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Break-Even and Contribution Planning

Choose the right contribution boundary, account for sales mix and capacity, and check whether a break-even threshold exists for your inputs.

By PriceAndProfit Editorial Updated

Choose the right contribution boundary, account for sales mix and capacity, and check whether a break-even threshold exists for your inputs.

Start with the question you need to answer, then choose the tool or worked example that uses the same cost boundary and time period. The guides explain the assumptions behind each calculation. All sample amounts are hypothetical; replace them with your own records before making a plan.

Break-even work starts with cost behavior. Every figure on this page depends on sorting costs into the ones that stay the same each month and the ones that grow with each unit, order or hour. The fixed vs variable costs comparison shows how each behaves in total and per unit; the high-low method guide and calculator split a mixed cost, such as a delivery contract with a monthly minimum, into its fixed part and its variable rate using your own records. Marginal cost — what the next batch actually adds — and average cost answer different pricing questions, and the comparison between them explains when an extra order below average cost still makes money.

Contribution is the next layer. Contribution margin per unit, its ratio to price and the total for a period tell you how much each sale leaves for fixed costs. The contribution margin calculator gives all three plus operating income, and the contribution margin income statement lays out a whole month so that what-if questions about volume have direct answers. The break-even calculator, the break-even chart and the guides on sales mix, capacity and margin of safety then turn those numbers into the volume you need.

Investment decisions use the same discipline. The ROI and payback period calculators measure a machine, a software plan or a campaign on its incremental cash, without discounting, and the comparisons explain why the option that pays back first is not always the one that returns the most, and why a high profit margin can still mean a low return on the money tied up. The equipment worksheet walks one purchase through payback, ROI and a what-if. Production decisions — special orders, bottlenecks, selling or processing further — sit at the end, because each of them is a contribution comparison on a narrower question.

Calculators

Run your own inputs through the documented models.

Contribution

Choose a specific decision or comparison.

Production Decisions

Choose a specific decision or comparison.

Reference tables and worked examples

Inspect the intermediate numbers and the limits of the model.

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