What Is Break-Even Analysis?
Break-even analysis tells you exactly how many units you need to sell — or how much revenue you need to generate — before your business stops losing money. Below the break-even point, every sale reduces your loss. Above it, every sale adds to your profit.
The formula is simple: Break-Even Units = Fixed Costs ÷ Contribution Margin per Unit, where contribution margin is the selling price minus the variable cost per unit.
Fixed vs. Variable Costs
The distinction between fixed and variable costs is the foundation of break-even analysis:
- Fixed costs stay constant regardless of how much you sell — rent, salaried employees, insurance, software subscriptions, loan payments. You pay these whether you sell zero units or a thousand.
- Variable costs scale directly with output — raw materials, hourly labor, packaging, shipping, payment processing fees. Each unit you produce or sell adds to this total.
Some costs are semi-variable (like a part-time employee who works more when you're busy). For simplicity, classify these as either fixed or variable based on their dominant behavior.
Contribution Margin
The contribution margin is what's left from each sale after covering variable costs. It's the amount each unit "contributes" toward covering fixed costs — and eventually toward profit.
If you sell a product for $50 and the variable cost is $20, your contribution margin is $30. That means every unit sold moves you $30 closer to covering your fixed costs. Once fixed costs are fully covered, that $30 becomes profit.
The contribution margin ratio expresses this as a percentage of revenue. A 60% ratio means 60 cents of every dollar in revenue is available to cover fixed costs and profit.
Margin of Safety
Once you know your break-even point, the margin of safety tells you how far sales can fall before you start losing money. If you're currently selling 500 units and your break-even is 333 units, your margin of safety is 167 units — or about 33% of current sales. The larger the margin, the more cushion you have against a slowdown.
Frequently Asked Questions
How do I use break-even for pricing decisions?
Work backwards from a realistic sales volume. If you can reasonably sell 500 units per month, your price needs to generate enough contribution margin to cover fixed costs at that volume. Raise the price and the break-even point drops (fewer units needed). Lower the price and it rises.
What if I sell multiple products?
Use a weighted average contribution margin based on your expected sales mix. For example, if 60% of sales come from a $30 CM product and 40% from a $10 CM product, your blended CM is $22. Divide fixed costs by $22 to get your break-even in total units.
Does break-even include taxes or owner pay?
Only if you include them as costs. Owner salary should be included as a fixed cost if you want an accurate picture. Taxes on profit come after the break-even point, so they don't affect where you break even — but they do affect how much of the profit above break-even you actually keep.