Revenue can look great on paper and still leave you wondering where the money went.
A business might bring in $10,000 this month, but that number alone doesn't tell you whether the month was actually profitable. What matters is how much is left after the costs required to generate those sales.
That's exactly what this calculator is designed to show you. Enter your revenue and total costs below, and you'll immediately see your estimated profit and profit margin.
Free Profit Margin Calculator
Use the same time period for both numbers. If you're entering monthly revenue, for example, enter monthly costs too.
Revenue ($)
Total Costs ($)
Note: This calculator provides a simple estimate for educational purposes. Your accounting or tax treatment may differ depending on your business.
What does your profit margin actually tell you?
Profit margin answers a more useful question than “How much did I sell?” It shows how much of your revenue is left after the costs you're measuring.
Here's the basic math:
Profit Margin = (Profit ÷ Revenue) × 100
Say your business generates $10,000 in revenue and you have $7,000 in costs. That leaves $3,000 in profit.
$3,000 divided by $10,000 gives you a 30% profit margin. In everyday terms, you're keeping about 30 cents from every dollar of revenue after the costs included in your calculation.
The tricky part isn't the formula. It's deciding what counts as a cost.
This is where small business owners can get very different answers from the same calculator.
If you're measuring the profitability of one product, your costs might include inventory, raw materials, packaging, shipping, marketplace fees, or payment-processing fees.
If you're looking at the business as a whole, you'll probably need a wider view. Payroll, rent, insurance, advertising, software subscriptions, utilities, professional services, and other operating expenses can all affect what you're actually keeping.
Before comparing your margin with somebody else's, make sure you're comparing the same type of profit.
Gross margin vs. net margin: what's the difference?
Gross profit margin
Gross margin generally focuses on revenue after the direct costs associated with producing or acquiring what you sell. It's especially useful when you're evaluating pricing and product economics.
Net profit margin
Net margin looks further down the income statement and takes a broader range of business expenses into account.
So when another business owner says, “We have a 35% margin,” there's an important follow-up question:
Do you mean gross margin or net margin?
Without that distinction, the comparison may not tell you very much.
Is a 20% profit margin good?
It can be—but there isn't one magic percentage that defines a healthy business.
A consultant working from a home office has a completely different cost structure from a restaurant, construction company, retail store, or ecommerce business. A margin that looks excellent in one industry may be difficult or even unrealistic in another.
Instead of chasing one universal benchmark, start by watching your own numbers over time.
If revenue keeps climbing while your margin keeps falling, that's worth investigating. Maybe supplier costs have increased. Maybe you're discounting more often. Maybe advertising is getting more expensive, or a few recurring expenses have quietly piled up.
“Sales are up. So why am I not making more money?”
This is where profit margin becomes particularly useful.
Imagine your monthly revenue rises from $20,000 to $25,000. On the surface, that's a strong 25% increase in sales.
But suppose your costs rise from $15,000 to $20,000 at the same time.
Your profit was $5,000 before the growth—and it's still $5,000 afterward.
You processed another $5,000 in sales without adding another dollar of profit.
That's why a busy business isn't automatically a more profitable business.
How can you improve your profit margin?
“Raise prices and cut expenses” is technically correct, but it's not particularly useful advice by itself. A better approach is to find out where your margin is actually being lost.
1. Find the products that really make you money
Your highest-selling product isn't necessarily your most profitable one. Look at what remains after the costs associated with each product or service.
2. Review recurring expenses
One forgotten $30 subscription won't destroy a business. Ten unnecessary subscriptions are a different story. Software, memberships, processing services, and automatic renewals deserve an occasional review.
3. Watch discounts
A discount comes directly out of your selling price, so its effect on profit can be larger than it first appears. Before running a promotion, calculate what the lower price does to your margin.
4. Don't confuse markup with margin
This is an easy pricing mistake to make.
Suppose a product costs you $60 and sells for $100. Your profit is $40.
That $40 represents a 40% profit margin based on the $100 selling price, but approximately a 66.7% markup based on the $60 cost.
Same sale. Very different percentages.
5. Recalculate when your costs change
A price that worked six months ago may not work today. Supplier prices, wages, shipping, advertising, insurance, and card-processing fees can all move while your selling price stays exactly the same.
A five-minute monthly habit worth keeping
Once a month, write down four numbers:
Revenue → Costs → Profit → Profit Margin
You don't need sophisticated software to make this useful. Even a simple spreadsheet can reveal a trend that's easy to miss when you're busy running the business.
Pay particular attention when revenue and profit start moving in opposite directions. That's often the point where the numbers are trying to tell you something.
Frequently Asked Questions
Can a profit margin be negative?
Yes. If your costs exceed your revenue during the period you're measuring, you'll have a loss and the calculator will show a negative profit margin.
Can I calculate the margin on just one product?
Yes. Enter the revenue generated by that product and the relevant costs you're measuring against it. Just use the same approach when comparing one product with another.
Should I include my salary as a cost?
That depends on what you're trying to measure and how your business is structured. Owner compensation can be treated differently in different accounting and tax situations. For formal reporting, rely on your accounting records or a qualified professional.
How often should a small business check its profit margin?
Monthly is a practical starting point for many businesses. If your inventory costs, advertising expenses, or prices change frequently, you may want to check more often.
Is revenue or profit margin more important?
Neither number tells the whole story by itself. Revenue tells you how much you're selling. Profit tells you what remains. Margin helps you understand how efficiently those sales are turning into profit.
Know Your Break-Even Point Too
Profit margin tells you how much of your revenue you keep, but there is another number every business owner should know: the point where your sales finally cover your costs.
Use our Free Break-Even Calculator to estimate how many units you need to sell and how much revenue you need before your business reaches break-even.
The number matters—but the direction matters more
Your first profit-margin calculation gives you a snapshot. The real value comes when you have several snapshots to compare.
Run the numbers again after a price change, a supplier increase, a major promotion, or simply at the end of next month.
If your business is generating more revenue while keeping more of each dollar, that's meaningful progress. If sales are climbing but the percentage you keep is shrinking, you'll know where to start asking questions.