How to measure profitability: margins and formulas

Published Friday 6 November 2026

Table of contents

• What profitability means in small business
• Why measuring profitability matters for your business
• Key profitability metrics
• How to measure profitability
• Where to find the numbers you need
• Track profitability automatically with Xero
• FAQs on measuring profitability

Key takeaways

• Calculate your gross profit margin by subtracting cost of goods sold from revenue, then dividing by revenue and multiplying by 100.
• Track your net profit margin at least monthly, as it shows the share of revenue your business keeps after all costs.
• Use operating margin to check how efficiently you run day-to-day operations, and return on investment (ROI) to see whether a purchase pays for itself.
• Recognise that, as a rule of thumb, a 10% net profit margin is healthy and 20% is high, though benchmarks vary by industry.

What profitability means in small business

Profitability measures how effectively your business turns sales into profit, and it's a key indicator of health for the around 65.3% of small businesses in the US that were profitable in 2022. It shows what percentage of your revenue you keep after paying costs. Two core profitability ratios are gross profit margin and net profit margin.

Profitability levels signal different things about your business:

• High profitability (wide margins): you keep a large share of revenue as profit. This is generally positive, though it may suggest room to lower prices and boost sales volume.
• Low profitability (narrow margins): most of your revenue covers expenses. This could mean costs are too high, pricing is too low, or you're competing heavily on price.

Profit vs profitability and their significant differences

Profit and profitability sound alike, but they measure different things. Here's how they differ:

• Profit: the amount of money your business keeps after paying expenses
• Profitability: the percentage of revenue you retain versus the percentage spent on operations

Here's why this distinction is useful. High profitability only improves your bottom line when paired with strong revenue, so aim for both healthy margins and solid sales.

Why measuring profitability matters for your business

Measuring profitability regularly helps you make informed decisions about pricing and costs as you grow. When margins tighten, cash flow often suffers and stress increases. Spotting a squeeze early gives you time to adjust prices or trim costs before it hits your own pay.

Tracking your numbers helps you act before small problems become big ones. Profitability can shift due to factors like these:

• Rising costs: raw materials, energy, transport and packaging
• Market changes: interest rates and exchange rates
• Fixed expenses: rent and wages
• Customer demand: seasonal dips and changing buying habits

Measuring regularly ensures your margins give you the flexibility you need to run your business confidently.

Key profitability metrics

Four metrics show how much money your business keeps at each stage and whether your spending pays off. Gross, operating and net profit margin are all profitability ratios, while ROI measures the return on a specific purchase.

Gross profit margin

Gross profit margin is the percentage of revenue left after you pay the direct costs of delivering your product or service, known as cost of goods sold (COGS). Your gross profit then covers operating expenses like rent, utilities and marketing.

Formula: (Revenue − COGS) ÷ Revenue × 100 = Gross profit margin %

Example: a business with €100,000 in revenue and €60,000 in COGS has €40,000 in gross profit. €40,000 ÷ €100,000 × 100 gives a gross profit margin of 40%.

For industry benchmarks and ways to improve this figure, read more about what gross margin tells you.

Net profit margin

Net profit margin is the percentage of revenue left after you pay all business costs, including COGS and operating expenses. Net profit is what your business keeps, and it's typically reinvested in growth or paid to owners.

Formula: (Revenue − Total expenses) ÷ Revenue × 100 = Net profit margin %

Example: a business with €100,000 in revenue and €80,000 in total expenses has €20,000 in net profit. €20,000 ÷ €100,000 × 100 gives a net profit margin of 20%.

Net profit can be quoted before or after tax; for an after-tax figure, subtract tax as well. This guide uses pre-tax net profit, and you can compare it with other types of profit margin.

Operating margin

Operating margin is the percentage of revenue left after you pay direct costs and operating expenses, but before interest and tax. It shows how efficiently you run day-to-day operations, separate from financing costs and tax obligations.

Formula: (Revenue − COGS − Operating expenses) ÷ Revenue × 100 = Operating margin %

Example: a business with €100,000 in revenue, €60,000 in COGS and €15,000 in operating expenses has €25,000 in operating profit. €25,000 ÷ €100,000 × 100 gives an operating margin of 25%.

The calculation isn't always standard. One review found that among companies reporting operating profit, there were at least nine different definitions in use. Some businesses also track operating profit after tax for a clearer view of what operations earn.

