How to Calculate Your Profit Margin (And Why It Is the Most Important Number in Your Business)
📊 Financial Tracking · By Fincaly Team · · 6 min read
To calculate profit margin, subtract your total costs from your revenue to get profit, divide that profit by your revenue, and multiply by 100. The result is the percentage of every naira of sales that you actually keep. It is one of the clearest measures of business health.
If someone asked you right now what your profit margin is, could you answer with a real number? Many owners cannot, and that puts them at a disadvantage when they price, hire or plan.
How to calculate profit margin step by step
The formula is simple:
Profit margin = (revenue - total costs) ÷ revenue × 100
Here is a worked example. Your business earned ₦1,000,000 in a month. Your total costs, including stock, rent, salaries, transport and data, were ₦700,000.
- Profit: 1,000,000 minus 700,000 = ₦300,000
- Divide by revenue: 300,000 ÷ 1,000,000 = 0.30
- Multiply by 100: 30% profit margin
For every ₦100 of sales, you keep ₦30. The other ₦70 goes to costs.
Gross profit margin vs net profit margin
There are two margins every owner should know.
- Gross profit margin uses revenue minus the direct cost of what you sold, such as stock, materials and packaging. It ignores rent, salaries and other running costs. It tells you how well you produce or buy and sell your products.
- Net profit margin uses revenue minus every cost. It is your true bottom line.
If your gross margin is healthy but your net margin is thin, your running costs are the problem. If your gross margin is weak, look at your pricing and your suppliers first. Read our comparison of gross profit vs net profit for more detail.
What is a good profit margin?
It depends on your industry. Trading, food, services and manufacturing all behave differently. As a rough guide for small businesses:
- Under 15% is worth investigating
- 15 to 30% is fair
- 30 to 50% is healthy
- Above 50% is excellent, though it is uncommon in low-margin trades
More important than one number is the direction. Is your margin improving, holding or shrinking over time? Compare the same business month by month and year by year, and see how to compare your performance over time.
Why your margin might be lower than you think
Many owners are surprised when they calculate their margin for the first time. Common reasons include:
- Pricing too low out of fear of losing customers
- Underestimating the true cost of goods, including delivery and packaging
- Ignoring small recurring costs such as data, bank charges and subscriptions
- Giving discounts without checking what they do to profit
- Counting owner withdrawals as sales or leaving them out of costs
How to improve your profit margin
You have three levers: raise prices, lower costs, or sell a better mix of products.
- Review prices. Find your lowest-margin products and test small increases. Our guide to pricing for profit shows how.
- Cut costs that do not earn a return. List every expense, rank it by size and ask what you would lose if you removed it.
- Push your best products. Sell more of the items with the highest margin, not just the ones that sell most.
- Reduce waste. Spoilage, returns and unrecorded giveaways quietly reduce margin.
Profit margin examples by type of business
Margins differ because businesses are built differently. These illustrative examples show why you should compare yourself with your own past results first.
- A provision store might earn a small margin on each item but sell many items, so its margin per sale is thin and volume matters.
- A tailor or fashion brand may have a higher margin per outfit, but fewer sales and uneven months, so deposits and timing matter.
- A freelancer or consultant often has very little direct cost, so gross margin looks high, but time is the real cost, so profit per hour matters.
- A food business faces ingredient and gas costs that move often, so food cost percentage is the number to watch.
When you compare, use the same business over time rather than a stranger's number from the internet. A margin that moves from 18% to 24% over a year is real progress.
Margin versus markup: do not mix them up
Markup is the percentage you add to cost. Margin is the share of the selling price that is profit. They are not the same.
If an item costs ₦10,000 and you add a 50% markup, you sell it for ₦15,000. Your profit is ₦5,000, which is a 33% margin, not 50%. Owners who confuse the two often think they are earning more than they are.
To go from a target margin to a price, divide the cost by one minus the margin. For a 40% margin on a ₦10,000 item, divide 10,000 by 0.60 to get about ₦16,667.
Common mistakes when you calculate profit margin
- Leaving out costs. Delivery, packaging, bank charges and data all belong in your costs.
- Using the wrong period. Match revenue and costs to the same month.
- Counting cash received as revenue. Include sales made on credit when you earn them, and note what is still unpaid.
- Ignoring your own pay. If you work in the business, include a fair salary, or your margin is overstated.
- Doing it once. A single calculation only helps if you repeat it and watch the trend.
How Fincaly tracks and improves your margins
Fincaly's Unit Economics feature calculates the margin for every product from its cost price and selling price, rates it from Poor to Excellent and suggests the price you would need for a healthier margin. The Profit & Loss feature then shows your gross and net margin for any month or year.
Fincaly feature: Unit Economics. Calculate profit margins for every product and get pricing recommendations instantly. Explore Unit Economics
Find out your real profit margin today Start your 3-day free trial →
Next steps
Your profit margin is the health report of your business. Calculate it this week, record it every month, and make decisions that protect and grow it.
Cover photo by Towfiqu barbhuiya on Unsplash.
Frequently asked questions
What is the formula for profit margin?
Profit margin equals revenue minus total costs, divided by revenue, multiplied by 100. The answer is the percentage of sales you keep as profit.
What is the difference between gross and net profit margin?
Gross margin only subtracts the direct cost of what you sold. Net margin subtracts every cost, including rent, salaries and running expenses.
How often should I calculate my profit margin?
Monthly is a good rhythm for most small businesses, with a yearly summary to see the bigger trend.