Free Net Profit Margin Calculator
Net profit margin is what's actually left after every cost, tax and interest payment. This calculator walks you through the full P&L waterfall — revenue to gross to operating to net — so you can see exactly where the money goes.
Results
Revenue
$100,000.00
− COGS → Gross profit
$60,000.00 (60.0%)
− Opex → Operating profit
$30,000.00 (30.0%)
− Tax/interest → Net profit
$25,000.00 (25.0%)
Revenue breakdown
- COGS40.0%
- Operating expenses30.0%
- Taxes & interest5.0%
- Net profit25.0%
What the Net Profit Margin Calculator does
Net profit margin is the percentage of revenue remaining after subtracting cost of goods sold, operating expenses, interest and tax — the bottom line of the income statement. It is the narrowest and most demanding of the margin family: gross margin only looks at production cost, net margin looks at everything.
Methodology and formula
Net Profit Margin % = (Revenue − COGS − Operating Expenses − Interest − Tax) / Revenue x 100, calculated stage by stage as Gross Profit, then Operating Profit, then Net Profit.
Worked example
- Inputs
- Revenue 200,000; COGS 80,000; operating expenses 70,000; interest & tax 20,000.
- Result
- Gross margin 60%; operating margin 25%; net margin 15%.
The business keeps 60 cents of gross profit per dollar of revenue, but overhead and financing costs strip that down to 15 cents of true net profit. Tracking all three stages shows whether a margin problem originates in production cost, operating overhead, or debt and tax load.
When to use this tool
Use this tool when you need the true bottom-line percentage after every cost, including overhead, interest and tax. Use the Gross Margin Calculator to isolate production efficiency alone, and the ROI Calculator when you're evaluating a specific investment rather than ongoing operating performance.
About the Net Profit Margin Calculator
The P&L waterfall
Revenue − COGS = Gross Profit. Gross Profit − Operating Expenses = Operating Profit. Operating Profit − Taxes & Interest = Net Profit. Each stage has its own margin percentage, and each tells you a different story.
What each margin tells you
Gross margin: is the product itself profitable? Operating margin: is the business efficient at running the operation? Net margin: after everyone else is paid, what's left for the owners? Investors look hardest at operating margin.
Benchmarks worth knowing
Net margin under 5% is fragile; 10% is healthy for most industries; 20%+ is exceptional. Software often runs 20–30% net; grocery retail runs 1–3%. Same net-dollar profit, very different business models.
Frequently asked questions
What goes in operating expenses?
Should I include owner salary?
Why is my operating margin lower than gross?
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