6 Numbers Every Business Owner Should Know Cold
Kimberly Green | 2026-04-08
By Sam's List | samslist.com
You don't need to understand all of accounting to run a great business. But there are six numbers that should live in your head at all times—because they tell you, quickly and clearly, whether your business is healthy or headed toward a problem.
Most business owners know their revenue. Fewer know their margins. Almost none can quote their cash conversion cycle or their break-even revenue off the top of their head. That gap between knowing you made money and knowing why your business is working is where the most expensive decisions happen.
Number 1: Gross Margin Percentage
Gross margin is the percentage of revenue left after paying the direct costs of producing your product or service.
Formula: (Revenue − Cost of Goods Sold) / Revenue × 100
Example: $1M in revenue, $400K in COGS. Gross margin = 60%.
Gross margin is the ceiling on your profitability. Every operating expense—salaries, rent, software, marketing—has to come out of your gross margin. If your gross margin is 30% and your operating expenses are 35% of revenue, you're losing money regardless of how much you grow.
Compare your gross margin to your prior months and to industry benchmarks. A declining gross margin means your costs are rising faster than your prices, or your revenue mix is shifting toward lower-margin products. Either requires a response.
If you can't quote your gross margin percentage right now, it's the first number to find.
Number 2: Monthly Recurring Revenue (or Monthly Revenue Run Rate)
For subscription and recurring-revenue businesses: Monthly Recurring Revenue (MRR) is the predictable revenue your business generates each month from active subscriptions or retainer clients.
For project-based or variable-revenue businesses: Monthly Revenue Run Rate is your trailing 3-month average revenue, annualized. (Take the last 3 months of revenue, divide by 3, multiply by 12.)
Knowing your run rate tells you where the business is trending, not just where it was. A business with $100K in revenue last month but a declining run rate is in a different position than one with the same monthly number and an accelerating trend.
For businesses with recurring revenue, tracking MRR growth rate month over month is one of the most important leading indicators of business health. A 5% monthly MRR growth rate compounds to 80% annual growth. A 2% monthly decline compounds to 22% annual decline.
Number 3: Net Profit Margin
Net profit margin is the percentage of revenue left after all costs—COGS, operating expenses, interest, and taxes.
Formula: Net Income / Revenue × 100
Example: $1M in revenue, $850K in total costs. Net income = $150K. Net profit margin = 15%.
Net margin tells you whether the business is actually profitable in a way that's sustainable. Revenue growth with shrinking net margins is often a sign of a business that's growing its way into a structural problem—adding costs faster than it's adding profit.
Industry benchmarks vary significantly. SaaS businesses often target 20–30% net margins at scale. Service businesses typically run 10–20%. eCommerce often runs 3–8%. Knowing your benchmark helps you evaluate whether your current margin is healthy or requires action.
Number 4: Cash Runway
Cash runway is how many months your business can operate at its current burn rate before running out of cash.
Formula: Current Cash Balance / Monthly Net Cash Burn
Example: $300K in the bank, $50K average monthly net cash outflow. Cash runway = 6 months.
Cash runway is the most important number for any business that isn't yet consistently cash flow positive. It tells you how much time you have to make your business work, raise more capital, or reduce burn before you run out of options.
Even for cash flow positive businesses, tracking runway is useful as a stress test. What's your runway if your largest client cancels? If revenue drops 20%? Running the scenario tells you whether you have a cushion or are operating without a margin for error.
The convention in startups is to maintain 12–18 months of runway at all times. For bootstrapped businesses, even 3–6 months of operating cash reserve materially reduces the risk that a bad quarter becomes a crisis.
Number 5: Customer Acquisition Cost (CAC) and Lifetime Value (LTV)
These two numbers are often discussed together because their relationship is what determines whether your business model is fundamentally sound.
Customer Acquisition Cost: How much does it cost, on average, to acquire a new customer? Include all sales and marketing spend—advertising, sales team costs, tools—divided by the number of new customers acquired in the same period.
Lifetime Value: How much revenue does a customer generate over the full course of their relationship with you? For subscription businesses, this is average monthly revenue per customer multiplied by average customer lifespan in months.
The ratio that matters: LTV:CAC. A ratio of 3:1 is generally considered healthy—you earn three dollars in lifetime value for every dollar spent acquiring the customer. Below 1:1 means you're losing money on every customer you acquire. Above 5:1 may indicate you're underinvesting in growth.
Not every business has clean LTV data, especially early-stage ones. But even a rough estimate of these numbers tells you whether the unit economics of your business model are fundamentally viable.
Number 6: Break-Even Revenue
Break-even revenue is the amount of revenue your business needs to generate to cover all costs with no profit and no loss.
Formula: Fixed Costs / Gross Margin Percentage
Example: $300K in annual fixed costs, 60% gross margin. Break-even revenue = $500K.
Knowing your break-even tells you exactly how much revenue you need before you're operating in positive territory. Every dollar of revenue above break-even contributes to profit at your gross margin rate. Every dollar below means you're losing money.
It also tells you how sensitive your business is to a revenue decline. If your break-even is $490K and you're doing $500K in revenue, a 2% decline tips you into loss territory. If your break-even is $300K and you're doing $500K, you have significant cushion.
Fixed cost structure matters enormously for resilience. A business with high fixed costs and low gross margin needs to be consistently at high revenue to be profitable. A business with low fixed costs and high gross margin can survive significant revenue volatility.
How to Start Tracking These If You Don't Already
If you can't answer all six of these questions right now, here's the fastest path to being able to:
- Clean up the books: All six numbers come from your financial records. If your books aren't current and accurate, the numbers aren't reliable. Start there.
- Ask your bookkeeper or CPA for the numbers: A good financial professional should be able to produce these on demand. If they can't, that's a gap in either the books or the relationship.
- Build a simple KPI dashboard: Even a basic spreadsheet that tracks these six numbers monthly, with trend lines, gives you the visibility to manage by them.
- Review monthly: Numbers that don't get reviewed don't get acted on. Build 20 minutes into your monthly routine to look at these six metrics and ask what changed.
What These Numbers Tell You
The goal isn't financial sophistication for its own sake. It's operational clarity—the ability to look at six numbers and know, in under two minutes, whether your business is healthy, trending the right direction, and built on solid unit economics.
That clarity is what good financial management produces. It's also what every founder deserves from their financial partner.
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