Tunnel Boring & Heavy Civil Equipment worked example

Assembly Bay Utilization at 61% target utilization: a worked example in tunnel boring & heavy civil equipment

Here is what the math looks like when conditions slip. We hold every other input steady and drop target utilization to 61%, then walk the calculation through step by step. Measure assembly bay utilization for Tunnel Boring & Heavy Civil Equipment — hours in use as a percentage of hours available.

The inputs for this scenario

  • Hours the assembly bay was in use: 320 hr (held at the documented default)
  • Hours the assembly bay was available: 400 hr (held at the documented default)
  • Target utilization: 61 % (the input this scenario stresses; the baseline uses 85)

Working through the calculation

  • The calculation starts from the formula this tool documents: Utilization = hours in use ÷ hours available.
  • Utilization works out to 80 % at these inputs, and this is the headline figure for the scenario.
  • Gap to target works out to -19 points at these inputs.
  • Used amount works out to 320 value at these inputs.
  • Available amount works out to 400 value at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where target utilization sits at 85% and the headline result is 80 %, this scenario lands almost exactly on the baseline at 80 %.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to target utilization, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. Occupancy is not the same as productive work — a bay can show 80% utilization while a machine sits parked waiting on a late gearbox, so pair this with an actual work-content metric before drawing conclusions.

Results at a glance

  • Utilization: 80 % (headline result)
  • Gap to target: -19 points
  • Used amount: 320 value
  • Available amount: 400 value

Run it with your numbers

  • To rerun this with your own numbers, open the live Assembly Bay Utilization calculator, set target utilization to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.