Revenue is the most-watched number in most small businesses. It is also the least informative on its own. A business can grow revenue every year and still fail — if margins are shrinking, cash is not being collected, or costs are growing faster than income.

KPIs — key performance indicators — are the numbers that tell you whether the business is actually working, not just whether it is busy.

The core financial KPIs

Gross profit margin

Gross profit margin = (Revenue − Cost of Goods Sold) ÷ Revenue. This measures how efficiently you deliver your product or service. A declining gross margin is a warning sign — it means your direct costs are rising faster than your prices. Watch this number monthly, not just annually.

Net profit margin

Net profit margin = Net Profit ÷ Revenue. This is the bottom line — what percentage of revenue actually becomes profit after all expenses. A business with a 5% net margin on $500,000 in revenue earns $25,000. A business with a 20% net margin on $200,000 earns $40,000. Margin matters more than volume.

Accounts receivable days outstanding (DSO)

DSO = (Accounts Receivable ÷ Revenue) × Number of Days. This measures how long it takes to collect what you are owed. A DSO of 30 means you collect payment in about 30 days on average. A DSO of 75 means cash is sitting in unpaid invoices for two and a half months. High DSO is a cash flow problem waiting to happen.

Cash runway

Cash runway = Current Cash Balance ÷ Monthly Cash Burn. How many months can the business operate at current spending if revenue stopped tomorrow? Most small businesses should maintain at least 2–3 months of cash runway. Less than that and a single slow month becomes a crisis.

Revenue growth rate

Month-over-month and year-over-year revenue growth. This tells you whether the business is expanding, flat, or contracting. Compare to the same period last year to account for seasonality.

Industry-specific KPIs that matter

Construction and contractors

• Job cost variance: Actual cost vs. estimated cost per project. A business can be profitable overall while losing money on individual jobs.
• Backlog: Total value of contracted but uncompleted work. Indicates future revenue visibility.

Restaurants

• Food cost percentage: Cost of food sold ÷ food revenue. Target varies by concept but typically 28–35%.
• Labor cost percentage: Total labor cost ÷ total revenue. Combined with food cost, this is "prime cost" — the most important metric in food service.

E-commerce

• Customer acquisition cost (CAC): Total marketing spend ÷ new customers acquired.
• Return rate: Percentage of orders returned. High return rates erode margins and create inventory complexity.
• Inventory turnover: How quickly inventory is sold and replaced.

Service businesses

• Utilization rate: Billable hours ÷ available hours. A consultant billing 60% of available hours has a utilization rate of 60%.
• Revenue per client: Tracks whether client relationships are growing or shrinking.

A realistic example

Common mistakes

• Tracking only revenue. Revenue without margin context is misleading.
• Not tracking receivables aging. Uncollected invoices are a silent cash drain.
• Using industry benchmarks as targets. Benchmarks are reference points, not goals. Your target depends on your cost structure and business model.
• Reviewing KPIs annually. Annual review is too slow. Monthly review catches problems while they are still correctable.

Practical next steps

• Identify the three KPIs most relevant to your business model and industry.
• Make sure your bookkeeping is current enough to calculate them accurately.
• Set a monthly review date and track trends over time — a single month's number means less than the direction of travel.
• If you do not know your gross margin or DSO, that is the first problem to solve.