How does the Break-Even Calculator work?
The calculator finds contribution margin per unit by subtracting variable cost per unit from selling price. Fixed costs are then divided by contribution margin per unit to estimate break-even units. The result rounds units up because a partial unit normally cannot be sold.
If your input costs are still being developed, use the Cost Per Unit Calculator first.
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For optional supporting equipment or reference material, you can browse Accounting ledger books (paid link) on Amazon.com. Keep a paper record of the figures you enter and their source dates. Check the records against actual statements rather than relying on an estimate alone. No purchase is required to use this calculator.
What are fixed and variable costs?
Fixed costs do not change directly with each additional unit in the modeled range, while variable costs increase with units sold or produced. The distinction can depend on the business and time period. A complete cost inventory is important before relying on the result.
The Gross Profit Calculator can help compare revenue and cost of goods sold after sales occur.
How should you interpret break-even units?
The break-even point is the modeled sales level where total contribution margin covers fixed costs, producing approximately zero operating profit before any costs omitted from the model. Selling above this level can create profit if assumptions hold; selling below it leaves fixed costs uncovered.
Use the Profit Margin Calculator to evaluate profitability once you have a revenue and cost scenario.
How can break-even analysis support planning?
Break-even analysis can help compare prices, cost reductions and sales targets. It is a scenario tool rather than a demand forecast. For investment-level performance after cash is committed, use the ROI Calculator.
Worked example: Break-Even
Enter the following values in the Break-Even Calculator and calculate to reproduce this result.
- Fixed costs: 15000
- Selling price per unit: 75
- Variable cost per unit: 45
Example result: 500 units. $15,000.00 of fixed costs with $30.00 contribution per unit requires about 500 units, rounded up to 500.
Calculation used: break-even units = fixed costs ÷ (price per unit − variable cost per unit)
How to interpret this example
The contribution per unit is selling price less variable cost. In this scenario, 15,000 ÷ 30 = 500 units. If you can sell only whole units, round the requirement upward; a price no greater than variable cost cannot cover positive fixed costs.
Frequently asked questions about Break-Even
It is the modeled sales level where contribution margin covers fixed costs and operating profit is approximately zero.
Break-even units equal fixed costs divided by selling price per unit minus variable cost per unit.
If price is not greater than variable cost, each additional unit does not contribute toward covering fixed costs.
A business generally must sell a whole additional unit to fully cover the modeled fixed costs.
Only if taxes are included in the cost assumptions. This simple model does not add taxes automatically.
Yes, as long as price, variable cost and the desired sales quantity refer to the same planning period.
No. It calculates the sales requirement under your assumptions but does not predict whether customers will buy that quantity.
Yes. Recalculate with different selling prices and variable costs to compare break-even scenarios.
Sources and methodology
The calculator uses the formulas described on this page and the values you enter. The sources below provide authoritative U.S. context for business planning, tax, recordkeeping or financial-statement concepts.