 %
  • Order backlog completion rate: 12 pieces / min

Run it with your numbers

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

Last reviewed 2026-05-12.