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Contribution Margin Calculator
Calculate your contribution margin—the amount of revenue left after covering variable costs to cover fixed costs and generate profit.
Calculate Contribution Margin
What is Contribution Margin?
Contribution margin measures the incremental profit earned for each unit sold, after subtracting variable costs. It shows how much revenue is available to cover fixed costs and contribute to profit.
The Formulas
Contribution Margin ($) = Revenue – Variable Costs
Contribution Margin Ratio (%) = (Revenue – Variable
Costs) ÷ Revenue × 100
Example Calculation
Per-Unit Example
Sale Price per Unit: $100
Variable Cost per Unit: $60
Contribution Margin: $100 – $60 = $40 per unit
CM Ratio: $40 ÷ $100 = 40%
Each unit sold contributes $40 toward covering fixed costs and profit.
Variable vs Fixed Costs
| VARIABLE COSTS (CHANGE WITH VOLUME) | FIXED COSTS (STAY CONSTANT) |
|---|---|
| Product/COGS | Rent/Office Lease |
| Shipping & Packaging | Salaries (non-commission) |
| Payment Processing Fees | Insurance |
| Sales Commissions | Software Subscriptions |
| Direct Labor | Depreciation |
Break-Even Analysis
Contribution margin is essential for calculating your break-even point:
Break-Even Units = Fixed Costs ÷ CM per Unit
Break-Even Revenue = Fixed Costs ÷ CM Ratio
Break-Even Example
Monthly Fixed Costs: $20,000
CM per Unit: $40
Break-Even: $20,000 ÷ $40 = 500 units/month
Why Contribution Margin Matters
Pricing Decisions: Helps determine minimum viable prices
Product Mix: Identify which products contribute most to profitability
Scale Decisions: Understand the profit impact of increased volume
Cost Control: Focus on reducing variable costs that directly impact margin
Contribution Margin vs Gross Margin
Unlike gross margin, contribution margin excludes fixed production costs (like factory overhead). It focuses purely on costs that vary with each unit sold—making it more useful for short-term decision making.
Interpreting Your Results
High CM (50%+): Strong profitability per unit. Room for discounts or increased marketing spend.
Moderate CM (30-50%): Healthy but monitor variable costs closely.
Low CM (<30%): Thin margins. Consider price increases or cost reduction strategies.
Negative CM: Losing money on each sale. Immediate action required.
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