How to Calculate Break-Even Point
Break-even analysis shows how much you need to sell before revenue covers the costs included in your model. It is useful for pricing, product launches, budgeting, and sales planning because it connects fixed costs, variable costs, selling price, and volume in one calculation. This guide explains the break-even formula in units and revenue, with worked examples and practical cautions.
Last reviewed: 2026-08-30
Break-even point formula
For a product sold at a consistent price with a known variable cost per unit, calculate the contribution margin per unit first. Then divide fixed costs by that contribution margin.
- Contribution Margin per Unit = Selling Price − Variable Cost per Unit
- Break-Even Units = Fixed Costs ÷ Contribution Margin per Unit
The result is the number of units required for total contribution margin to cover fixed costs. You can run the calculation directly with the Break-Even Calculator.
Break-even example in units
Suppose a business sells a product for $50. Variable cost is $30 per unit, and monthly fixed costs are $12,000.
- Contribution Margin = $50 − $30 = $20 per unit
- Break-Even Units = $12,000 ÷ $20 = 600 units
The business must sell 600 units to cover the costs included in the model. At exactly 600 units, revenue is $30,000 and the model produces zero operating profit. Sales above that level begin contributing to profit, assuming price and cost assumptions remain unchanged.
How to calculate break-even revenue
When you want a revenue target instead of a unit target, use the contribution margin ratio. This is particularly useful when a business sells many products or when planning from aggregate sales figures.
- Contribution Margin Ratio = (Sales − Variable Costs) ÷ Sales
- Break-Even Revenue = Fixed Costs ÷ Contribution Margin Ratio
In the example above, the contribution margin ratio is 40% because $20 of each $50 sale contributes toward fixed costs and profit. Dividing $12,000 by 0.40 gives break-even revenue of $30,000.
What counts as a fixed cost?
Fixed costs generally do not change directly with the number of units sold within the relevant planning range. Examples may include rent, software subscriptions, insurance, and fixed salaries. The classification depends on the business and time horizon: a cost can behave as fixed for one decision and change at a larger scale.
Use costs that are relevant to the scenario you are evaluating. Leaving out material fixed expenses makes the break-even point look artificially low.
What counts as a variable cost?
Variable costs change with sales or production volume. Depending on the business, these may include product cost, packaging, transaction fees, sales commissions, fulfillment charges, or usage-based services.
The key question is whether an additional sale creates an additional cost. If it does, that cost may belong in the variable-cost assumption for the break-even model.
Contribution margin vs profit margin
Contribution margin and profit margin answer different questions. Contribution margin focuses on sales minus variable costs and shows how much is available to cover fixed costs and profit. Profit margin measures profit as a percentage of revenue after the costs included in that profit definition.
For a broader profitability calculation, use the Profit Margin Calculator and read the guide on how to calculate profit margin.
How price changes affect break-even volume
If variable cost stays constant, a higher selling price increases contribution margin per unit and lowers the number of units needed to break even. A lower price does the opposite. But a price change can also affect demand, discounts, channel fees, or product mix, so the mathematical result should be considered alongside realistic sales assumptions.
If you are setting a selling price from cost, the Markup Calculator can help, while the markup vs margin guide explains why those percentages are not interchangeable.
Break-even point with a target profit
Break-even itself means zero operating profit, but the same framework can estimate the volume required for a profit goal. Add the desired profit to fixed costs before dividing by contribution margin.
- Units for Target Profit = (Fixed Costs + Target Profit) ÷ Contribution Margin per Unit
Using the earlier example, a $6,000 monthly profit target would require ($12,000 + $6,000) ÷ $20 = 900 units, assuming the underlying costs and price remain constant.
Common break-even analysis mistakes
- Confusing revenue with contribution margin. Not every dollar of sales is available to cover fixed costs.
- Leaving out variable selling costs. Payment fees, commissions, or fulfillment expenses can materially change contribution margin.
- Using an average price that ignores product mix. Different products can have very different contribution margins.
- Assuming costs stay constant at every volume. Capacity limits, overtime, bulk discounts, and additional facilities can change the cost structure.
- Treating break-even as a cash-flow forecast. Timing of payments, inventory purchases, debt service, taxes, and capital spending may differ from the accounting assumptions in a basic break-even model.
How to use break-even analysis for decisions
Use break-even as a scenario tool rather than a single permanent number. Test a base case, a lower-sales case, and changes in price or variable cost. This helps reveal which assumptions have the greatest effect on the sales volume required to cover costs.
Recalculate when your rent, staffing, supplier costs, fees, pricing, or product mix changes. A current break-even estimate is more useful than a precise calculation built on outdated assumptions.