Profitability ratios: types, formulas and how to use

Published Tuesday 21 April 2026

Table of contents

• What do profitability ratios measure?
• Types of profitability ratios
• Understanding each profitability ratio
• Using profitability ratios in your business
• Track your profitability ratios with confidence
• FAQs on profitability ratios

Key takeaways

• Start by tracking your gross profit margin and net profit margin monthly, as these two ratios give you the clearest picture of how efficiently your business covers costs and generates profit at any sales volume.
• Protect your gross profit margin by maintaining consistent pricing, since discounting can quietly erode a significant portion of your total income before you notice the impact.
• Apply return on assets (ROA) and return on invested capital (ROIC) ratios as your business grows, using them to evaluate whether major purchases or investments are generating strong enough returns to justify the spending.
• Work with an accountant or bookkeeper to identify which profitability ratios are most relevant to your industry, as a good net profit margin varies widely — for example, 10% may be healthy in retail but low for a software business.

What do profitability ratios measure?

Profitability ratios are financial metrics that measure how efficiently your business converts spending into profits. They reveal which areas of your business generate the best returns.

Different ratio types focus on specific spending categories, and not every ratio will be relevant to your small business.

Types of profitability ratios

Profitability ratios fall into two main categories: margin ratios and return ratios. Each measures different aspects of your financial performance.

Margin ratios

Margin ratios measure your day-to-day operational efficiency. They show what percentage of revenue you keep after covering various costs.

Key margin ratios include:

• Gross profit margin: revenue remaining after direct costs
• Net profit margin: revenue remaining after all expenses

Return ratios

Return ratios measure how effectively you generate profits from major investments. These ratios are most relevant for growing businesses with significant assets or capital expenditure.

Key return ratios include:

• Return on assets (ROA): profit generated from total assets
• Return on invested capital (ROIC): profit generated from new investments

Understanding each profitability ratio

1. Gross profit margin

Gross profit margin shows what percentage of revenue remains after paying for the direct costs of your products or services.

This margin needs to be substantial because you'll use the remaining cash to cover operating expenses like rent, utilities, marketing, insurance and administration costs.

Maintaining consistent pricing helps protect your margin. A case study found discounting accounted for 9.4% of total income.

Why it matters

Higher gross margins give you important advantages:

• Greater cash retention: keeps more of each sale for operating expenses
• Improved sustainability: provides more runway to cover costs and generate profit
• Performance insights: serves as an early warning system for threats and opportunities

Here's how to calculate this ratio.

Formula for calculating gross profit margin ratio

Learn more in the guide How to measure profitability.

Get tips to improve these ratios in the guide How to increase profit.

2. Net profit margin

Net profit margin shows what percentage of revenue remains after paying all business expenses. This is your true profit from each sale.

A sample company analysis showed a net profit margin of 8.5%.

Why it matters

Higher net profit margins signal operational efficiency. They reduce your dependence on high sales volumes, which benefits small businesses without economies of scale.

Finding your optimal margin requires strategic balance. You can take several approaches:

• Lower prices: increase sales volume to boost total profits
• Maintain prices: invest extra revenue in marketing for customer acquisition
• Invest in staff: improve operations and customer experience

Here's how to calculate this ratio.

Formula for calculating net profit margin ratio

* Net profit can be quoted before or after taxes. If quoting after-tax net profit then you need to also subtract taxes.

Learn more in the guide How to measure profitability.

Get tips to improve these ratios in the guide How to increase profit.

3. Return on assets

Return on assets (ROA) measures how effectively you generate profit from your business assets like property, equipment and tools. This ratio is most relevant for businesses with significant investments in expensive equipment, real estate, or intellectual property.

Why it matters

ROA tests the wisdom and efficiency of your investments. A high ratio suggests you're getting good value from your assets. A low ratio may signal an opportunity to optimise your asset management or investment strategy.

One case study revealed 15% of destroyed stock occurred without supervision.

Here's how to calculate this ratio.

Formula for calculating return on assets ratio

* Use the value of assets rather than the average value of assets. Average values suit businesses that buy and sell assets all the time, which is less typical for small businesses.

4. Return on invested capital

Return on invested capital (ROIC) measures how efficiently a company generates after-tax operating profit from the capital invested in the business. This ratio is broadly used to evaluate how efficiently invested capital generates returns and is especially useful when comparing capital allocation across firms or projects.

Why it matters

ROIC reveals which assets or projects deliver strong returns. Use this insight to focus future investment on what works best and build on your successes.

Here's how to calculate this ratio.

Formula for calculating return on invested capital ratio

Using profitability ratios in your business

Profitability ratios help small businesses measure how efficiently they convert costs into profits. Track these metrics to maintain financial health and guide business decisions.

Start with these essential ratios:

• Gross profit margin: monitors operational efficiency
• Net profit margin: tracks overall profitability

Use your ratios to establish benchmarks and set improvement goals.

As your business expands, you may want to track additional metrics.

Advanced ratios for growing businesses

ROA and ROIC become more relevant as your business grows. Even without formal measurement, apply their core principle: investments must generate returns.

You don't have to do this alone.

Getting professional support

Work with accountants or bookkeepers to identify relevant ratios for your business. They can calculate these metrics and generate reports through Xero accounting software.

Track your profitability ratios with confidence

Understanding profitability ratios gives you powerful insights into your business performance. Start by monitoring your gross and net profit margins monthly to spot trends and opportunities.

With Xero accounting software, your profitability ratios are automatically calculated from your business data. You'll get clear reports that help you make informed decisions about pricing, costs and growth investments.

Get one month free and see how easy financial management can be.

FAQs on profitability ratios

Here are common questions small business owners ask about profitability ratios.

How often should you calculate profitability ratios?

Calculate your ratios monthly. This frequency helps you spot trends early and make timely adjustments to maintain strong performance.

What's considered a good profitability ratio for small businesses?

As a starting point, aim for gross margins above 50% and net margins above 10%. However, good ratios vary by industry. A 10% net profit margin may be good for retail but would be considered low for a Software as a Service (SaaS) company.

Which profitability ratio is most important to track?

A healthy gross margin gives you the foundation to sustain and grow your business at any sales volume. It directly impacts your ability to cover operating expenses and generate profit.

Please note the following important information.