Contribution Margin Calculator Guide
Contribution Margin
Contribution margin shows how much each unit contributes toward covering fixed costs and generating profit.
Core Formulas
- Contribution margin per unit = price − variable cost
- Contribution margin ratio = (price − variable cost) / price
- Total contribution = sales − total variable costs
Use the ratio to assess product mix and pricing; higher ratios generally improve profitability at a given volume.
Example
Price $60, variable cost $38.
- Contribution per unit = 60 − 38 = $22
- Contribution ratio = 22 / 60 = 36.67%
If 3,000 units are sold, total contribution = 3,000 × 22 = $66,000.
Step-by-Step
- Determine unit price and variable cost per unit.
- Compute unit contribution and the contribution ratio.
- Multiply by volume to estimate total contribution.
- Compare to fixed costs to estimate profit (Profit ≈ Total contribution − Fixed costs).
Sensitivity & Pitfalls
- Volume changes have linear impact only if variable cost and price remain constant.
- Discounts reduce price and margin; adjust the ratio accordingly.
- For multi-product lines, use weighted-average contribution based on mix.