Return on investment (ROI)

ROI is the profit an investment brings in, shown as a percentage of what it cost. It helps you decide whether new equipment, a marketing campaign or another purchase is worth the money.

Formula: (Net profit from investment ÷ Cost of investment) × 100 = ROI %

Example: a bakery spends €8,000 on a new oven that brings in €3,000 of extra profit in year one. €3,000 ÷ €8,000 × 100 gives an ROI of 37.5%.

You can also use ROI to compare two possible purchases side by side. Find out more about calculating return on investment.

How to measure profitability

To measure profitability, divide your profit by revenue, then multiply by 100 to express it as a percentage. First, calculate your profit figure, which differs depending on whether you're measuring gross or net profit margin.

How to calculate gross profit margin

Follow these steps to calculate your gross profit margin:

1. Subtract your cost of goods sold (COGS) from your total revenue to get gross profit.
2. Divide gross profit by total revenue.
3. Multiply by 100 to convert to a percentage.

Formula: (Revenue − COGS) ÷ Revenue × 100 = Gross profit margin %

Try the Xero gross margin calculator for instant results.

How to calculate net profit margin

Follow these steps to calculate your net profit margin:

1. Subtract all expenses (COGS plus operating costs) from your total revenue to get net profit.
2. Divide net profit by total revenue.
3. Multiply by 100 to convert to a percentage.

Formula: (Revenue − Total expenses) ÷ Revenue × 100 = Net profit margin %

Try the Xero net profit margin calculator for instant results.

Example of measuring profitability

Here's how to calculate profitability for a business with €100,000 in sales, €60,000 in inventory costs, and €20,000 in general expenses:

• Gross profit: €100,000 − €60,000 = €40,000
• Gross profit margin: €40,000 ÷ €100,000 × 100 = 40%
• Net profit: €100,000 − €80,000 (total costs) = €20,000
• Net profit margin: €20,000 ÷ €100,000 × 100 = 20%

This business keeps 40% of revenue after direct costs and 20% after all expenses.

Where to find the numbers you need

Before you can calculate profitability, you need to gather the right figures from your financial records. Here's where to find each component:

• Revenue: pull this from your sales invoices or point-of-sale reports.
• Cost of goods sold (COGS): find this in inventory records, supplier invoices, or direct labour costs.
• Operating expenses: locate these in your general ledger under categories like rent, utilities, wages, and marketing.
• Total expenses: add COGS and operating expenses together.

Accounting software like Xero organises these figures automatically, so you can generate reports without manual calculations.

Track profitability automatically with Xero

Accounting software removes the manual work from tracking profitability. You can monitor your margins in real time without building spreadsheets.

Here's how you can simplify measuring profitability:

• Automatic calculations: get gross and net profit margins calculated for you.
• Real-time dashboards: view your margins anytime in Xero Analytics.
• Flexible reporting: generate profit and loss statements for any period.
• Up-to-date data: bank feeds and invoicing keep your numbers current.

Choose the plan that suits your business and get one month free.

FAQs on measuring profitability

Here are answers to common questions about measuring and interpreting profitability.

What's a good profit margin for a small business?

A healthy net profit margin depends on your industry, but a common rule of thumb from Brex is that a 5% margin is low, 10% is healthy, and 20% is high. Average margins vary widely by sector, as NYU Stern's US industry margin data shows, so compare your margin with similar businesses.

How often should I measure profitability?

Review your profitability monthly at a minimum, or weekly if your margins are tight or your sales are seasonal. Regular tracking helps you spot trends and act quickly.

What's the difference between profitability and cash flow?

Profitability measures how much revenue exceeds expenses over time, while cash flow tracks the actual money moving in and out of your accounts. A business can be profitable in its accounts but still face cash shortages, so forecasting your cash flow helps you plan ahead.

Which profitability metric is most important?

Net profit margin gives the clearest picture of overall business health since it accounts for all expenses. Gross profit margin helps you evaluate pricing and production efficiency.

Can my business be profitable but still run out of cash?

Yes, because profit is calculated over a period while cash flow depends on when money actually arrives and leaves. Late customer payments, large upfront costs, or the way you treat depreciation and principal payments on loans can leave a profitable business short on cash.