Practical guide
How to Calculate Break-even Point
Find break-even units and revenue using fixed costs and contribution margin.
Quick Answer
Step-by-Step Method
- Separate costs into fixed (rent, salaries, insurance — unchanged by volume) and variable (materials, shipping, per-unit fees).
- Calculate contribution margin per unit: selling price minus variable cost per unit.
- Divide total fixed costs by contribution margin per unit to get the number of units needed to break even.
- Multiply that unit count by price to get break-even revenue, or divide fixed costs by the contribution margin ratio for the same answer.
Worked Example
Fixed costs are $48,000 a year. Each unit sells for $80 and costs $50 in materials and shipping. Contribution margin = $80 − $50 = $30. Break-even = 48,000 ÷ 30 = 1,600 units. At $80 each, that is $128,000 in revenue. Cross-checking with the ratio method: contribution margin ratio = 30 ÷ 80 = 0.375, and 48,000 ÷ 0.375 = $128,000.
Detailed Explanation
The classification step decides the answer, and it is less obvious than it looks. Some costs are genuinely mixed — a delivery van has a fixed lease and variable fuel; a salesperson may draw a base salary plus commission. Splitting these properly matters, because misfiling a variable cost as fixed inflates the break-even point and can talk you out of a viable product.
Break-even analysis is most valuable as a sensitivity tool rather than a single number. Because contribution margin sits in the denominator, small price changes move the break-even point sharply. In the example above, raising price from $80 to $88 lifts contribution margin to $38 and drops break-even from 1,600 to 1,264 units — a 21% reduction in the volume you need, from a 10% price rise. That asymmetry is why pricing usually beats cost-cutting.
The model assumes constant price and constant variable cost across all volumes, which reality rarely honours. Bulk discounts lower variable costs at higher volume; volume discounts to customers lower the effective price. Fixed costs also step rather than hold flat — at some point you need a second machine or a bigger unit. Treat break-even as valid within a stated volume range, and recalculate when you leave it.
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Run your real values in the interactive tool and review assumptions before taking action.
Open related calculatorFAQ
What is contribution margin?
The amount each unit sold contributes toward covering fixed costs, calculated as selling price minus variable cost per unit. Once fixed costs are fully covered, every further unit's contribution margin becomes profit.
How does break-even change if I cut prices?
Lowering price shrinks contribution margin, which raises the break-even volume — often steeply. Before discounting, check whether the extra volume you would need is realistically achievable.
Should I include my own salary in fixed costs?
Yes, if you need to draw an income from the business. Excluding owner compensation produces a break-even point that looks achievable but leaves you working unpaid.