Break-even analysis answers the most important question in business: how much must I sell before I make a profit? This guide explains fixed versus variable costs, the contribution margin that drives everything, the formula, and how to use it to test whether a price change will actually work.
Break-even analysis answers one of the most important questions in business: how much do I need to sell before I start making a profit? Below the break-even point, you are losing money; above it, every sale contributes to profit. Knowing this number turns pricing and planning from guesswork into arithmetic.
You can model the numbers with our margin calculator and budget calculator.
Break-even rests on splitting your costs into two types, and getting this split right is the whole game.
Some costs sit in between, but sorting them as cleanly as possible into fixed and variable is the essential first step.
The contribution margin is what each sale contributes toward covering your fixed costs, after its own variable cost is paid.
Contribution margin per unit = Selling price − Variable cost per unit
If you sell an item for $50 and it costs you $30 in materials and fees, each sale contributes $20 toward your fixed costs. Once enough of those $20 contributions have stacked up to cover all your fixed costs, you have broken even.
Break-even units = Total fixed costs ÷ Contribution margin per unit
Suppose your fixed costs are $4,000 a month and each sale contributes $20. Your break-even point is $4,000 ÷ $20 = 200 units a month. Sell 200 and you cover your costs exactly; sell 250 and the extra 50 units contribute $1,000 of profit. Suddenly your sales target has a precise, meaningful number behind it.
Break-even analysis is powerful for testing decisions before you make them. Lowering your price reduces the contribution margin, which raises the number of units you must sell to break even — sometimes dramatically. Raising the price does the opposite. Running the numbers shows you whether a planned discount will actually work or quietly push break-even out of reach.
Break-even helps with more than pricing. It tells you whether a new fixed cost — hiring someone, taking a bigger premises — is justified by the extra sales it would require. It sets a realistic sales target for a new product. And it is often the first thing a lender or investor wants to see, because it shows you understand the economics of your own business. Estimate financing costs alongside it with our business loan calculator.
Break-even is a simplification. It assumes your price and costs stay steady, which they may not, and it ignores the timing of cash flow — you can be above break-even on paper but short of cash if customers pay slowly. Treat it as a clear, powerful starting point for decisions, not a complete financial model, and pair it with a proper cash-flow view.
How do I calculate my break-even point?
Divide your total fixed costs by the contribution margin per unit (selling price minus variable cost per unit). If fixed costs are $4,000 a month and each sale contributes $20, break-even is 200 units a month.
What is the difference between fixed and variable costs?
Fixed costs stay the same regardless of sales — rent, insurance, salaries, subscriptions. Variable costs rise and fall with sales — materials, packaging, payment fees. Splitting your costs cleanly into these two types is the essential first step.
What is contribution margin?
It is what each sale contributes toward covering fixed costs after its own variable cost is paid — selling price minus variable cost per unit. If you sell for $50 and it costs $30 to produce, each sale contributes $20 toward fixed costs.
How does price affect break-even?
Lowering your price reduces the contribution margin, so you must sell more units to break even — sometimes far more if your margin is thin. Raising the price does the opposite. Always recalculate break-even before discounting.
What are the limits of break-even analysis?
It assumes price and costs stay steady and ignores the timing of cash flow — you can be above break-even on paper but short of cash if customers pay slowly. Treat it as a powerful starting point, not a complete financial model.