Operating profit margin formula: How to calculate and use it for your small business

Published Thursday 2 July 2026

Table of contents

• What is operating profit margin?
• Operating profit margin formula
• How to calculate operating margin
• Why operating margin matters
• How you can improve operating margin
• Common mistakes when calculating operating margin
• Operating margin vs gross margin vs net margin
• Track and report operating margin in Xero
• FAQs on operating profit margin

Key takeaways

• Operating profit margin is written as a percentage and shows you how much money your business has left after covering all day-to-day costs, including things like payroll, inventory, and utility bills.
• You need to know your gross profit, operating expenses, and revenue to calculate your operating profit margin.
• Operating profit margin is a vital indicator of your business's efficiency, so it's worth calculating it regularly to see if your costs are balanced with your income.
• Other profit margins you can use include gross profit margin, which tells you the cost efficiency of your products or services, and net profit margin, which tells you how much is left over once every single business cost is taken into account.

What is operating profit margin?

Operating profit margin is the percentage of revenue your business keeps as profit after deducting day-to-day operating costs, but before interest and tax. It tells you how efficiently your business turns revenue into profit from its core activities.

Operating profit is how much money you have left after all day-to-day business costs are deducted from your revenue. This includes things like staff wages, inventory, manufacturing, business premises, and utility bills. Your operating profit margin is usually written as a percentage and shows you how much money your business can generate from its usual operations, like selling products or providing services.

You might see operating margin referred to as EBIT, which stands for earnings before interest and taxes.

Operating profit margin formula

Working out your operating profit margin involves three formulas. Each one builds on the last, starting with gross profit and ending with the margin percentage.

The first formula calculates your gross profit:

Revenue - cost of goods sold (COGS) = gross profit

To calculate COGS, you add together all of the direct costs that go into your products or services. The calculation differs slightly depending on the type of business. It's worth speaking with an accountant or bookkeeper who can help you calculate it, or reading a guide to COGS to work it out yourself.

The second formula calculates your operating profit:

Gross profit - operating expenses = operating profit

Operating expenses include costs like rent, business rates, utility bills, and administrative salaries. Combining the gross profit calculation and the operating profit calculation means all business costs are factored into the equation.

There are two adjustments you may need to make:

• Depreciation: Over time, your business equipment loses value through general wear and tear. This needs to be subtracted from your profit; an accountant or bookkeeper can help you work out how much to deduct.
• Interest: If you've paid interest, this can be added back to your profit figure, because interest rates aren't something your business controls.

The final formula gives you the operating profit margin as a percentage:

Operating profit margin = (Operating profit / Revenue) x 100

How to calculate operating margin

Here's an example of an operating margin calculation, using all three formulas above. A business owner running a seaside cafe wants to work out their operating profit and operating margin for the month.

1. Calculate gross profit

Over the last 30 days, the cafe made £20,000 in revenue. The cost of goods and services, including hot drinks, baked goods, and staff salaries, is £7,000.

£20,000 revenue - £7,000 COGS = £13,000 gross profit

2. Calculate operating profit

The cafe's operating expenses, which include rent, business rates, and utility bills, are £8,000 for the month.

£13,000 gross profit - £8,000 operating expenses = £5,000 operating profit

3. Calculate the operating profit margin percentage

Now the business owner can express the result as a percentage.

£5,000 operating profit / £20,000 revenue = 0.25

Multiply 0.25 by 100 to get 25%. The cafe's operating profit margin is 25%.

Why operating margin matters

A strong operating margin shows that your business can make money from its day-to-day activities and still cover costs. With 5.7 million private sector businesses operating in the UK, competition is intense; if your cash is swallowed by COGS and operating expenses, you won't be able to sustain the business long-term.

The operating profit margin is a crucial indicator of your business efficiency: whether costs are in balance with revenue, how well you're able to control spending, and whether your prices reflect the work that goes into your goods and services.

Your operating margin is also important for external stakeholders, banks, and lenders, who need to see that you're running an efficient business before they decide to fund it.

