Contribution Margin Ratio Calculator
Reviewed by Hamza Gujjar, Algorithm Architect & Software Developer
Last updated: July 27, 2026
Disclaimer: This calculator is provided for informational and educational purposes only and does not constitute financial, medical, legal, or other professional advice. Always consult a qualified professional before making decisions based on these results.
Different from gross margin, and more useful for break-even math
Gross margin subtracts cost of goods sold, a mix of fixed and variable costs, while contribution margin specifically isolates variable costs only - this distinction makes contribution margin the correct figure for break-even and what-if profitability analysis.
Worked example
For $200,000 in revenue against $120,000 in total variable costs:
CM Ratio = (200000 - 120000) / 200000 x 100 = 40.0%
This 40% figure means every additional dollar of sales contributes 40 cents toward covering fixed costs and, once fixed costs are fully covered, straight to profit - this is exactly the number used to calculate break-even revenue (Fixed Costs / Contribution Margin Ratio) for a business.