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Contractor Overhead and Profit Calculator

GMP contracts stack O&P on top of direct hard costs. Overhead covers home office, estimating, project management. Profit is the contractor's margin. Bond and builders risk are common adders. This calculator sums them to reach total contract value and reports effective markup.

Direct hard cost (subs + materials)

General overhead %

Profit %

Bond %

Builders risk insurance %

GMP contract value

$5,197,500

General overhead $

$360,000

Profit $

$270,000

Performance bond $

$45,000

Builders risk insurance $

$22,500

Total O&P markup on hard cost

15.50%

Markup as % of GMP

13.42%

How the math works

Contractor O&P = general overhead (home office, estimating, project management) + profit. Typical: OH 6-10%, profit 4-8%. Smaller contractors have higher OH (less volume absorbs home office). Fast-track commercial projects push profit higher due to schedule pressure.

Performance bond and builders risk insurance are typically 1-1.5% combined. Some owners require them; others self-insure for cost savings on smaller projects.

Editorial noteMaintained by EveryCalc - Reviewed June 2026

EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.

Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.

Learn more about our review process on the EveryCalc methodology page.

How this calculator works

What this page estimates

This Contractor Overhead and Profit Calculator is built to give a quick, browser-based estimate for contractor overhead and profit. GMP contracts stack O&P on top of direct hard costs. Overhead covers home office, estimating, project management. Profit is the contractor's margin. Bond and builders risk are common adders. This calculator sums them to reach total contract value and reports effective markup. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.

Calculation approach

The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For finance tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.

Example workflow

For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.

Practical checks

Use current, real-world numbers when the result affects money, health, tax, or legal decisions.
Run a low, base, and high case when the inputs are estimates.
Check the related calculators below when the next decision depends on a different assumption.

How to interpret the contractor overhead and profit result

Best use

Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.

Cross-check

Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.

Watch for

Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.

This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.

Before relying on this contractor overhead and profit estimate

Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.

Confirm source numbers

Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.

Separate cash flow from total cost

A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.

Run conservative cases

Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.

Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.

How to Use

Enter direct hard cost (subs + materials).
Enter overhead and profit percentages.
Enter bond and builders risk insurance percentages.
Read total GMP and markup breakdowns.

Frequently Asked Questions

OH vs profit — what's the difference?

Overhead is recoverable cost of running the business — home office salaries, insurance, vehicles. Profit is margin above all costs. Combined O&P is typically 12-18% of hard cost on commercial projects.

When is bond required?

Public work almost always requires performance bond. Private work depends on owner/lender preferences. Bond cost 0.5-1.5% of contract value, charged through GC.

Cost-plus vs GMP?

Cost-plus = owner pays actual cost + fee. GMP = contract cap; contractor eats overruns above GMP. Most commercial work is GMP with shared-savings clauses for under-run.