Tunnel Boring & Heavy Civil Equipment worked example

TBM Quote Margin with available tbm quote margin amount of 310 value: a worked example

What does the result look like when available tbm quote margin amount reaches 310 value? The full calculation is worked below with real intermediate numbers. Use it when tbm quote margin in tunnel boring and heavy civil equipment needs a clean margin number for a tunnel boring and heavy civil equipment go / no-go review.

The inputs for this scenario

  • Available tbm quote margin amount: 310 value (raised for this scenario; the documented default is 125)
  • Required tbm quote margin amount: 100 value (unchanged)
  • Reference tbm quote margin amount: 100 value (unchanged)

Working through the calculation

  • Applying the documented formula (Tbm quote margin amount gap = available tbm quote margin amount - required tbm quote margin amount) to the inputs above produces each figure below.
  • At this operating point the engine returns 210 % for tbm quote margin, the number this scenario is built around.
  • At this operating point the engine returns 210 value for tbm quote margin amount gap.
  • At this operating point the engine returns 310 value for available tbm quote margin amount.
  • At this operating point the engine returns 100 value for required tbm quote margin amount.

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 740% above the baseline at 210 %.
  • A figure at this level is achievable when available tbm quote margin amount is genuinely sustained, not just peaked for a shift. 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: 210 % (headline result)
  • Tbm quote margin amount gap: 210 value
  • Available tbm quote margin amount: 310 value
  • Required tbm quote margin amount: 100 value

Run it with your numbers

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

Last reviewed 2026-05-12.