Industrial Equipment, Machinery & Capital Goods calculator

Engineering Change Impact Calculator

Use this calculator to estimate the financial impact of an engineering change on a machinery project. It helps engineering, project management, and sales decide whether change order pricing, contingency, or scope control is needed.

What this calculator does

  • Calculate the margin impact of an engineering change using available change budget, required change cost, and project revenue basis.
  • Use it when deciding whether ECOs, customer changes, supplier substitutions, or design fixes need change order recovery.
  • The result shows whether the change is covered and how large the gap is against the selected project basis.

Formula used

  • Engineering change cost gap = available change budget - required engineering change cost
  • Engineering change impact = cost gap รท project revenue or budget basis

Inputs explained

  • Available change budget: Use remaining contingency, approved change order value, customer funded change budget, or internal project reserve.
  • Required engineering change cost: Include engineering hours, purchased parts, rework, documentation, testing, supplier cost, and schedule recovery effort.
  • Project revenue or budget basis: Use quoted project revenue, machine selling price, project cost budget, or approved change control basis.

How to use the result

  • Use it to support change order pricing, scope decisions, and margin protection.
  • It depends on accurate cost estimates, recovery assumptions, and final customer approval.

Common questions

  • What is the engineering change impact calculator for? It estimates the financial impact of an engineering change on a machinery project.
  • What information should I enter? Use available change budget, required change cost, and project revenue or budget basis.
  • What does the result tell me? The result helps decide whether change order recovery or contingency use is needed.
  • When is the result only an estimate? It is only an estimate when change scope, recovery pricing, or implementation cost changes.

Last reviewed 2026-05-12.