Margin and pricing
Net profit margin calculator
Net profit margin is the share of revenue left after every cost, not just the cost of what you sold. Subtract total costs from revenue, divide by revenue, multiply by 100. It is the number that says whether the business works.
Net sales, after discounts and refunds
Every cost, including owner salary and tax
The formula
- Revenue
- Net sales for the period, after discounts and refunds. Use the same definition you use for gross margin, because the gap between the two figures is only meaningful if the top line is identical in both.
- Total costs
- Everything. Cost of goods, rent, salaries, software, professional fees, interest, tax, and the owner labour that usually goes uncounted. The instinct is to include the costs that arrive as invoices and quietly omit the ones that do not, and every omission moves this number in the same flattering direction.
A worked example
The outdoor gear brand books 400,000 of revenue for the quarter against 300,000 in cost of goods, leaving 100,000 of gross profit. Overheads run 87,000: salaries for the people not on the delivery side, rent on the unit, software, professional fees, and the 20,000 the acquisition programme consumed. Total costs are 387,000, net profit is 13,000, and the net margin is 3.25 percent. Thin, but positive.
The founder is not in that 87,000. They take drawings rather than a salary, so their labour never appears as a cost and whatever is left at the end is called profit. Replacing them would cost roughly 15,000 a quarter at market rate. Counted properly, total costs are 402,000 and the quarter is a 2,000 loss.
The brand is not running a business that makes 13,000 a quarter. It is running one that loses 2,000 and pays its founder 13,000 to work there. Both statements describe the same bank balance and only one of them supports a decision about whether to hire, expand, or sell. The gap between the 25 percent gross margin and the real net margin is 25 points of overhead, and a fifth of the gross profit is going to an acquisition programme the LTV to CAC ratio already showed is running at half the level it needs to.
When to use it
Net margin is the only measure here that answers whether the whole operation works. Everything else describes part of it. A business can hold a strong gross margin, an efficient acquisition cost, and a healthy return on individual projects while still losing money, and this is the number where that shows up.
Read it as the distance from gross margin rather than on its own, because that gap is your overhead expressed as a share of revenue, and the direction it moves is diagnostic. Gross margin falling with net following it means a pricing or cost of goods problem. Gross margin holding steady while net erodes means overhead is growing faster than revenue, which is a completely different conversation and usually a slower one to notice.
Watch the trend rather than the level. Published benchmarks are close to useless here because the figure depends so heavily on structure, but your own margin over eight quarters is one of the most informative things you can put on a single chart.
Where it misleads
Uncounted owner labour is the most common distortion in small businesses, and it does not announce itself. Where the owner draws profits instead of taking a market-rate salary, the reported margin includes the value of their work as though it were free. The test is simple: what would it cost to hire someone to do what you do. If the answer is more than what is left at the end of the year, the business is not yet profitable, whatever the accounts say.
The figure is poorly comparable between companies. One leases its premises while another owns them, one uses contractors while another employs staff, one carries debt and one does not, and all four differences move net margin without saying anything about whether the underlying business is better run. Gross margin comparisons across companies are shaky. Net margin comparisons are usually worse.
A single quarter is easily distorted by things that will not repeat. A legal settlement, an asset sale, a grant, a one-off rebate from a supplier. Any of them can move the margin by several points in a period where nothing about the business changed. Look at the figure with one-offs stripped out before drawing a conclusion from it.
Profit is not cash, and this is where otherwise healthy businesses fail. Margin can be positive while money is going out the door faster than it comes in, because inventory has to be bought before it sells and invoices have to be paid before they are collected. A growing business with a decent net margin and no working capital is a genuinely dangerous position, and nothing on this page will reveal it.
Frequently asked
What is a good net profit margin?
Around ten percent is a common reference point for an established small business, though the honest answer depends heavily on the industry and the structure. Early-stage companies often run negative on purpose while they invest. The trend across several periods carries far more information than the level in any one of them.
What is the difference between gross margin and net margin?
Gross margin subtracts only the direct cost of what was sold and shows whether the transaction works. Net margin subtracts every cost including overhead, interest, and tax, and shows whether the business works. The gap between them is overhead as a share of revenue.
Should the owner salary be included in costs?
Yes, at what it would cost to replace that person. Leaving it out counts the owner labour as free and reports their wages as profit. It is the most common reason a small business appears profitable on paper while the person running it is effectively subsidising it.
Can a business be profitable and still run out of money?
Routinely, and growth makes it more likely rather than less. Profit is recognised when a sale is made, cash arrives when the invoice is paid, and inventory has to be funded in between. A profitable business without working capital can fail while every margin on its accounts looks acceptable.
Is net margin the same as net profit?
No. Net profit is an amount of money and net margin is that amount as a percentage of revenue. Two businesses can report identical net profit on very different revenue, and the margin is what tells them apart.
Numbers are the easy part
Getting the calculation right takes two inputs. Getting an organization to agree on what counts as gain, what counts as cost, and what the number should change takes considerably longer.
That translation work is most of what I do. Westphal Solutions builds websites, tools, and reporting for nonprofits and growing teams, including the kind of measurement setup that makes a number like this one worth trusting in the first place.
Start a conversation