How to Calculate Profit Margin for Your Business: Simple Formula and Examples
You can make ₦1 million in sales and still have a business that is barely making money.
That is why sales alone cannot tell you whether your business is performing well.
One of the numbers you need to understand is your profit margin.
Profit margin tells you what percentage of your revenue remains as profit. In simple terms, it helps answer the question:
“Out of every ₦100 my business makes, how much do I actually keep as profit?”
The calculation is simple, but many business owners confuse profit margin with markup or calculate profit without including important costs.
Let's break it down.
The Problem
Imagine two businesses.
Business A makes ₦2,000,000 in sales in one month.
Business B makes ₦1,000,000.
At first glance, Business A appears to be doing better.
But suppose Business A spends ₦1,850,000 to generate those sales.
Its profit is only:
₦2,000,000 − ₦1,850,000 = ₦150,000
Business B spends ₦700,000.
Its profit is:
₦1,000,000 − ₦700,000 = ₦300,000
Business B generated less revenue but more profit.
This is why looking only at sales can give you an incomplete picture.
What Is Profit Margin?
Profit margin expresses profit as a percentage of revenue.
The basic formula is:
Profit Margin = (Profit ÷ Revenue) × 100
For example:
Revenue = ₦500,000
Profit = ₦100,000
Profit margin:
₦100,000 ÷ ₦500,000 × 100 = 20%
This means the business generated ₦20 in profit for every ₦100 of revenue.
The same basic principle is used in different types of profit margins; what changes is which costs are deducted before calculating the profit figure.
How to Calculate Profit Margin Step by Step
Let's use a simple example.
Suppose you run a small fashion business.
During the month:
Total sales: ₦1,000,000
Cost of products sold: ₦600,000
Other business expenses: ₦200,000
First calculate your gross profit:
₦1,000,000 − ₦600,000 = ₦400,000
Then subtract the other business expenses:
₦400,000 − ₦200,000 = ₦200,000
Your net profit is therefore ₦200,000.
Now calculate the net profit margin:
₦200,000 ÷ ₦1,000,000 × 100 = 20%
Your business has a 20% net profit margin for that period.
What Is Gross Profit Margin?
Gross profit margin looks at what remains after the direct cost of the products or services sold has been deducted.
The formula is:
Gross Profit Margin = (Gross Profit ÷ Revenue) × 100
Where:
Gross Profit = Revenue − Cost of Goods Sold
For example:
Sales = ₦800,000
Cost of goods sold = ₦480,000
Gross profit:
₦800,000 − ₦480,000 = ₦320,000
Gross profit margin:
₦320,000 ÷ ₦800,000 × 100 = 40%
So the business has a 40% gross profit margin.
This does not mean the owner gets to take the entire ₦320,000 home.
The business may still need to pay rent, salaries, transportation, electricity, marketing, bank charges and other operating costs.
What Is Net Profit Margin?
Net profit margin goes further.
It considers the profit remaining after the relevant business expenses have been deducted.
The formula is:
Net Profit Margin = (Net Profit ÷ Revenue) × 100
For example:
Revenue = ₦800,000
Cost of goods sold = ₦480,000
Other expenses = ₦200,000
Net profit:
₦800,000 − ₦480,000 − ₦200,000 = ₦120,000
Net profit margin:
₦120,000 ÷ ₦800,000 × 100 = 15%
So although the business had a 40% gross profit margin, its net profit margin was 15%.
Both numbers tell you something different.
Why Should You Track Both?
Gross profit margin helps you understand your products or core service.
If your gross margin is falling, your product costs may have increased, your selling prices may not have kept up, or your product mix may have changed.
Net profit margin shows what happens after the broader cost of running the business is considered.
This can help you identify whether expenses such as rent, salaries, transportation, marketing, utilities or other operating costs are consuming too much of your gross profit.
So don't ask only:
“How much did I sell?”
Also ask:
“How much did I keep?”
Profit Margin vs Markup
This is one of the most common areas of confusion.
Markup is calculated based on your cost.
Profit margin is calculated based on your selling price.
Suppose you buy a product for ₦10,000 and sell it for ₦15,000.
