Contractor Overhead Rate Calculator
Calculate the overhead burden rate to add to direct costs — the foundation of any contractor's pricing. Most contractor failures trace to underestimating overhead. Enter annual revenue, direct labor, direct materials, and five overhead categories to compute the overhead rate as a percentage of direct cost, overhead per direct labor dollar, and implied net margin. Benchmarks against the CFMA 8-15% range for small GCs.
Calculator
Adjust the inputs below; the result updates instantly.
Revenue and direct costs
Overhead categories
Overhead rate (% of direct costs)
- Overhead per direct labor dollar
- 0.36
- Total annual overhead
- $288,000.00
- Implied net margin at current revenue
- 15.6%
- Summary
- Annual revenue: $2,000,000. Direct costs: $1,400,000 (labor $800,000 + materials $600,000). Total overhead: $288,000 (rent/utilities $48,000 + insurance/bonding $36,000 + vehicle/equipment $60,000 + admin salaries $120,000 + marketing/misc $24,000). Overhead rate: 20.6% of direct costs. Overhead rate is ABOVE the CFMA 8-15% benchmark for small GCs — investigate high-cost categories. Overhead per direct labor dollar: 0.36× — for every $1 of field labor, the company spends 0.36 in overhead. Implied net margin at current revenue: 15.6%. CFMA benchmark: overhead should run 8-15% of direct costs for small GCs; specialty and custom builders 15-25%.
How this calculator works
This calculator computes the overhead burden rate — the foundation of any contractor's pricing model. It adds up all company overhead (rent, insurance, vehicles, admin salaries, marketing) and expresses it as a percentage of direct cost. That percentage is what must be added to every bid, on top of direct cost, before applying a net margin. Contractors who omit or underestimate overhead routinely bid work that appears profitable at the direct-cost level but produces no profit at the company level.
The CFMA (Construction Financial Management Association) benchmarks overhead at 8-15% of direct cost for small general contractors. Specialty and custom builders typically run 15-25% because of higher admin and design overhead. This calculator shows where the business sits relative to that benchmark.
Why overhead is the most dangerous cost in construction
Overhead costs are invisible at the job level. A carpenter on-site sees labor and materials; the estimator sees direct cost; but neither sees the office rent, the GM's salary, or the GL insurance premium that the company must pay whether the job makes money or not. The contractor who prices work as "direct cost plus 15%" without computing the actual overhead rate is guessing — and in construction, that guess is usually too optimistic.
The two most common overhead failures:
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Under-allocation: estimators include field labor and materials but forget to allocate office salaries, estimating time, and insurance. The bid is priced at direct cost plus a thin markup, and the company operates at near-breakeven.
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Stale allocation: overhead was computed at startup or during a smaller revenue period and never updated. As the business adds office staff, fleet vehicles, and admin infrastructure, overhead grows — but the bid overhead allocation stays at the old lower rate.
What counts as overhead vs. direct cost
| Direct cost | Overhead | |---|---| | Field labor (foreman, carpenters, laborers) | Office manager, bookkeeper, estimator salaries | | Installed materials (lumber, concrete, finishes) | Office rent and utilities | | Subcontractor bids | General liability insurance | | Rented equipment for specific project | Fleet vehicles not allocated to projects | | Project-specific insurance (builders' risk) | Marketing and advertising | | Permits for specific project | Accounting and legal professional fees |
The key test: would this cost exist if the project did not? Direct costs exist because of specific projects; overhead exists because the business exists.
Using the overhead rate in bid pricing
Once the overhead rate is computed, it becomes part of the bid formula:
Bid price = direct cost × (1 + overhead rate) / (1 - target net margin)
For a contractor with 12% overhead and a 10% net margin target:
- Direct cost of $500,000
- With overhead: $500,000 × 1.12 = $560,000 (fully-loaded cost)
- Bid price: $560,000 / (1 - 0.10) = $622,222
The equivalent markup on direct cost is 24.4%. A contractor who "adds 15% to cost" on this job would bid $575,000 — under-recovering overhead by $47,000 and earning only a 2% net margin instead of 10%.
Direct costs are expenses that can be attributed to a specific project: field labor on that project, materials installed on that project, subcontractors hired for that project, equipment rented for that project. Overhead is the cost of running the business that cannot be attributed to any single project: office rent, estimating salaries, general liability insurance, the owner's salary when not billing project time, accounting software, marketing. The distinction matters because direct costs can be bid and priced at the project level; overhead must be recovered across all projects by adding an overhead load to the bid price. Contractors who omit overhead from bid pricing routinely operate at breakeven or below — the direct-cost bids cover field costs but leave nothing for the business to run on.
Resources
Links marked sponsoredmay earn The Fennec Lab a commission. They do not affect the calculator's output. See disclosures.
- CFMA — Construction Financial Management Association — CFMA publishes the annual Construction Industry Annual Financial Survey — the most-cited benchmark for construction overhead percentages, net margins, and balance-sheet ratios. The 8-15% overhead benchmark for small GCs comes from CFMA survey data.
- AGC — Associated General Contractors of America — AGC publishes economic research on construction overhead allocation, labor-market data, and project-delivery benchmarks across commercial and infrastructure construction.