Finance Calculator
Net Profit Margin Calculator
Calculate your net profit margin from revenue and total costs. Understand what your bottom-line profitability means for lender assessment and business health.
Enter your revenue and costs
How is net profit margin calculated?
Net profit margin is calculated by subtracting all costs and expenses from revenue to find net profit, then dividing by revenue and expressing the result as a percentage.
Net Profit = Revenue − Total Costs & Expenses
Net Profit Margin (%) = (Net Profit ÷ Revenue) × 100
For example, if revenue is £1,000,000 and total costs are £850,000, net profit is £150,000, giving a net profit margin of 15.0%.
Unlike gross margin, which only considers direct costs, net profit margin accounts for every expense the business incurs — making it the most comprehensive measure of profitability.
Assumptions and caveats
- •Total costs should include COGS, operating expenses, depreciation, interest, and tax.
- •Ensure revenue and costs relate to the same accounting period for an accurate margin.
- •One-off or exceptional items can distort net margin — consider adjusting for these when comparing periods.
- •Net profit margin benchmarks vary significantly by sector: compare like-for-like within your industry.
- •This calculator provides an indicative assessment. Speak to an accountant for formal profit analysis.
Frequently asked questions
Net profit margin is the percentage of revenue that remains as profit after deducting all expenses, including cost of goods sold, operating expenses, interest, and tax. It is the definitive measure of bottom-line profitability and shows how much of every pound of revenue translates into actual profit.
A good net profit margin varies by industry. Service businesses may achieve 15–30%, while manufacturing or retail may operate at 5–15%. Generally, above 20% is considered strong, 10–20% is healthy, 5–10% is moderate, and below 5% is thin. Negative margins indicate a loss-making business.
Gross margin only deducts cost of goods sold (COGS) from revenue, measuring production efficiency. Net margin deducts all costs — COGS, operating expenses, interest, depreciation, and tax — giving a complete picture of overall profitability after every expense is accounted for.
Lenders examine net profit margin to assess whether a business generates sufficient profit to service debt. A healthy margin indicates the business can absorb cost increases or revenue dips while still meeting loan repayments. It is a key indicator of financial resilience and creditworthiness.
Need help improving profitability?
Better financing structures can reduce your cost base and improve margins. Talk to the Spark team about competitive business finance options.
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