Contribution Margin
Contribution margin is a cost accounting concept that allows
a company to determine the profitability of individual products. The phrase
"contribution margin" can also refer to a per unit measure of a product's
gross operating margin calculated simply as the product's price minus its total
variable costs. This metric allows an entity to evaluate different areas of
business to determine which service or product line to emphasize based on the
highest margin.
Contribution margin is calculated by reducing the sales
price by the total variable costs – regardless if the cost is materials, labor
or overhead. For example, Company XYZ sells an item for $100. The company
incurs a unit variable direct material expense of $12, unit variable labor
expense of $25, $10 of variable overhead per unit and $8 of fixed overhead per
unit. The contribution margin of one unit is ($100 - $12 - $25 - $10) $53
because the fixed overhead per unit of $8 is not considered.
Contribution margin is used by management when making
pricing decisions. This is especially true in special pricing or special order
situations where fixed costs are sunk costs and should not be factored into the
decision whether to accept or reject. Negative or low contribution margins
indicate a product line or business segment may not be profitable. In addition,
the contribution margin is helpful to analyze the impact of different levels of
sales. Finally, a business can use contribution margin to resolve bottlenecks.
If limited resources are available, a business wants to contribute that scarce
resource towards the most profitable items. Therefore, constraints are
eliminated by awarding the most profitable items the resources.
The contribution margin is an integral aspect when
calculating the break-even point of sales or a target level of sales. The
contribution margin determines the portion of each sale that is attributed to
covering fixed costs. For this reason, fixed costs divided by the contributionmargin results in the number of units needed to be sold to break-even. To find
a target net income, the target amount is added to total fixed costs.
Contribution margin is directly related to the contribution
margin ratio. The contribution margin ratio can be calculated on a per-unit
basis or an aggregate basis. The per-unit basis divides the contribution margin
per unit by the unit sale price, while the total contribution margin ratio
divides the total contribution margin by the total revenue. The figure will
result in a percentage that indicates what percentage of each dollar of revenue
is generated to cover fixed costs. This metric is calculated by dividing the
contribution margin by revenue.
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