Net profit margin is what is left of every pound of revenue after every cost has been paid: direct costs, overhead, interest and tax. It is the bottom line as a percentage, and it is the figure that determines whether a business is genuinely profitable rather than merely busy. Unlike gross margin it hides nothing, which is why it is usually much smaller than people expect.
The distance between gross and net margin is the whole cost structure of the business. A company can hold a 70% gross margin and still lose money if overhead, sales costs and interest consume more than 70 pence of every pound. That gap is where operating discipline shows up, and tracking it over time is more informative than either margin alone.
Net margins vary enormously by sector and are strongly affected by leverage and tax. Supermarkets famously operate on two to four percent, while established software businesses can exceed twenty. A single year also says little: one-off legal costs, asset sales or write-downs can distort net margin far more than they distort gross margin.
The formula
revenue- Total sales for the period
costs- Cost of goods sold plus all operating expenses
interest- Interest paid on borrowings
tax- Tax charge for the period
How to use this calculator
- Enter revenue for the period.
- Enter total costs, including both direct costs and operating expenses.
- Add interest and tax separately so the effect of leverage is visible.
- The gauge shows net margin; the cost load and profit per sale appear below.
Worked examples
Revenue 800,000 with 690,000 of costs
Pre-tax profit is $92,000 after $18,000 of interest, a 11.50% pre-tax margin. Tax of $22,000 leaves $70,000 of net profit and a net margin of 8.75%.
How much revenue a cost saving is worth
At a 8.75% net margin, saving $10,000 of cost adds the same $10,000 to profit as $114,286 of extra revenue would. That multiple is why thin-margin businesses attack costs before chasing sales.
How to read your score
Frequently asked questions
What is the difference between gross and net margin?
Gross margin subtracts only direct production costs. Net margin subtracts everything, including overhead, interest and tax. The gap between them is the cost of running the business rather than the cost of making the product.
Should interest be included?
In net margin, yes — it is a real cost of the capital structure. If you want to compare operating performance across differently financed companies, use operating margin instead, which excludes interest and tax.
Why is my net margin negative when gross margin is healthy?
Because overhead is consuming more than the gross profit. Either fixed costs are too high for the current sales level, or volume has not yet reached the point where those costs are covered.
Is a higher net margin always better?
Not necessarily. Cutting marketing or research lifts this year’s net margin while damaging next year’s revenue. Read it alongside revenue growth rather than in isolation.
Net margin reference
| Revenue | costs at 70% of revenue | costs at 80% of revenue | costs at 85% of revenue | costs at 90% of revenue | costs at 95% of revenue | costs at 98% of revenue |
|---|---|---|---|---|---|---|
| $200000 | 30.0% | 20.0% | 15.0% | 10.0% | 5.0% | 2.0% |
| $500000 | 30.0% | 20.0% | 15.0% | 10.0% | 5.0% | 2.0% |
| $800000 | 30.0% | 20.0% | 15.0% | 10.0% | 5.0% | 2.0% |
| $1500000 | 30.0% | 20.0% | 15.0% | 10.0% | 5.0% | 2.0% |
| $3000000 | 30.0% | 20.0% | 15.0% | 10.0% | 5.0% | 2.0% |
Outgoings include cost of goods, overhead, interest and tax.
| Net margin | Profit from $10,000 saved | Revenue needed for the same profit |
|---|---|---|
| 2% | $10,000 | $500,000 |
| 3% | $10,000 | $333,333 |
| 5% | $10,000 | $200,000 |
| 8% | $10,000 | $125,000 |
| 10% | $10,000 | $100,000 |
| 15% | $10,000 | $66,667 |
| 20% | $10,000 | $50,000 |
| 30% | $10,000 | $33,333 |
A saved pound is worth several pounds of sales whenever margins are thin.