Sample frameDay 037·Finance · Risk

Good morning. Every bet has a number where it stops losing money. Most operators have never written theirs down.

Finance.

Break-Even

5 min read·Apply by lunch

The question

What is the biggest bet currently running in your business — the recent hire, the new product, the lease — and if you cannot name the exact volume at which it stops costing you money, why haven't you spent the twenty minutes it takes to find out?

The idea

The break-even chart owes its name to Walter Rautenstrauch, the Columbia University industrial engineer who coined the term in the 1930s to answer a factory owner's question: at what volume does this operation stop losing money? The mechanics are simple — divide the fixed costs a decision adds by the contribution each unit earns, price minus true variable cost — and the answer is the volume at which the bet pays for itself. The trap is treating it as accounting: a figure calculated once for a business plan and never consulted again. Used properly it is a decision tool, run before every hire, launch or lease, because every fixed cost you add raises the ledge you must climb to, and every point of contribution you give away raises it further. Most operators can quote last month's revenue to the dollar; far fewer can name the volume at which their newest bet stops costing them money.

The framework

01
Start with contribution — what one sale actually earns.
Take your price and subtract the true variable cost of one more sale: materials, payment fees, shipping, the discount you actually give, the returns you actually take, the support time each customer consumes. What remains is contribution — the money each sale puts toward fixed costs. Be honest at this step, because every cost you flatter here understates the climb; a product that 'costs $40' but really costs $55 once fees and returns are counted can turn a viable bet into a slow leak.
02
Divide by the fixed costs the bet adds — not the company's overhead.
Break-even on a decision uses incremental fixed costs — the salary, rent, software and retainers this specific bet commits you to every month regardless of volume — divided by contribution per unit. Loading the whole company's overhead onto one product makes every idea look doomed; ignoring the costs a hire genuinely drags with it, from tools to employer charges to management time, makes every idea look safe. The discipline is to count exactly what this decision adds, and nothing else.
03
Stress the levers — price moves the number more than volume.
Once the number exists, stress it. Price is the strongest lever because a rise flows straight into contribution: on a 30% margin, a 10% price increase lifts contribution by a third and cuts the break-even volume by a quarter, while 10% more volume changes the unit economics not at all. Run price, cost and volume through the calculation before you commit — you will often find the bet is only survivable at a price you have been afraid to charge.
04
Convert units into months, and months into a verdict.
A break-even of 400 units a month means nothing until you set it against a realistic rate and get a date. If the bet reaches break-even in month seven and your cash covers five, you are not placing a bet — you are scheduling a crisis. Compare months-to-break-even against runway before committing, and write down in advance the checkpoint at which you will stop feeding a bet that is tracking behind; deciding that later means deciding it under sunk-cost pressure.

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