Contractor Profit Margin Calculator Guide

A profit margin calculator is only as good as what you put into it. The most common mistake is entering only materials and labor and skipping overhead — the truck payment, insurance, office costs, and your own admin time that a job has to help cover even though it's not billed line by line. If overhead isn't in the calculation, your 'profit' number is fiction.

Start with total job revenue, subtract direct costs (materials, labor, subcontractors, permits, equipment rental for that job), then subtract a fair share of your monthly overhead allocated to that job based on its size or duration. What's left is your real profit.

Margin is profit divided by the sale price. Markup is profit divided by the cost. A $10,000 job that cost you $8,000 to deliver has $2,000 profit — that's a 20% margin but a 25% markup. Contractors who confuse the two consistently underprice jobs, because a target of '20% profit' calculated as markup on cost gives you a lower price than the same target calculated as margin on revenue.

Most residential trades run somewhere between 10% and 20% net profit margin after everything is accounted for; specialty and design-build work can run higher. If your calculator keeps spitting out single digits, the issue is almost never that customers won't pay more — it's usually that overhead is being underestimated or change orders aren't being billed.

Run last month's numbers through our Profit Calculator and compare it against a target of 15-20%. If you're consistently under that, the fix starts with the pricing conversation, not with cutting your own pay.