Profit Margin Calculator UK

What the Calculator Results Mean

The calculator shows several key figures that help you understand your business profitability.

Gross profit is your revenue minus your cost of goods sold. It shows how much you earn from sales before deducting operating expenses.

Gross profit margin is your gross profit divided by revenue, expressed as a percentage. It tells you how efficiently your business turns sales into profit before operating costs. A higher percentage means you retain more of each pound earned.

Net profit is the profit remaining after all business income and expenses have been recognised. It is calculated as gross profit minus operating expenses, interest, taxes, and any other costs.

Net profit margin is your net profit divided by revenue, expressed as a percentage. It tells you how much of every pound of revenue becomes profit after all costs. At the time of writing, according to recent published research, the average net profit margin for UK private non-financial businesses is approximately 9.3%.

Markup is the percentage added to your cost to determine your selling price. A common mistake is confusing markup with margin. If your cost is £100 and you want a 20% margin, your price must be £125, which is a 25% markup.

The calculator also shows the implied markup needed to achieve your target margin, helping you avoid under-pricing.

Gross Profit Margin Formula and Example

Gross profit margin is calculated by subtracting cost of goods sold from revenue, dividing by revenue, and multiplying by 100.

Formula: Gross Profit Margin = (Revenue - COGS) / Revenue × 100

For example, if your revenue is £50,000 and your COGS is £30,000, your gross profit is £20,000. Your gross profit margin is £20,000 / £50,000 × 100 = 40%. This means you retain 40p of every pound earned before paying operating expenses.

Cost of Goods Sold generally includes direct costs attributable to producing or supplying goods or services, depending on the nature of the business. This may include materials, direct labour, and shipping costs.

Healthy gross margins vary by industry. Illustrative averages suggest UK service businesses often achieve 50% to 70%, while retail grocery typically sits at 30% to 35%. Software businesses often have gross margins above 60% due to low direct costs.

Net Profit Margin Formula and Example

Net profit margin is calculated by subtracting all expenses from revenue, dividing by revenue, and multiplying by 100.

Formula: Net Profit Margin = (Revenue - Total Expenses) / Revenue × 100

Using the same example, if your revenue is £50,000, COGS is £30,000, and operating expenses are £15,000, your net profit is £5,000. Your net profit margin is £5,000 / £50,000 × 100 = 10%. This means you retain 10p of every pound earned after all costs.

Net profit margin benchmarks vary significantly by industry. Typical published ranges include 20% or above for software and SaaS, 15% to 30% for professional services, 5% to 10% for construction, and 2% to 5% for retail. Net profit margins are currently under pressure from rising energy and finance costs, so tracking your margin regularly helps you respond to these pressures early.

Markup vs Margin: The Key Difference

Markup and margin are often confused, but they mean different things. Understanding the difference is essential for correct pricing.

Margin is profit expressed as a percentage of the selling price. If you sell an item for £125 and it costs £100, your margin is £25 / £125 × 100 = 20%.

Markup is profit expressed as a percentage of the cost. Using the same figures, your markup is £25 / £100 × 100 = 25%.

The table below shows the implied markup needed to achieve different margin targets.

A common pricing mistake is using markup when you mean margin. If your direct cost is £1,000 and you apply a 20% markup, you price at £1,200, giving a margin of only 16.7%. To achieve a 20% margin, you must price at £1,250.

How Tax Affects Your Profit Margin

Your profit margin before tax is not the same as your post-tax profit. The tax you pay depends on your business structure and the applicable UK tax rules.

Sole traders pay Income Tax at 20% to 45% on profits above the personal allowance of £12,570, plus Class 4 National Insurance at 6% on profits between £12,570 and £50,270, and 2% above that.

Limited companies pay Corporation Tax at 19% on profits up to £50,000 and 25% on profits over £250,000, with marginal relief in between. You then pay dividend tax on what you take out of the company.

Whether incorporation is more tax-efficient depends on profit levels, remuneration strategy, available tax reliefs, ownership structure, administrative costs, and personal circumstances. There is no single profit threshold where incorporation becomes preferable. At the time of writing, a limited company may become more tax-efficient once profits comfortably exceed the higher-rate threshold, because you control when you draw profit. Below that, a sole trader is usually simpler and cheaper to run, but the actual decision depends on your specific situation.

When calculating your net profit margin, remember that tax is a layer that reduces your actual post-tax profit. A business with a strong margin but no plan for tax can still find itself short of cash at the filing deadline.

Our Self-Employed Tax Calculator can help you estimate your tax bill, and our Corporation Tax Calculator helps with company tax planning.

Common Mistakes When Calculating Margins

Several common mistakes can lead to incorrect margin calculations. Understanding these helps you avoid costly errors.

Confusing markup and margin. As explained above, using markup when you mean margin leads to under-pricing. Always calculate your margin based on the selling price, not the cost.

Excluding all direct costs from COGS. Your cost of goods sold should include materials, direct labour, and shipping. Missing any of these inflates your gross margin.

Including operating costs in COGS. Rent, marketing, and admin costs belong in operating expenses, not COGS. Including them in COGS understates your gross margin.

Mixing time periods. Your revenue and expenses must cover the same period. Using figures from different periods gives an inaccurate margin.

Not accounting for returns, discounts, and ad spend. These costs can quietly turn a healthy contribution margin into a thin or negative one. A 10% return rate can cut your profit by far more than 10%, because each return also carries the fees you already paid.

Not checking your totals. A missing £2,000 from £200,000 in sales changes your margin by 1%. Small errors in your figures can lead to significant misjudgements.