The four numbers every founder should know cold
Most founders can quote their revenue and almost nothing else. Four numbers tell you whether the business actually works — and most people can't name three of them.
Revenue is the number everyone knows and the one that lies most. You can grow revenue while quietly going broke — more sales at a loss, more customers you can't afford to serve, more cash frozen in a warehouse. The founders who build durable businesses don't watch revenue. They watch four numbers that, together, tell the truth.
I call them the commercial dashboard. Revenue is vanity; these are sanity.
1. Contribution margin
What's left from a sale after the true cost of delivering it — not just the cost of goods, but shipping, payment fees, fulfilment, returns. This is the real fuel in the tank. If you can't state it per product, you don't actually know which of your products are worth selling and which are quietly costing you money to ship.
2. CAC payback
How long it takes to earn back what you spent to acquire a customer. Under a few months, and you can pour fuel on the fire — every new customer funds the next. Over a year, and growth is just a slower way to run out of cash. Most founders never calculate this, which is why "we're growing" and "we're dying" can be the same sentence.
3. Lifetime value
What a customer is worth across the whole relationship, not the first order. If people rebuy, your first sale can break even and you still win handsomely over time. If they don't, every single sale has to stand on its own — a far harder business. Lifetime value is where the biggest hidden upside almost always lives.
4. Cash conversion
The gap between when you pay your costs and when you collect your revenue. This is where profitable businesses die — growing fast while their cash sits trapped in inventory or in invoices a client hasn't paid yet. You can be profitable on paper and insolvent in the bank in the same month.
Profitable businesses don't die of losses. They die of cash.
Why this matters more for experts
Nobody taught you these, so you fly on revenue and the feeling of being busy. But busy and profitable are different planets, and the only way to tell which one you're on is to look at the instruments instead of listening to the engine.
How to start, this week
- Calculate contribution margin per product. Rank them. Push the winners, fix or cut the losers.
- Estimate CAC and payback, even roughly. Anything that doesn't pay back quickly gets fixed or stopped.
- Measure your repeat rate and turn it into a lifetime-value figure. If it's low, that's your single biggest opportunity.
- Map your cash cycle and shorten it — deposits, faster terms, less stock sitting still.
A worked example
A founder proud of doubling her revenue sits down and runs the four numbers for the first time. Her bestselling product turns out to have her worst margin. Her customer acquisition takes fourteen months to repay. Half her cash is frozen in inventory sitting in a warehouse abroad. Same revenue she was celebrating last week — but now she can see exactly where the leaks are, and which of her "successes" was actually the problem.
Revenue tells you the business is moving. These four tell you whether it's moving toward wealth or toward a wall.