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Airlines watch one number more closely than almost any other: the share of seats they must fill before a flight stops losing money. The industry body IATA even publishes a break-even load factor every year. Every business has its own version of that number, and most owners know it less precisely than they think.
What break-even analysis is
Break-even analysis finds the sales volume at which total revenue equals total cost, so profit is exactly zero. Below it you lose money; above it every extra sale adds profit. It rests on one idea: each unit you sell earns a contribution margin, the selling price minus the variable cost of that unit, and those contributions first have to cover your fixed costs.
The two formulas
- Break-even in units = fixed costs ÷ (price per unit − variable cost per unit)
- Break-even in revenue = fixed costs ÷ contribution margin ratio, where the ratio is the contribution margin divided by the price
Fixed costs stay the same whatever you sell in the period: rent, salaries, software, insurance. Variable costs rise with each unit: materials, packaging, shipping, payment fees.
Break-even example, step by step
A company plans a new outdoor product line.
Fixed costs: €522,000 a year.
Price: €149 per unit.
Variable cost: €62 per unit.
Contribution margin: €149 − €62 = €87 per unit.
Break-even volume: €522,000 ÷ €87 = 6,000 units.
Break-even revenue: 6,000 × €149 = €894,000.
The plan is to sell 8,400 units. That gives a margin of safety of 2,400 units, or about 29% of planned volume, and a profit of 2,400 × €87 = €208,800.
Now test it. If a competitor forces the price down to €139, the margin falls to €77 and break-even rises to about 6,780 units. A €10 price cut needs 780 extra sales just to stand still. That kind of check is where break-even analysis earns its place.
One-page model visual
The one-page visual
Use this visual as a quick reference. The card in the deck adds the questions and the steps to run the model on your next real question.
How to run a break-even check in 30 minutes with the card
- Minutes 0 to 8: list fixed costs for the period. Use a year for a product line, a month for a shop. Include the owner's salary.
- Minutes 8 to 14: build the variable cost per unit. Materials, packaging, shipping, payment and platform fees, returns.
- Minutes 14 to 18: calculate. Contribution margin, break-even units, break-even revenue.
- Minutes 18 to 25: stress-test. Price 10% lower, variable cost 10% higher, fixed costs 10% higher. Which hurts most?
- Minutes 25 to 30: compare with reality. How many units did you sell last year, and how many can you physically deliver?
The card gives the formula, the steps and an example on one card, so you can do this at your desk with a calculator.
Common break-even mistakes
- Forgetting small variable costs. Payment fees, returns and free shipping can take several euros off each unit's margin.
- Using one average price. If a third of sales are discounted, use the real average, not the list price.
- Ignoring capacity. A break-even of 6,000 units means little if you can only make 5,000 a year.
- Treating stepped costs as fixed. A second warehouse or extra staff kicks in at a certain volume and moves the break-even point.
Break-even is the numbers side of a Business Model Canvas: it checks whether revenue streams can carry the cost structure. Lenders ask the same question when they assess capacity in the 5 Cs of Credit.
Break-even analysis FAQ
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What is the break-even formula?
Break-even units = fixed costs ÷ (price − variable cost per unit). For revenue, divide fixed costs by the contribution margin ratio.
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What is a good margin of safety?
It depends on how predictable your sales are. Many small businesses aim for at least 20 to 30% above break-even, so a bad quarter does not push them into a loss.
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What is the difference between break-even and cost-volume-profit analysis?
Break-even finds the zero-profit point. Cost-volume-profit analysis uses the same numbers to answer wider questions, such as the volume needed for a profit target or the effect of a price change.
Know your number before you set the price
The break-even card has the formula and the steps on one card, so the calculation takes minutes instead of a spreadsheet build. The Google Sheets template and the Model Dashboard let you move price, cost and volume and see the break-even point change, which makes pricing discussions much faster. It is one of 50 models in the MBA Tools deck.
