Break-even analysis answers a question every owner should be able to state instantly: how much do I need to sell before I stop losing money? It separates costs into fixed and variable, then finds the sales volume where revenue exactly covers both. Below that point you operate at a loss; above it, each additional sale drops profit onto the bottom line. It is one of the most useful calculations in small business finance.
The core formula
Break-even in units equals fixed costs divided by the contribution margin per unit, where contribution margin is the selling price minus the variable cost of one unit. If fixed costs are 10,000 dollars a month and each sale contributes 25 dollars after variable costs, you break even at 400 units. To express it in revenue instead, divide fixed costs by the contribution margin ratio. The math is simple once you have clean cost figures.
Sorting fixed from variable costs
Fixed costs stay roughly the same regardless of volume, such as rent, insurance, salaried staff, and software subscriptions. Variable costs rise and fall with each unit sold, such as materials, shipping, and payment processing fees. Some costs are mixed, like a utility bill with a base charge plus usage, and you split those into their fixed and variable parts. Getting this sorting right is what makes the break-even number trustworthy.
Turning the number into decisions
A break-even figure tells you whether a price, a location, or a product line is realistic before you commit. If breaking even requires selling more units than your market could plausibly absorb, the plan needs a higher price, lower costs, or a different idea. You can also add a target profit to the fixed costs to find the sales level that hits a specific goal. This turns a break-even chart into a planning tool rather than just a safety check.
Watch the assumptions
Break-even is a snapshot built on today's prices and costs, so it drifts as either one changes. A supplier price increase raises variable cost and pushes the break-even point higher, meaning you must sell more just to stand still. Discounts do the same by shrinking the contribution margin on every unit. Recompute whenever a major input moves so the number stays honest.
A food truck has 6,000 dollars in monthly fixed costs. Each meal sells for 12 dollars with 5 dollars of variable cost, so the contribution margin is 7 dollars. Break-even is 6,000 divided by 7, about 857 meals a month, or roughly 29 a day.
Key takeaways
- Break-even units equal fixed costs divided by contribution margin per unit.
- Contribution margin is the selling price minus the variable cost of one unit.
- Add a target profit to fixed costs to find the sales level that hits a goal.
- Recompute whenever prices, materials, or other key costs change.
Common mistakes
- Treating owner salary or loan payments as variable rather than fixed costs.
- Using an average price when a discount has quietly lowered contribution margin.
- Forgetting to recompute after a supplier raises the cost of materials.
FAQ
What is the difference between break-even units and break-even revenue?
Units divide fixed costs by contribution margin per unit; revenue divides fixed costs by the contribution margin ratio to get a dollar sales target.
Does break-even include my own pay?
It should. Include a reasonable owner salary in fixed costs so breaking even means the business can actually support you.