The break-even point is the most important number most business owners never calculate. It's the exact moment where your total revenue equals your total costs — where you stop losing money and start making it. Everything before that point is burning cash. Everything after it is profit.
The formula itself is straightforward: Fixed Costs ÷ (Price Per Unit - Variable Cost Per Unit) = Break-Even Units. But the simplicity of the formula hides the power of actually knowing the number.
Fixed vs. Variable: Getting the Inputs Right
Fixed costs are expenses that don't change with sales volume: rent, salaries, insurance, software subscriptions, loan payments. You pay these whether you sell one unit or ten thousand. For most small businesses, fixed costs are between $3,000 and $15,000 per month. If you're not sure, add up your last three months of expenses that stayed constant regardless of revenue.
Variable costs change with each sale: materials, shipping, transaction fees, sales commissions, packaging. If you sell physical products, this is your cost of goods sold. If you sell services, it might be subcontractor costs or the hourly cost of delivery time. For digital products, variable costs can be near zero — which is why software businesses have such attractive unit economics.
The difference between your price and your variable cost is your contribution margin — the amount each sale contributes toward covering fixed costs. A $50 product with $20 in variable costs has a $30 contribution margin. You need enough $30 contributions to cover all your fixed costs.
What the Number Tells You
If your fixed costs are $10,000/month and your contribution margin is $30 per unit, you need to sell 334 units per month just to break even. That's about 11 per day. Is that realistic for your market, your marketing budget, and your capacity to fulfill orders? If the answer is no, you have three options: raise your price, lower your costs, or pick a different business.
This is why break-even analysis belongs before launch, not after. Too many entrepreneurs discover their break-even point is unreachable after they've already invested time and money. Five minutes of math up front can save months of struggle.
Price Sensitivity and Time to Break-Even
The most useful extension of break-even analysis is running multiple scenarios. What happens to your break-even point if you raise prices by 10%? What if your variable costs increase by $5 per unit? What if you add a new fixed expense like a warehouse lease? Small changes in inputs can dramatically shift the number of sales required.
Time to break-even is equally important. If you need 334 sales per month and you're currently getting 200, you'll hit break-even in month one... of never. But if you're growing at 15% per month, you might cross the line in month four. Knowing that timeline helps you plan your cash reserves and manage expectations.
Want to run these scenarios for your own business? Our free Break-Even Calculator shows you exactly how many sales you need, when you'll break even at different growth rates, and how changes in pricing or costs shift the math.