The break-even point is the sales volume where revenue exactly covers costs. Below it, every sale loses money. Above it, each additional unit sold contributes to actual profit. The formula is fast; what takes time is finding honest numbers to put into it.
By Jessica MartinezAsk a room full of business owners how many units they need to sell to stop losing money, and most will guess. The actual answer comes from one division problem, not a gut feeling, and it takes about thirty seconds once you have three numbers in hand.
Break-Even Units = Fixed Costs / Contribution Margin per Unit. Contribution Margin per Unit = Selling Price - Variable Cost per Unit. Break-Even Revenue = Fixed Costs / Contribution Margin Ratio, where Contribution Margin Ratio = Contribution Margin / Price. Variable costs include materials and direct labor; fixed costs include rent, insurance, and salaried staff who get paid whether you sell anything that month or not.
A business has $30,000 in monthly fixed costs: rent, salaries, insurance. Each unit sells for $50 and costs $20 in variable costs. Contribution margin per unit: $50 - $20 = $30. Break-even: $30,000 / $30 = 1,000 units per month. At unit 1,001, the business is profitable for the first time that month.
Contribution margin ratio: $30 / $50 = 60%. Break-even revenue: $30,000 / 0.60 = $50,000 per month. At exactly $50,000, the business covers all costs with zero profit. Zero is not a goal, but it is a useful reference point.
With multiple products carrying different margins, calculate the weighted average contribution margin ratio based on your actual sales mix. Divide total fixed costs by that weighted ratio to find break-even revenue. The tricky part: shifts in sales mix change the break-even point even when total revenue holds steady, which is why a product line that feels profitable can quietly drag down the whole business.
Break-even tells you the floor. To set a profit target instead, add the target amount to fixed costs: (Fixed Costs + Target Profit) / Contribution Margin per Unit. Cutting fixed costs lowers break-even directly. Raising prices raises contribution margin and reduces the unit count required. Both levers matter, and they are not equally painful to pull.
The Break-Even Calculator runs this exact formula on your fixed costs, price, and variable cost per unit.
Break-even units = Fixed Costs / (Selling Price - Variable Cost per Unit). For a product priced at $60 with $25 variable cost and $35,000 monthly fixed costs: $35,000 / ($60 - $25) = 1,000 units. For revenue: Break-even revenue = Fixed Costs / (Contribution Margin / Price).
The break-even point is where total revenue equals total costs: no profit, no loss. Below that volume the business loses money on every period it operates. Above it, each additional unit sold generates profit equal to the contribution margin. It is the minimum viable sales volume, which is a useful number to know before signing a lease.
Break-even units = Fixed Costs / Contribution Margin per Unit. Contribution margin is selling price minus variable cost per unit. With $20,000 in fixed costs and a $25 contribution margin, you need 800 units to break even. Selling 799 means you closed the month at a loss.
Break-even analysis finds the sales volume required to cover all costs. It helps set a pricing floor, test whether a new product can ever make money, and model what happens to profitability when costs rise or prices drop. Plotting it on a chart makes the profit zone visible and tends to surprise people who assumed they were further above it than they were.
Jessica Martinez spends most of her working hours turning income statements into sentences a non-accountant can use. She came to finance writing after several years underwriting small business loans, which is where she learned that a business plan and a break-even number are two very different documents.
