Tunnel Boring & Heavy Civil Equipment worked example

TBM Quote Margin with available tbm quote margin amount of 63 value: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop available tbm quote margin amount to 63 value, then walk the calculation through step by step. Estimate tbm quote margin for tunnel boring and heavy civil equipment using production-ready inputs so teams can measure the gap between available and required amounts.

The inputs for this scenario

  • Available tbm quote margin amount: 63 value (the input this scenario stresses; the baseline uses 125)
  • Required tbm quote margin amount: 100 value (held at the documented default)
  • Reference tbm quote margin amount: 100 value (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Tbm quote margin amount gap = available tbm quote margin amount - required tbm quote margin amount.
  • Tbm quote margin works out to -37 % at these inputs, and this is the headline figure for the scenario.
  • Tbm quote margin amount gap works out to -37 value at these inputs.
  • Available tbm quote margin amount works out to 63 value at these inputs.
  • Required tbm quote margin amount works out to 100 value at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where available tbm quote margin amount sits at 125 value and the headline result is 25 %, this scenario comes in 248% below the baseline at -37 %.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to available tbm quote margin amount, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. Simple gross margin ignores financing carry, escalation over a multi-year build, warranty reserves, and risk contingency — a 25% gross figure can shrink materially by the time a TBM is delivered.

Results at a glance

  • Tbm quote margin: -37 % (headline result)
  • Tbm quote margin amount gap: -37 value
  • Available tbm quote margin amount: 63 value
  • Required tbm quote margin amount: 100 value

Run it with your numbers

  • To rerun this with your own numbers, open the live TBM Quote Margin calculator, set available tbm quote margin amount to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.