Operating margins vary by industry. According to UK Office for National Statistics data, manufacturing had a profitability rate of 11.8% in 2025, while services held a 15.2% rate. Knowing where your sector typically falls helps you set realistic targets and spot potential problems early.

How you can improve operating margin

Improving your operating profit margin means focusing on costs and revenue. Some tactics you can try include:

• Encourage repeat purchases. Incentives such as discounts and rewards may encourage existing customers to buy again, increasing your revenue.
• Track your overheads closely. Make sure you're using your business premises efficiently; consider remote working or smaller locations if it's an option for your team.
• Reduce COGS. By cutting the cost of your products or services, you get to keep more of the profit when you sell.
• Develop your marketing strategy. Use a mix of digital and physical marketing, such as social media, website SEO, physical pop-up stores, or events to find new customers.
• Bundle products. Increase your average order size by bundling products together that are frequently bought by customers.
• Increase prices. If you haven't raised your prices for a while, it might be time to re-evaluate them and make sure you're charging your worth.

Common mistakes when calculating operating margin

Getting the operating margin formula right means avoiding a few common errors. Here are four mistakes to watch out for.

• Including interest or tax: Operating profit specifically excludes interest payments and tax. If you include either one, you'll end up with a figure closer to net profit and your operating margin will look lower than it actually is.
• Using gross revenue instead of net revenue: If your business offers refunds, returns, or discounts, make sure you subtract those from your total revenue before running the formula. Using the gross figure overstates the margin.
• Confusing operating profit with EBITDA: EBITDA stands for earnings before interest, taxes, depreciation, and amortisation. Unlike operating profit, EBITDA adds depreciation and amortisation back in, so the two figures aren't interchangeable.
• Forgetting to exclude one-off costs: Exceptional items like redundancy payments or legal settlements aren't regular operating costs. Including them skews the margin and makes it harder to compare across periods.

Operating margin vs gross margin vs net margin

There are several types of profit margin, each one showing something different about your business. Here are three definitions and what they mean for your profitability.

• Gross profit margin: Gross profit margin is the percentage of revenue remaining after deducting the direct cost of goods sold, before operating expenses. You calculate it by subtracting COGS from revenue, dividing by total revenue, and multiplying by 100. It tells you the cost efficiency of your products or services and can indicate whether you need to increase prices or control costs to make individual products more profitable.
• Operating profit margin: Operating profit margin is the percentage of revenue remaining after all operating costs, excluding interest and tax. You calculate it by deducting operating expenses from your gross profit, then dividing by total revenue and multiplying by 100. It tells you how efficient your business is in its day-to-day operations, covering not just product costs but staff and all the associated costs of running a business.
• Net profit margin: Net profit margin is the percentage of revenue remaining after all costs, including interest and tax. You calculate net profit margin by deducting total expenses from your total revenue, dividing by total revenue, and multiplying by 100. It's also referred to as your bottom line: what's left over when all costs are covered.

Track and report operating margin in Xero

Getting the hang of profitability margins can help you see your business finances more clearly. You don't need to run the calculations yourself; with Xero's accounting software, you can create profit and loss reports using your live business transactions and see gross profit, net profit, and operating profit at a glance. Xero generates financial reports and forecasts for you and can present them in clear dashboards for a snapshot of your business's performance.

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FAQs on operating profit margin

Here are answers to common questions about operating profit margin.

Is operating margin the same as EBIT?

Yes. Operating margin and EBIT (earnings before interest and taxes) refer to the same measure: the profit left after deducting operating costs from revenue, but before interest and tax are applied.

What is a good operating margin?

It depends on your industry. For example, UK manufacturing had a profitability rate of 11.8% in 2025, while services reached 15.2%. Researching your specific sector's average gives you the most useful benchmark.

How often should I calculate operating margin?

Monthly calculations let you spot trends and see how your finances change over time. Quarterly reviews are useful for comparing performance against seasonal patterns.

What's the difference between operating profit and operating margin?

Operating profit is a currency amount: the money left after deducting COGS and operating expenses from revenue. Operating margin expresses that same figure as a percentage of revenue, making it easier to compare performance across periods or against other businesses.