Net profit margin is the percentage of revenue remaining as profit after all expenses are paid. You calculate it by dividing net profit by revenue and multiplying by 100. If you made $500K in revenue and $100K in profit, your net profit margin is 20%. This metric tells you how much of every dollar you keep as profit after all costs including marketing, salaries, tools, overhead, and everything else. Net profit margin is critical for understanding business health because high revenue means nothing if expenses are eating everything and you’re barely profitable or losing money.
What Good Margins Look Like
Good net profit margins vary by business model. Service businesses might target 20% to 40% margins. Product businesses might be 10% to 20%. Software can be 30% to 60%+ at scale. What matters is whether your margins are healthy enough to reinvest in growth, pay yourself appropriately, build reserves, and whether they’re improving or declining over time. Declining margins as you scale is a red flag. It means you’re not achieving efficiency gains and you might be scaling unprofitably. Improving margins as you scale is healthy and shows you’re achieving leverage.
Improving Net Profit Margin
You improve net profit margin by increasing revenue without proportionally increasing costs, reducing costs without hurting revenue, raising prices which drops straight to profit, or improving efficiency in delivery which reduces fulfillment costs. Many businesses focus entirely on growing revenue while ignoring margin erosion from adding people and expenses faster than revenue grows. The most profitable businesses are obsessed with margin protection as they scale. They’re finding efficiency gains, they’re maintaining pricing power, and they’re ruthlessly cutting costs that don’t contribute to revenue. Small improvements in margin have huge impacts on actual dollars kept.