Your profit is:
₦15,000 − ₦10,000 = ₦5,000
Your markup is:
₦5,000 ÷ ₦10,000 × 100 = 50%
But your profit margin is:
₦5,000 ÷ ₦15,000 × 100 = 33.33%
So:
50% markup does not mean 50% profit margin.
This distinction matters when pricing products.
A Realistic Nigerian Business Example
Let's say Chidinma sells beauty products.
In one month she records:
Sales: ₦1,500,000
Cost of products sold: ₦900,000
Transportation: ₦70,000
Packaging: ₦30,000
Electricity: ₦40,000
Marketing: ₦60,000
Other expenses: ₦50,000
First:
₦1,500,000 − ₦900,000 = ₦600,000 gross profit
Now add the other expenses:
₦70,000 + ₦30,000 + ₦40,000 + ₦60,000 + ₦50,000 = ₦250,000
Net profit:
₦600,000 − ₦250,000 = ₦350,000
Net profit margin:
₦350,000 ÷ ₦1,500,000 × 100 = 23.33%
Now Chidinma knows something much more useful than simply knowing she made ₦1.5 million in sales.
She knows that approximately 23.33% of her revenue remained as net profit based on the figures recorded.
What If Your Profit Margin Is Low?
A low margin does not automatically mean the business is bad.
Different industries and business models have different economics, and even within the same industry, businesses can have different cost structures.
Instead, investigate why the margin is low.
Ask:
Are my products too expensive to acquire?
Am I selling at the right price?
Are discounts reducing my margin?
Are transportation costs increasing?
Are operating expenses too high?
Are some products profitable while others are barely making money?
Am I calculating the cost of my products correctly?
The purpose of calculating margin is not simply to produce a percentage.
It is to understand what is happening inside the business.
How to Improve Your Profit Margin
Once you know your margin, you can investigate the areas affecting it.
Review your pricing
If your costs have increased but your selling price has remained unchanged, your margin may have fallen.
Know the cost of every product
Do not assume that a product is profitable simply because you sell it above the purchase price.
Include relevant costs associated with getting and selling the product.
Control unnecessary expenses
Small expenses can become significant when they occur repeatedly.
Track them instead of relying on memory.
Identify your most profitable products
A product that sells frequently is not automatically your most profitable product.
Compare both sales volume and margin.
Watch discounts
A discount can increase sales while reducing the amount you make from each transaction.
Calculate the numbers before deciding that more sales automatically means more profit.
What Numbers Should You Record?
To calculate meaningful profit margins, you need reliable records.
At minimum, track:
Total sales
Cost of goods sold
Operating expenses
Discounts
Returns/refunds
Other business costs
Profit
If your records are incomplete, your margin calculation may also be inaccurate.
This is why financial visibility starts with recording transactions consistently.
A Simple Monthly Calculation
At the end of every month, you can create a simple calculation:
Revenue: ₦________
Cost of goods sold: ₦________
Gross profit: ₦________
Operating expenses: ₦________
Net profit: ₦________
Then:
Gross Profit Margin = Gross Profit ÷ Revenue × 100
Net Profit Margin = Net Profit ÷ Revenue × 100
Do this consistently and you will begin to see whether your margins are improving, falling or staying relatively stable.
The Impact
Knowing your profit margin changes the questions you ask about your business.
Instead of:
“How much did we sell this month?”
You can ask:
“How much did we make from those sales?”
Instead of:
“This product sells very fast.”
You can ask:
“How much profit does this product actually contribute?”
Instead of:
“Business is moving.”
You can look at the numbers and determine what is actually happening.
That is the difference between simply being busy and understanding your business financially.
Practical Solutions
If you have never calculated your profit margin before, start with your most recent complete month.
Add all your sales.
Calculate the cost of the products or services sold.
Calculate your gross profit.
Record your operating expenses.
Calculate your net profit.
Divide your profit by your revenue.
Multiply by 100.
Record the result.
Repeat the calculation every month.
Compare the results over time.
Do not wait until your business becomes large before doing this.
The earlier you understand your numbers, the easier it becomes to identify where money is being made and where it is being consumed.
A Question for You
If your business made ₦1,000,000 in sales last month, could you tell me exactly what percentage of that ₦1,000,000 was actual profit?
If you cannot, that may be the next number your business needs to start tracking.
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