How to Calculate Profit Margin: Gross and Net Margin Formulas

Quick answer: To calculate profit margin, divide profit by revenue and multiply by 100. Gross margin = (revenue minus cost of goods sold) divided by revenue. Net margin = net profit divided by revenue. For example, $33,000 of net profit on $180,000 of revenue gives a net profit margin of 18.3%.

Knowing how to calculate profit margin tells you how much of every dollar you invoice actually stays in the business. Revenue can grow while margins quietly shrink, so this is one of the most useful numbers a small business owner can track. This guide covers the gross, operating and net margin formulas, a full worked example, how to check the margin on a single invoice, and how to price new work for a target margin. If the difference between revenue and profit is new to you, read revenue vs profit first.

The numbers in this guide come from two places: the invoices you send and your profit and loss report. The free invoice generator helps with the first by keeping prices, tax and totals on separate lines, which makes margin calculations straightforward.

What is profit margin?

Profit margin is profit expressed as a percentage of revenue. A 25% margin means that for every $100 of sales, $25 is left as profit at the level you are measuring. Because it is a ratio, margin lets you compare months of different sizes, compare jobs with each other, and spot problems that raw dollar figures hide.

There are three common margins, each using a different line from the income statement. They form a ladder: gross margin is always the highest, operating margin sits in the middle, and net margin is lowest, because each step down subtracts more costs.

Margin	Formula	Costs subtracted	What it tells you
Gross margin	(Revenue minus COGS) divided by Revenue x 100	Direct costs only: materials, subcontractors, direct labor	Whether your pricing covers the cost of delivering the work
Operating margin	Operating profit divided by Revenue x 100	Direct costs plus overheads: rent, software, marketing, admin salaries	How efficiently the business runs day to day
Net margin	Net profit divided by Revenue x 100	Everything, including interest and income taxes	How much of each sales dollar the owner actually keeps

Why margins differ so much between business types

There is no universal "good" profit margin, because the cost structure of each business model is different. A consultant, copywriter or bookkeeper sells mostly their own time and has very few direct costs, so gross margin can be high, and the real pressure is on overheads and the owner's pay. A retailer, caterer or contractor buys materials or stock for every sale, so gross margin is naturally lower and small changes in supplier prices move it quickly. A business that relies heavily on subcontractors sits somewhere in between.

That is why the most useful comparisons are your own margins over time, and margins of businesses with a similar model and size. Industry benchmark reports exist, but they mix very different firms, so treat any single figure as a rough reference point rather than a target.

For a deeper comparison of the two most common measures, see gross profit vs net profit.

Gross profit margin formula

Gross margin = (Revenue minus Cost of goods sold) divided by Revenue x 100

Cost of goods sold (COGS), sometimes called cost of sales or direct costs, includes only the costs that rise and fall with each job or product. For a product business that means inventory, materials and freight in. For a service business it usually means subcontractors, direct staff time, and materials used on client work. Our guide to cost of goods sold explains what belongs in it.

Gross margin is the number to watch when setting prices. If it is too thin, no amount of overhead cutting will make the business healthy.

Net profit margin formula

Net margin = Net profit divided by Revenue x 100

Net profit is the bottom line of your profit and loss statement: revenue minus COGS, minus operating expenses, minus interest and income taxes. It is the truest measure of overall profitability, but it is also affected by financing choices and tax, so many owners track operating margin alongside it.

Operating margin in between

Operating margin = Operating profit divided by Revenue x 100, where operating profit is gross profit minus operating expenses. It excludes interest and taxes, which makes it handy for comparing performance from year to year even if your loan or tax position changes.

How to calculate profit margin step by step

1. Pick the period. Use a full month, quarter or year so revenue and costs line up.
2. Find net revenue. Start with total invoiced sales, then subtract credit notes, refunds and discounts. Exclude sales tax or VAT collected, because that money is not yours.
3. Total your direct costs. Add up COGS for the same period.
4. Calculate gross profit and gross margin. Revenue minus COGS, then divide by revenue.
5. Subtract operating expenses. This gives operating profit. Divide by revenue for operating margin.
6. Subtract interest and taxes. This gives net profit. Divide by revenue for net margin.
7. Compare. Look at the same margins for previous periods to see whether you are improving.

Set up a simple monthly margin tracker

You do not need special software. A spreadsheet with one row per month and columns for revenue, COGS, gross profit, gross margin, operating expenses, operating profit, operating margin and net margin is enough. Fill it from your profit and loss report on the same day each month, add a column for notes such as "large one-off job" or "annual software renewal", and look at a rolling three-month average so one unusual month does not cause panic or false comfort.

If you use cash-basis books, margins can swing month to month based on when customers pay. Our guide to cash vs accrual accounting explains why accrual figures give a steadier picture.

Worked example: a small design agency's year

Here is a full calculation for a hypothetical design agency with one owner, a part-time assistant and freelance subcontractors.

