Stock Charted
Glossary

Contribution Margin

Contribution margin is the portion of a sale's revenue left after subtracting variable costs, showing how much each sale contributes toward covering fixed costs and generating profit.

What Is Contribution Margin?

Contribution margin is a measure of how much money each unit a company sells leaves over after paying the costs that rise and fall with production or sales volume. Those costs are called variable costs. Examples include raw materials, packaging, sales commissions, and shipping. Whatever is left after those costs is available to pay fixed costs such as rent, salaries, insurance, and loan payments, and then to produce profit.

The idea is useful because it separates costs into two groups. Fixed costs stay roughly the same whether a company sells ten units or ten thousand. Variable costs change with sales volume. Contribution margin focuses on the second group, which makes it easier to see how each additional sale affects the bottom line.

How It Is Calculated

Contribution margin can be expressed as a dollar amount per unit or as a percentage of revenue. The basic formulas are:

Contribution Margin = Sales Revenue - Variable Costs

Contribution Margin Ratio = Contribution Margin / Sales Revenue x 100

An Example

Suppose a company sells a product for $50 per unit. The variable cost of making and shipping each unit is $30. The contribution margin per unit is $20, and the contribution margin ratio is 40 percent. For every $1 of sales, $0.40 remains to cover fixed costs and profit. If the company's fixed costs are $10,000 per month, it would need to sell 500 units in a month to cover them, since 500 units times $20 equals $10,000. Each unit sold beyond that point adds $20 to profit.

Why It Matters to Investors

Contribution margin helps investors understand how sensitive a company's profits are to changes in sales. A business with a high contribution margin generally earns more from each additional sale, so a rise in sales can lift profits quickly. The same business can also see profits fall quickly if sales drop, because its fixed costs remain in place. Comparing contribution margins across companies in the same industry can offer a rough view of pricing power and cost structure, though the figure is only one part of a full financial analysis and does not account for every expense.

Updated October 18, 2026. For general education only; not financial, tax or legal advice.

Browse the Glossary

Related Terms

Variable Cost

A variable cost is a business expense that rises or falls in direct proportion to the quantity of goods or services a company produces or sells.

Fixed Cost

A fixed cost is a business expense that stays the same in total over a given period regardless of how much a company produces or sells within a normal range of activity.

Gross Margin

Gross margin is the percentage of a company's revenue that remains after subtracting the direct costs of producing the goods or services it sells, showing how much each sales dollar contributes.

Operating Leverage

Operating leverage measures how much a company's operating income changes in response to a change in its sales, driven by the mix of fixed and variable costs in its cost structure.

Net Profit Margin

A profitability ratio showing the percentage of a company's total revenue that remains as net income after all expenses, taxes, and interest are deducted.