What This Calculator Shows You
Gross revenue is vanity. Net profit is sanity. This free Contractor Profit Margin Calculator shows you what you actually keep after paying for labor, materials, overhead, and operating expenses — so you can see the true health of your business, not just the top line. Whether you're evaluating a single job or your entire operation, understanding your real profit margin is the first step to building a business that pays you well.
Many contractors who have been in business for years don't actually know their net profit margin. They know they're busy. They know revenue is up. But they also know money always seems tight, and they can't explain exactly where it goes. This calculator cuts through the noise and shows you the number that actually matters: how much of every dollar you earn do you get to keep?
How to Use This Calculator
Enter total revenue for the period
Use a full month or quarter for accuracy. Spot-checking a single week can be misleading due to seasonality and payment timing.
Enter total cost of goods sold (COGS)
COGS includes all direct costs: technician wages, materials, subcontractors, and any direct job costs. Do not include overhead here.
Enter total operating expenses
This is your overhead: rent, admin salaries, insurance, marketing, software, vehicles, and owner draw (if not included in COGS).
Review gross margin and net margin
Gross margin = (Revenue − COGS) / Revenue. Net margin = (Revenue − COGS − Overhead) / Revenue. Target: 10–18% net margin.
Identify your biggest cost category
If gross margin is healthy but net margin is poor, you have an overhead problem. If gross margin is poor, you have a pricing or labor efficiency problem.
Industry Benchmarks
Healthy HVAC net profit margin: 10–18%
Top-performing residential HVAC companies run 15–20% net margins. Below 8% is unsustainable.
Source: Nexstar Network Benchmarks
Target gross margin for service work: 50–60%
Gross margin before overhead allocation. This gives room to cover fixed costs and leave 10–18% net.
Source: Service industry standards
Average plumbing company net margin: 8–15%
Plumbing margins vary by job mix. Service/repair runs higher margins than new construction work.
Source: PHCC Business Benchmarks
Electrical contractor net margin: 6–12%
Commercial electrical runs thinner margins than residential service; residential service/repair is most profitable.
Source: NECA Industry Data
Owner compensation should be separate from profit
Many contractors underpay themselves, which inflates apparent margin. Pay yourself market rate, then measure profit.
Source: Business finance best practices
The Complete Guide to Contractor Profit Margin
Profit margin tells you more about your business than any other single number. Revenue shows you how busy you are. Profit margin shows you whether that busyness is building wealth or just sustaining operations.
The two margins every contractor needs to track
Gross margin measures how efficiently you deliver your service. It's revenue minus your direct costs (labor and materials), divided by revenue. If you do $50,000 in revenue in a month with $25,000 in direct costs, your gross margin is 50%.
Net margin is what's left after overhead. Take that 50% gross margin, subtract $15,000 in monthly overhead (rent, insurance, trucks, admin), and your net margin on $50,000 revenue is 20% — $10,000 in profit.
Most contractors only track gross revenue and bank balance. They don't know their margins at all. When cash is tight, they assume it's a revenue problem and chase more jobs. But more jobs with bad margins just means more work for the same thin profit.
The overhead problem
The most common reason for low net margins isn't low revenue — it's overhead that grew with the business but was never rationalized. You added a truck, hired an admin, started paying for dispatch software, added liability riders, and joined a trade association. Each decision made sense in isolation. Together, they may be consuming profit you didn't account for.
The fix is to calculate your overhead per job (total monthly fixed costs ÷ jobs completed) and verify that your pricing accounts for it. If your overhead is $18,000/month and you complete 90 jobs, you need $200 per job just to break even on overhead before touching profit.
How to improve your margins
- Raise prices: The most direct lever. A 10% price increase on $500,000 in revenue is $50,000 more profit.
- Improve job efficiency: More jobs per truck per day at the same price = better margins.
- Upsell service agreements: Maintenance agreements generate high-margin recurring revenue.
- Cut underperforming overhead: Review every fixed cost annually.
Know your numbers. The contractors who build real wealth aren't necessarily the busiest ones — they're the ones who know where every dollar goes.
Why This Matters for Your Business
Profit margin is the ultimate scorecard for your business. High revenue with low margins means you're working harder for less. When you know your margin, you can identify exactly where the leaks are — overpriced labor, underpriced jobs, bloated overhead, or all three — and fix them systematically.
Pro Tips from Top Contractors
Separate your owner salary from profit in your analysis. Many contractors show 'profit' that is actually just their own underpaid labor.
Calculate margin by job type — service calls, installs, maintenance agreements — to find your most profitable work mix.
Benchmark your margin quarterly. A trend line matters more than any single data point.
If your gross margin is fine but net margin is poor, start with your overhead. The fastest fix is usually in fixed costs.