Line	Amount	Margin
Revenue (invoiced, excluding sales tax)	$180,000	100%
Cost of goods sold: subcontractors, print, stock assets	($72,000)
Gross profit	$108,000	60.0%
Rent	($18,000)
Software and subscriptions	($6,000)
Marketing	($9,000)
Assistant wages and admin	($30,000)
Operating profit	$45,000	25.0%
Interest on equipment loan	($3,000)
Income taxes	($9,000)
Net profit	$33,000	18.3%

The arithmetic: $180,000 minus $72,000 = $108,000, and $108,000 divided by $180,000 = 60%. Operating expenses total $18,000 + $6,000 + $9,000 + $30,000 = $63,000, so operating profit is $108,000 minus $63,000 = $45,000, and $45,000 divided by $180,000 = 25%. Finally, $45,000 minus $3,000 minus $9,000 = $33,000, and $33,000 divided by $180,000 = 18.33%.

Comparing two years side by side

Margins become far more useful once you have a second period to compare. Suppose the following year the agency grows revenue to $200,000, but subcontractor rates rise and COGS reaches $88,000. Gross profit is $200,000 minus $88,000 = $112,000, a gross margin of 56%. Revenue grew by 11%, and gross profit still rose by $4,000, yet each dollar of sales now keeps four cents less. If overheads also rose to $70,000, operating profit would be $112,000 minus $70,000 = $42,000, or 21%, lower than the year before in both dollars and percentage. Without the margin calculation, the owner might celebrate the higher sales and miss the squeeze.

What the agency learns: its 60% gross margin is healthy for service work, but overheads consume 35 percentage points of it. A 10% rise in rent and software would barely move gross margin, yet it would cut operating margin noticeably. That is why tracking all three levels matters.

How to calculate the margin on a single invoice

Annual margins tell you how the business did. Per-job margins tell you which work to chase. Before sending a quote or a large invoice, run the gross margin on that job alone.

Example: the agency invoices a brand refresh at $2,500 plus sales tax. Direct costs were $650 for a freelance illustrator and $400 for printing, a total of $1,050. Gross profit is $2,500 minus $1,050 = $1,450, so the job's gross margin is $1,450 divided by $2,500 = 58%, slightly below the agency's 60% average. Note that the sales tax on the invoice is ignored: use the sales tax calculator to separate tax from the price if your totals include it.

If a job type consistently comes in below your average margin, that is a pricing problem, not a volume problem. Our guides on how to raise prices and value-based pricing cover what to do next.

Margin vs markup: the most expensive confusion

Markup is profit as a percentage of cost; margin is profit as a percentage of price. They are not interchangeable.

Cost	Price	Profit	Markup (profit / cost)	Margin (profit / price)
$100	$125	$25	25%	20%
$100	$150	$50	50%	33.3%
$100	$200	$100	100%	50%
$100	$250	$150	150%	60%

An owner who wants a 50% margin but adds a 50% markup ends up at 33.3%. Our full guide to markup vs margin includes conversion formulas.

Pricing for a target margin

To find the price that hits a target margin, use: Price = Cost divided by (1 minus target margin).

For the $1,050 job above, a 60% target gives $1,050 divided by 0.40 = $2,625. Check: $2,625 minus $1,050 = $1,575, and $1,575 divided by $2,625 = 60%. By contrast, adding 60% to cost gives $1,680, a margin of only 37.5%.

How to improve your profit margin

• Raise prices on low-margin work. Small increases on your weakest jobs often do more than chasing new clients.
• Reprice by value, not hours, for work where your expertise delivers a measurable result.
• Cut direct costs. Renegotiate subcontractor rates, reduce rework and scope creep, and bill for out-of-scope requests.
• Control overheads. Review subscriptions and fixed costs; our guide to fixed vs variable costs helps you see which ones scale.
• Bill everything you are owed. Reimbursable expenses, rush fees and late fees left off invoices come straight out of margin.
• Collect faster. Unpaid invoices do not change accrual margin, but bad debts do. Our sibling guide to the allowance for doubtful accounts shows how losses hit profit.

The U.S. Small Business Administration's guide to managing your finances recommends regularly comparing money in and money out to keep profit and loss in balance, which is exactly what margin tracking does.

Common profit margin mistakes

• Including sales tax in revenue, which inflates revenue and distorts every margin.
• Leaving the owner's time out of costs. A sole proprietor's 60% margin may hide the fact that no salary has been paid. See how to pay yourself as a business owner.
• Mixing periods, such as a month of revenue against a quarter of costs.
• Using markup and margin interchangeably when quoting.

Invoice clearly to track margins accurately

Learning how to calculate profit margin is only useful if your revenue figures are clean. Invoices that separate the price, discounts and tax make it simple to pull net revenue for any job or period. Create yours with the invoice generator, pick a layout from the invoice templates, and run the margin on every job before you hit send. It is free, needs no account, and exports a print-ready PDF invoice.