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Break-even analysis tells you how much you have to sell before a product or business stops losing money and starts making it. The break-even point is where total revenue equals total costs, so profit is exactly zero. You find it by dividing fixed costs by the contribution margin per unit, and the answer tells you the sales volume you must clear to cover everything.
For a CFO or founder, it is the fastest sanity check on a price, a product line, or a new hire: below break-even you are funding the business out of reserves, above it every additional sale drops contribution to the bottom line. This guide covers the formula, a worked example, and how to act on the number.
What is break-even analysis?
Break-even analysis is a calculation that finds the sales level at which total revenue covers total costs, leaving zero profit and zero loss. It separates costs into two buckets: fixed costs that do not change with volume (rent, salaries, insurance) and variable costs that rise with each unit sold (materials, shipping, transaction fees). The gap between price and variable cost per unit is the contribution margin, and it is what pays down fixed costs one sale at a time.
Break-even formula
| Measure | Formula |
|---|---|
| Contribution margin per unit | Price per unit minus variable cost per unit |
| Break-even point (units) | Fixed costs divided by contribution margin per unit |
| Break-even point (dollars) | Fixed costs divided by contribution margin ratio |
| Contribution margin ratio | Contribution margin per unit divided by price |
Worked example
A company sells a product for $50. Variable cost per unit is $30, so contribution margin is $20 and the contribution margin ratio is 40 percent. Fixed costs are $100,000 a year. Break-even in units is $100,000 divided by $20, which is 5,000 units. Break-even in dollars is $100,000 divided by 0.40, which is $250,000 in sales. Sell fewer than 5,000 units and the business loses money; sell more and each extra unit adds $20 of profit.
Break-even with a target profit
To find the volume needed for a specific profit, add the target profit to fixed costs before dividing. Using the same numbers, if the company wants $40,000 of profit, the calculation is ($100,000 plus $40,000) divided by $20, which is 7,000 units. This turns break-even analysis into a planning tool, not just a survival line, because it tells you exactly what volume backs up a profit goal.
Why break-even analysis matters
Break-even analysis answers questions a spreadsheet of last year's numbers cannot. Can we afford to drop the price to win the deal? How many units does a new salary have to generate before it pays for itself? What happens to our floor if a supplier raises variable costs 10 percent? Because it isolates fixed from variable costs, it shows how sensitive profit is to volume, and it flags when fixed costs have crept high enough that the business needs a lot of sales just to stand still.
What is a good break-even point?
There is no universal target, because break-even depends on your cost structure. A lower break-even point is generally safer: it means you cover costs on fewer sales and have more cushion if demand softens. Two levers move it. Raise the contribution margin (higher price or lower variable cost) and break-even falls. Cut fixed costs and it falls too. Businesses with high fixed costs and thin margins have high break-even points and are more exposed to a downturn, which is why controllers watch the number when overhead grows.
Limitations of break-even analysis
Break-even analysis assumes price and costs stay constant across all volumes, which rarely holds. Volume discounts lower variable cost at scale, and stepped fixed costs jump when you add a shift or a facility. It also assumes everything you make gets sold, ignoring inventory buildup. Treat the result as a clear-eyed baseline for a single set of assumptions, then rerun it whenever price, cost, or capacity changes. Pairing it with a rolling budget variance analysis keeps the assumptions honest against actual results.
Keeping the cost inputs accurate
Break-even is only as reliable as the fixed and variable costs you feed it, and most of those costs land as vendor bills and receipts. Miscoded overhead or costs captured in the wrong period will misstate your fixed base and skew the whole calculation. Capturing every operating cost cleanly, whether from a supplier invoice or a scanned receipt turned into structured data, gives you a cost base you can trust. Running those bills through accounts payable automation software keeps coding consistent, and tying the result to your working capital position shows not just when you break even but whether you have the cash to get there.
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