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Estimate contribution margin per unit from selling price and variable cost inputs.
Use this contribution margin calculator when you want to know how much each unit contributes toward fixed costs and profit. The calculator is designed to give a fast answer, but the quality of the answer still depends on accurate inputs and a clear idea of what decision you are trying to support.
- Enter Fixed Costs, Variable Cost per Unit, and Selling Price per Unit using the same units you plan to compare or report.
- Read the main contribution margin first, then use the supporting outputs to understand the trade-offs behind that result.
- Compare your numbers with the worked examples below if you want a quick reasonableness check.
The main output tells you how much sales volume is needed before the business stops losing money. Contribution margin explains why that threshold moves. On this page, the primary output is contribution margin.
Scenario 1: $44 selling price and $17 variable cost. Inputs used: fixedCosts: 6000, variableCost: 17, sellingPrice: 44. Example result: $27.00. In this unit-economics scenario, the contribution margin comes to $27.00 per unit. Scenario 2: $125 selling price and $68 variable cost. Inputs used: fixedCosts: 18000, variableCost: 68, sellingPrice: 125. Example result: $57.00. This product leaves $57.00 per unit to cover fixed costs and profit.
Core formula: break-even units = fixed costs / (selling price - variable cost). The tool calculates the contribution margin per unit first, then determines how many units are needed to cover fixed costs.
- If contribution margin is zero or negative, break-even is impossible.
- Revenue at break-even equals units multiplied by selling price.
Use this calculator before setting prices, launching a product, or reviewing whether fixed costs are realistic for your current sales model. Related paths for follow-up analysis include break even calculator, break even sales calculator, gross margin calculator, and markup calculator.
Most bad outputs come from a few repeated input errors or interpretation mistakes. Use this short checklist before relying on the result.
- Using average cost instead of variable cost per unit.
- Ignoring fixed costs that still need to be covered each month.
- Assuming break-even means healthy profit instead of zero operating profit.
