What this calculator measures
Contract profit depends on the quoted revenue and the full cost required to deliver the scope. Labor, materials, subcontractors, allocated overhead, and contingency should be estimated using the same project definition. Missing scope and change orders can matter more than small arithmetic differences.
The contingency input adds a percentage to the modeled base cost. It is a planning allowance, not guaranteed profit. If the contingency is consumed by actual cost overruns, the final project margin falls even though the original quote included the allowance.
Common use cases
Use this model when the inputs describe the same decision, period and customer or product scope.
- Estimate project profit and margin after labor, materials, subcontractors, overhead, and contingency.
- Use the result with the recorded inputs: Contract revenue, Labor cost, Materials, Subcontractors, Allocated overhead, Contingency on cost.
- Compare multiple scenarios before making a business decision.
Formula
A contingency allowance helps test whether the quoted price can absorb modeled cost uncertainty.
Formula breakdown
- Model only approved or supportable contract revenue.
- Include direct labor, materials, subcontractors and other delivery costs consistently.
Worked example
A $120,000 contract has $35,000 labor, $24,000 materials, $12,000 subcontractors, and $9,000 overhead. Base cost is $80,000. A 5% contingency adds $4,000, producing total modeled cost of $84,000, profit of $36,000, and margin of 30%.
Scenario comparison
A $120,000 contract with $90,000 delivery cost gives $30,000 estimated profit and 25% margin.
A $12,000 overrun cuts profit to $18,000 and margin to 15%.
How to interpret the result
Compare estimated cost with actual cost during delivery. A project can have a strong quoted margin but weak cash flow if deposits, milestone billing, retention, or supplier payments are poorly timed.
Use separate scenarios for known scope, probable risks, and severe risks. Contract terms, penalties, tax, insurance, and warranty obligations may need separate professional review.
What a good result looks like
Quoted margin should absorb delivery uncertainty, rework and overhead while still earning the required return.
Compare estimated margin with realized margin after completion.
Common mistakes
- Counting unapproved change orders as certain revenue.
- Omitting project-management, warranty, travel or similar attributable costs.
When this metric can mislead you
Quoted profit can disappear through scope creep, delay, penalties or retention.
Accounting profit does not guarantee positive project cash flow.
How to use the result in a decision
Use it during bid review and update it as commitments and forecasts change.
Track estimate, committed cost, actual cost and forecast-to-complete separately.
Assumptions and limitations
- Contract revenue reflects the amount expected to be earned for the modeled scope.
- Cost categories do not overlap or omit material delivery costs.
- Contingency is applied to base modeled cost.
- Timing, financing, tax, retention, and legal exposure are not modeled.