What is project profit margin?
Project profit margin shows what proportion of revenue remains after the costs included in your calculation. The most useful first step is to define whether you are measuring gross project margin (direct project costs only) or an operating-style margin that also includes allocated overhead. Never compare percentages that use different cost definitions.
The three essential formulas
Project profit = project revenue − project cost. Project margin (%) = project profit ÷ project revenue × 100. Markup (%) = project profit ÷ project cost × 100. Margin uses revenue as the denominator; markup uses cost. They are not interchangeable.
A worked example
Imagine a fixed-price project worth €30,000, excluding VAT or sales tax. Materials cost €7,000, loaded labor €9,000, equipment €2,000, subcontractors €3,000 and allocated overhead €3,000. Total modeled cost is €24,000. Profit is €6,000 and margin is 20%. Markup on cost is 25%. All amounts are illustrative.
How to calculate a target selling price
If your full estimated cost is €24,000 and you need a 20% margin, calculate price = cost ÷ (1 − target margin). That gives €24,000 ÷ 0.80 = €30,000. Adding 20% markup instead would give €28,800, which yields only a 16.7% margin.
What costs should you include?
Start with materials and consumables, employee time including employer costs, equipment and vehicles, subcontractors, travel, permits and disposal. Then decide how to allocate office expenses, insurance, administration and other overhead. Avoid double-counting costs already included in an hourly rate.
Track margin during the project
An estimate is not the final result. Update actual costs as invoices and timesheets arrive. Track approved variations separately and compare the latest expected final cost with the contract value. A project that starts with a healthy margin can still finish below target if extra hours go unrecorded.
Practical checklist
Before sending a quote, confirm the scope, estimate quantities and hours, include realistic overhead, choose a target margin, check the difference between margin and markup, and document assumptions. During delivery, review committed and actual costs every week or at milestones.
Examples are illustrative, exclude applicable taxes unless stated, and are provided for general educational purposes. Check local regulations and consult a qualified adviser for decisions specific to your business.