Before a business makes a single dollar of profit, it first has to claw back everything it spent to open the doors. The break-even point is the exact moment that happens — the level of sales where total revenue equals total cost, and the business stops losing money without yet making any.
Knowing that number turns pricing and planning from guesswork into arithmetic. It tells you how many units you must sell to survive, how much cushion a price increase buys you, and whether a new product can realistic- ally clear its own costs.
Fixed costs vs. variable costs
The whole calculation rests on splitting your costs in two:
- Fixed costs stay the same no matter how much you sell — rent, insurance, salaries, software subscriptions. You pay them even if you sell nothing.
- Variable costs rise with each unit — materials, packaging, payment-processing fees, shipping. Sell twice as much and they roughly double.
Contribution margin: the engine of break-even
Every unit you sell brings in its price but also incurs its variable cost. What’s left over is the contribution margin — the slice of each sale that goes toward covering fixed costs:
Contribution margin per unit = price − variable cost per unit.
Break-even is simply the number of those slices you need to fully pay off your fixed costs:
Break-even units = fixed costs ÷ contribution margin per unit.
A worked example
Say you run a small candle business:
- Fixed costs: $4,000 a month (studio rent, insurance, your baseline expenses).
- Price per candle: $25.
- Variable cost per candle: $10 (wax, wick, jar, label, shipping supplies).
The contribution margin is $25 − $10 = $15 per candle. So:
Break-even units = $4,000 ÷ $15 = 267 candles(266.7, rounded up — you can’t sell a fraction). Sell 267 in a month and you’ve covered everything; candle 268 is your first real profit, worth $15.
Break-even in revenue
Sometimes you want the answer in dollars rather than units — useful when you sell many different products. Multiply break-even units by price, or use the contribution-margin ratio:
- By units: 267 candles × $25 = $6,675 in sales.
- By ratio: the margin ratio is $15 ÷ $25 = 60%, so break-even revenue = $4,000 ÷ 0.60 = $6,667 (the small gap is the rounding of units).
The lever most owners overlook isn’t selling more — it’s widening the contribution margin. Trimming the variable cost by a dollar drops your break-even faster than almost anything else.
Using the number
- Add up your true monthly fixed costs and your per-unit variable cost.
- Subtract variable cost from price to get contribution margin, then divide fixed costs by it.
- Test scenarios: a higher price or lower variable cost both cut the units you need — see which is more realistic for your business.