Contribution Margin Calculator
Calculate contribution margin per unit and as a ratio, and see how much each sale contributes toward covering fixed costs and generating profit.
⚖️ Profitability📐 Contribution margin = price − variable cost per unit💼 Business
Selling price per unit
Variable cost per unit
Units sold per period
Fixed costs per period
Please enter valid values.
Formula & Reference
| Variable | Symbol | Formula | Units |
|---|---|---|---|
| Contribution Margin Calculator | — | Contribution margin = price − variable cost per unit | currency and percent |
Step-by-Step Examples
Example 1
Healthy Margin
Price 80, variable cost 48, 2,500 units, fixed costs 60,000.
- Contribution margin = 80 − 48 = 32 per unit
- Ratio = 32 / 80 = 40.0%
- Total contribution = 32 × 2,500 = 80,000
- Operating profit = 80,000 − 60,000 = 20,000
- Break-even = 60,000 / 32 = 1,875 units
✓ 32 per unit (40.0%), break-even 1,875 units
Example 2
Thin Margin
Price 25, variable cost 21, 12,000 units, fixed costs 40,000.
- Contribution margin = 4 per unit
- Ratio = 16.0% — thin
- Total contribution = 48,000
- Operating profit = 8,000
- Break-even = 10,000 units — most volume just covers fixed costs
✓ 4 per unit (16.0%), break-even 10,000 units
Example 3
Negative Contribution
Price 30, variable cost 34.
- Contribution margin = 30 − 34 = −4
- Every unit sold deepens the loss
- No volume can reach break-even at this price
✓ −4 per unit — each sale increases losses
Real-World Applications
Break-Even Analysis
Contribution margin is the denominator in break-even calculations — fixed costs divided by contribution per unit.
Pricing Decisions
Knowing contribution per unit shows exactly how much a discount costs and how much extra volume it must generate to be worthwhile.
Product Mix
Ranking products by contribution margin rather than revenue reveals which ones actually fund the business.
Order Acceptance
Any order above variable cost contributes something toward fixed costs, which matters when deciding on marginal business.
Common Mistakes to Avoid
⚠️
Confusing contribution margin with gross margin
Gross margin subtracts cost of goods sold, which often includes fixed manufacturing overhead. Contribution margin subtracts only genuinely variable costs.
⚠️
Misclassifying fixed costs as variable
Costs that do not change with each additional unit belong in fixed costs. Including them understates contribution and distorts break-even.
⚠️
Ranking products by revenue instead of contribution
A high-revenue product with thin contribution can fund less of your overhead than a smaller product with strong margins.
Frequently Asked Questions
What is contribution margin? ▾
Selling price minus variable cost per unit — the amount each sale contributes toward covering fixed costs and, beyond break-even, toward profit.
How is it different from gross margin? ▾
Gross margin subtracts all cost of goods sold including fixed production overhead. Contribution margin subtracts only costs that vary directly with volume.
What is a good contribution margin ratio? ▾
It varies widely by model. Software often exceeds 80%, manufacturing might run 25 to 40%, and retail can be lower still with high turnover compensating.
How does contribution margin relate to break-even? ▾
Break-even volume equals fixed costs divided by contribution margin per unit — the number of units needed before fixed costs are fully covered.
Should I accept an order below full cost? ▾
If it exceeds variable cost it contributes toward fixed costs, which can make sense for spare capacity. But repeated below-cost pricing erodes the overall margin structure.