How Do You Calculate Profit? (gross, operating, and net)

Updated September 18, 2026

Profit is revenue minus costs. The whole question is which costs you subtract — and there are three useful answers.

The three profit numbers

Profit	Formula	What it tells you
Gross profit	Revenue − cost of goods sold	Whether your pricing works
Operating profit	Gross profit − operating expenses	Whether your business model works
Net profit	Operating profit − interest − tax	What you actually keep

A worked example

A small product business does $120,000 in sales over a year.

Cost of goods sold (materials, production labor, packaging, shipping): $54,000 → gross profit $66,000 (55% gross margin)
Operating expenses (rent $9,000, software $3,600, marketing $12,000, admin $18,000): $42,600 → operating profit $23,400
Interest $1,400 and tax $4,400 → net profit $17,600 (14.7% net margin)

Profit per sale vs profit per period

Profit per sale is price minus unit cost — useful for pricing decisions. Profit per period is revenue minus all costs for a month or year — useful for knowing whether the business is viable. A product can be profitable per sale and the business still lose money if volume doesn't cover fixed costs.

Three things that quietly destroy profit

Unpaid owner labor. If your time isn't in cost of goods sold, gross profit is fiction.
Fees. Marketplace and payment fees of 8–12% come straight out of gross profit.
Discounts and returns. Your average selling price is almost always below list. Measure profit on the average, not the list price.

Turning profit into a percentage

Divide profit by revenue. $17,600 ÷ $120,000 = 14.7% net margin. Percentages let you compare periods and businesses of different sizes; dollars tell you what's in the bank.

Frequently asked

Profit = revenue − costs. Gross profit subtracts only the cost of the goods sold. Operating profit also subtracts running costs like rent and software. Net profit subtracts everything, including interest and tax.

Profit is an amount of money. Margin is that profit as a percentage of revenue. $10 profit on a $30 sale is a 33% margin.

The three usual culprits are unpaid owner labor left out of costs, payment and platform fees not counted, and discounts or returns reducing the average selling price below list price.

Gross profit tells you whether your pricing works. Net profit tells you whether the business works. Watch both — strong gross profit with negative net profit means overhead, not pricing, is the problem.