Work out how many units you need to sell to cover your costs, and how much revenue that represents. Break-even is the single most useful number in early business planning, because everything below it is a loss regardless of how good the revenue looks.
How break-even works
Every unit you sell contributes something toward your fixed costs. That contribution is the price minus the variable cost of producing that one unit. Divide your fixed costs by the contribution per unit, and you have the number of units that covers everything.
Fixed costs stay the same whether you sell nothing or a thousand units: rent, salaries, software subscriptions, insurance. Variable costs scale with each sale: materials, packaging, shipping, payment processing.
Sorting your costs into those two buckets correctly is most of the work. A common error is treating advertising as fixed. If you spend more on ads to sell more units, it behaves as a variable cost and belongs in the per-unit figure.
Margin of safety
This is the figure worth watching once you are profitable. It tells you how far sales could fall before you drop back into a loss.
A business breaking even at 100 units and selling 105 is technically profitable and extremely fragile. One slow month wipes it out. A business breaking even at 100 and selling 200 has room to absorb a bad quarter. Same profitability label, completely different risk.
The two ways to lower break-even
- Raise contribution per unit. Increase price or reduce unit cost. This has a leveraged effect, because it changes the denominator.
- Cut fixed costs. Direct and immediate, but there is a floor below which the business cannot operate.
Price increases are usually the fastest lever and the most resisted. Raising price by ten percent on a product with a forty percent contribution margin lowers your break-even volume by roughly a fifth.
If you are also running paid acquisition, the ROAS simulator shows whether your ad spend clears its own break-even, which is a separate test from this one.