How the break-even point is calculated
Each unit sold contributes its price minus its variable cost toward covering fixed costs; once enough units have been sold to cover all fixed costs, the business breaks even.
- Fixed costs — costs that don't change with volume (rent, salaries, etc.)
- Price — selling price per unit
- Variable cost — cost per unit that scales with volume (materials, packaging, etc.)
More detail
Price minus variable cost is the real lever
The gap between price and variable cost — the contribution margin — is what actually pays down fixed costs. What moves the break-even point is the absolute size of that gap, not the percentage change in either number. With the default figures (fixed 1,000,000 / price 5,000 / variable 3,000, break-even 500 units), raising the price by 500 and cutting the variable cost by 500 both widen the margin to 2,500 and land on the same 400 units. Doubling the price does not halve the break-even quantity — it widens the margin to 7,000 and drops it to 143 units, while halving the variable cost widens it to 3,500 and gives 286. Equal percentage moves on the two inputs are not equivalent, because only one of them sits on both sides of the subtraction.
Quick check. If price equals variable cost, no volume can ever break even — every unit sold contributes nothing toward fixed costs. This calculator returns a fallback in that case, so a missing result is a sign to check the price and variable cost inputs.
Frequently asked questions
What happens if my price is close to my variable cost?
A thin contribution margin means a very high break-even volume — with fixed costs of 1,000,000 and only a 200 margin per unit, you'd need 5,000 units (a 3,200 price against variable costs of 3,000). Even a small price increase can cut that number sharply, since it directly widens the contribution margin.
Does break-even revenue mean I've made a profit?
No — break-even revenue is the point where total revenue exactly equals total costs (fixed plus variable), so profit is zero. Every unit sold beyond the break-even quantity contributes its full margin (price minus variable cost) as profit.
Should overhead or one-time costs go into fixed costs?
Recurring costs that don't scale with sales volume — rent, salaries, insurance, loan payments — belong in fixed costs. One-time costs like initial equipment purchases are usually tracked separately as an investment, not folded into the ongoing break-even calculation.