A gross profit margin of 40% means that 40 cents of every dollar in total revenue is retained as gross profit after accounting for the direct costs of producing and selling the goods or services. The remaining 60 cents covers operating expenses, interest, and taxes [1].
In a more complex example, if an item costs $204 to produce and is sold for a price of $340, the price includes a 67% markup ($136) which represents a 40% gross margin. This means that 40% of the $340 is profit. Again, gross margin is just the direct percentage of profit in the sale price.
When we look at this on a per product basis, a good margin is typically thought to be around 50-60%, because this doesn't factor in any other wider business costs, such as marketing and rent. If your fixed business costs are low, however, you can still turn a healthy profit with a lower margin than this.
If you sell this for £100 then your gross profit is £100 – £50 – £5 =£45. Some people prefer to also think about this as a percentage of sales which can be referred to as a gross profit margin (GP%). In this example the gross profit percentage is £45/£100 x 100 = 45%
Margin formula
Gross profit margin is a measure of a company's financial health and efficiency in producing goods. It is calculated by dividing gross profit (net sales minus cost of goods sold) by net sales then multiplying by 100%.
Differences between Gross Profit and Gross Margin
While gross profit and gross margin are measures of a company's profitability, they reveal different information about its financial health. Gross profit is an absolute dollar amount, while gross margin is a percentage.
A gross profit margin of over 50% is healthy for most businesses. In some industries and business models, a gross margin of up to 90% can be achieved. Gross margins of less than 30% can be dangerous for businesses with high gross costs.
The Rule of 40 says that the sum of the revenue growth rate and the profit margin should be 40% or higher. Because this metric takes into account both growth and profit, it allows investors and stakeholders a way to quickly determine whether a SaaS company is balancing growth with profitability.
If your gross margin is between 40% and 50%, you're at a critical juncture. You'll need to decide between investing in your business or having a profit. If your gross margin is lower than 40%, you're most likely losing money, and you'll need to make a plan to pivot quickly.
That 40% margin means your business keeps $0.40 in gross profit for every $1 of sales before accounting for other operating expenses. Both metrics are important—but gross profit margin helps you benchmark efficiency and performance more accurately over time.
Profit Margins Provide a More Realistic Perspective
While profits are measured in dollars, the profit margin is measured as a percentage, or ratio, specifically, the ratio between net income (profit) and total sales.
Calculating GP Percentage
Net income goals differ depending on the expected returns on investment by the owners. Generally speaking, a solid and healthy net income goal is 20% of revenues for a mature company.
Divide gross profit by revenue: $20 / $50 = 0.4. Express it as percentages: 0.4 * 100 = 40%.
If you sell something for $100 with a 30% margin, you keep $30 as profit, and $70 goes to cover costs. This translates to approximately a 42.9% markup on the original cost. A 1.25 markup multiplier means the selling price is 1.25 × cost. Example: If your cost is $100, the selling price is $125.
Here are some general rules of thumb for gross margins:
20%: Healthy for manufacturers, distributors, and other businesses with physical production costs. 30-50%+: Solid margins for most service-based businesses with low overhead and production costs.
For established business owners, understanding gross profit margin is crucial for long-term success. A 40% or higher margin acts as a buffer for managing overheads and cash flow. Keeping overheads at 20-25% can lead to a net profit of at least 15%, signalling a strong business.