To calculate profit on sales, subtract your total costs from your total revenue. If you sold $10,000 worth of products and spent $7,000 to make and sell them, your profit is $3,000. That’s the core idea, but in practice there are three distinct levels of profit, each telling you something different about how your business is performing: gross profit, operating profit, and net profit.
Gross Profit: Your Starting Point
Gross profit measures how much money you keep after covering the direct costs of producing or purchasing what you sell. The formula is straightforward:
Gross Profit = Revenue − Cost of Goods Sold (COGS)
COGS includes only the expenses directly tied to making or buying your product. For a manufacturer, that means raw materials, production labor, and factory overhead. For a retailer, it’s the wholesale price you paid for inventory. A bakery’s COGS would include flour, butter, eggs, and the wages of the bakers, but not the rent on the storefront or the cost of running Instagram ads.
A useful test for whether something belongs in COGS: would you still have this expense if you made zero sales? If yes, it’s not COGS. Marketing costs, office rent, and administrative salaries all fail that test and belong in a different category.
If your business brought in $200,000 in revenue last year and your COGS totaled $120,000, your gross profit is $80,000. To express that as a percentage (your gross profit margin), divide gross profit by revenue:
Gross Profit Margin = (Gross Profit ÷ Revenue) × 100
In this example, that’s ($80,000 ÷ $200,000) × 100 = 40%. This tells you that for every dollar of revenue, you keep 40 cents before paying rent, salaries, or any other overhead.
Operating Profit: What the Business Actually Earns
Operating profit goes a step further by subtracting the day-to-day expenses of running the business. These operating expenses include rent, utilities, office salaries, insurance, marketing, accounting fees, office supplies, and depreciation on equipment. The formula is:
Operating Profit = Gross Profit − Operating Expenses
Continuing the example above, if your $200,000 business had $80,000 in gross profit and $50,000 in operating expenses (rent, payroll for non-production staff, software subscriptions, advertising), your operating profit is $30,000. Your operating profit margin would be ($30,000 ÷ $200,000) × 100 = 15%.
Operating profit is sometimes called EBIT, which stands for earnings before interest and taxes. The two numbers are identical as long as your business has no income from side activities like investments. This figure shows whether your core business operations are profitable before financing costs and taxes enter the picture.
Net Profit: Your Bottom Line
Net profit is what’s left after everything has been paid, including interest on loans and income taxes. It’s the truest measure of what the business owner actually gets to keep.
Net Profit = Operating Profit − Interest − Taxes
If that $30,000 operating profit was reduced by $3,000 in loan interest payments and $5,400 in taxes, your net profit is $21,600. Your net profit margin would be ($21,600 ÷ $200,000) × 100 = 10.8%.
Net margin varies enormously by industry. Grocery retailers typically operate on razor-thin net margins around 1.3%, while software companies focused on systems and applications average roughly 25%. General retail falls around 5.6%, and business services firms land near 7%, according to data compiled by NYU Stern. Knowing your industry’s range helps you gauge whether your own margins are healthy or need attention.
Profit Margin vs. Markup
These two terms use the same numbers but measure different things, and mixing them up can lead to pricing mistakes.
- Profit margin is your profit expressed as a percentage of the selling price. If you sell a product for $100 that cost $70 to make, your profit margin is $30 ÷ $100 = 30%.
- Markup is your profit expressed as a percentage of your cost. Using the same numbers, your markup is $30 ÷ $70 = 42.9%.
The distinction matters when you’re setting prices. If someone tells you to apply a 30% markup to a $70 item, you’d price it at $91. But if they mean a 30% margin, you’d need to price it at $100. The higher the numbers, the bigger the gap between the two calculations. When discussing pricing with partners, suppliers, or employees, make sure everyone is using the same term.
Calculating Profit on a Single Sale
You don’t always need a full income statement. Sometimes you just want to know how much profit you make on one transaction. The simplest version:
Profit per Unit = Selling Price − Total Cost per Unit
If you sell handmade candles for $28 each and your materials, labor, and packaging cost $11 per candle, your gross profit per unit is $17. To get a fuller picture, you can allocate a share of your fixed costs (rent, website hosting, insurance) across your expected sales volume. If those fixed costs total $2,000 per month and you sell 400 candles, that’s $5 per candle in overhead. Your operating profit per candle drops to $12.
This per-unit view is especially useful for deciding which products to promote. A product with a lower selling price but higher per-unit margin may contribute more to your bottom line than a flashier item with thin margins.
A Complete Example
Suppose you run a small online store that sells custom phone cases. Here’s a simplified look at one month:
- Revenue: 500 cases sold at $25 each = $12,500
- COGS: Blank cases ($4), printing ($3), packaging ($1) = $8 per case × 500 = $4,000
- Gross Profit: $12,500 − $4,000 = $8,500 (68% margin)
- Operating Expenses: Website and software ($200), advertising ($2,500), shipping supplies ($300), virtual assistant ($1,000) = $4,000
- Operating Profit: $8,500 − $4,000 = $4,500 (36% margin)
- Interest and Taxes: $150 loan interest + $900 estimated taxes = $1,050
- Net Profit: $4,500 − $1,050 = $3,450 (27.6% margin)
Each level of profit reveals something actionable. If gross margin is strong but operating profit is weak, your overhead is eating into revenue. If operating profit looks good but net profit doesn’t, your debt load or tax situation needs attention.
How to Improve Your Profit on Sales
Once you can calculate your profit, the natural next step is increasing it. There are really only three levers to pull: raise revenue, lower COGS, or cut operating expenses.
On the revenue side, raising prices even slightly can have a dramatic effect. If you increase a $25 product to $27, your gross profit per unit jumps from $17 to $19, an 11.8% improvement, without selling a single additional unit. Test small price increases and monitor whether sales volume holds steady.
Reducing COGS often comes down to negotiating better rates with suppliers, buying materials in larger quantities, or finding more efficient production methods. Switching from one shipping carrier to another or sourcing a comparable material at a lower price point can shave dollars off each unit without affecting quality.
Cutting operating expenses means auditing your recurring costs. Software subscriptions you no longer use, advertising channels that don’t convert, and office space you could downsize are all common places where businesses leak money. Even small monthly savings compound over a full year. Trimming $300 per month in unnecessary expenses adds $3,600 to your annual net profit.