COMMERCIAL NUMBERS

10 Financial Ratios Every Small Business Owner Should Understand

MOOR & CO  ·  JUNE 2026  ·  7 MIN READ

Most business owners focus on winning customers, generating sales and building a brand. All of that matters. But businesses with strong sales still fail regularly, and almost always for the same reason: nobody was watching the numbers that actually determine profitability and survival.

You do not need an accounting degree to understand these. You need ten numbers, checked monthly, and the discipline to act when one of them moves in the wrong direction.

This article explains commercial ratios and what they mean for decision making. It is not accounting, tax or financial advice. Your accountant is the right person to calculate these figures precisely from your accounts.

The ten numbers

1. GROSS MARGIN PERCENTAGE
The most important ratio for any trading business
Gross Profit ÷ Sales × 100

If you sell £100,000 of product and your direct costs are £60,000, your gross profit is £40,000 and your gross margin is 40%. This tells you how much is left to cover wages, rent, marketing and everything else. Businesses with poor gross margins struggle regardless of how much they turn over.

2. MARK-UP PERCENTAGE
Not the same thing as margin
Gross Profit ÷ Cost × 100

If something costs £100 and sells for £150, the mark-up is 50%, but the margin is 33%. Confusing the two is one of the most common pricing mistakes in small business. Know which one you are using when you set a price.

3. NET PROFIT MARGIN
What actually determines sustainability
Net Profit ÷ Sales × 100

A business turning over £1 million but keeping only £50,000 has a net margin of 5%. Gross margin measures product profitability. Net margin measures whether the whole business actually works.

4. CURRENT RATIO
Short-term liquidity
Current Assets ÷ Current Liabilities

A ratio above 1.2 generally indicates reasonable financial health. Approaching 2.0 suggests a stronger position. This is the number that tells you whether you can pay your upcoming bills without a scramble.

5. DEBTOR DAYS
How long customers actually take to pay you
Trade Debtors ÷ Annual Sales × 365

Many profitable businesses run into trouble simply because customers pay slowly. The lower this figure, the better your cash flow. This one matters enough that we have written a separate guide on it.

6. CREDITOR DAYS
How long you take to pay suppliers
Trade Creditors ÷ Annual Purchases × 365

Managing supplier payment terms effectively can significantly improve cash flow without increasing borrowing. This is a commercial lever most small businesses leave completely unmanaged.

7. CASH CONVERSION CYCLE
How quickly cash actually moves through the business
Debtor Days + Stock Days − Creditor Days

A lower number is more efficient. Some highly successful companies achieve a negative cycle, meaning they get paid by customers before they pay suppliers. That is the commercial equivalent of free working capital.

8. STOCK TURNOVER
Cash sitting on shelves
Cost of Goods Sold ÷ Average Stock

Higher stock turnover generally means better efficiency and less working capital tied up in things that have not sold yet. Relevant for any business holding physical inventory.

9. OVERHEAD RATIO
Whether growth is actually profitable
Operating Expenses ÷ Sales × 100

Many businesses increase sales but fail to increase profit because overheads grow just as fast. Monitoring this ratio keeps growth honest. Bigger is not automatically better.

10. BREAK-EVEN POINT
The number every owner should know without a spreadsheet
Fixed Costs ÷ Gross Margin %

If annual fixed costs are £100,000 and gross margin is 40%, the business needs £250,000 in sales simply to break even. Everything above that contributes to profit. If you cannot answer this number for your own business immediately, it is worth finding out.

The additional one worth tracking

BONUS: GROSS PROFIT PER EMPLOYEE
Whether your team is creating value or just adding cost
Gross Profit ÷ Number of Employees

This metric quickly reveals whether additional headcount is genuinely creating value or simply increasing overhead. Many businesses grow turnover significantly while profit stagnates, because this number quietly deteriorates and nobody is watching it.

Building a simple monthly dashboard

You do not need a complicated reporting system. A simple monthly dashboard tracking these ten figures, plus gross profit per employee, gives any business owner a clear picture of profitability, cash flow and operational efficiency without becoming overwhelmed by financial reporting.

The most successful business owners are not always the best salespeople or the best marketers. They are often the ones who understand their numbers better than their competitors. What gets measured gets managed. For a small business, few disciplines pay off faster than measuring the right numbers from the start.

Want help building this dashboard for your business?

Moor & Co works with small businesses across Staffordshire and South Cheshire to build the commercial dashboards and reporting that make these numbers visible every month, not just at year end.

Download free PDF ↓  ·  Commercial Strategy services →
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