HesapHanem

Contribution Margin Ratio Calculator

Enter your sales and variable costs to compute the contribution margin ratio.

How it is calculated

The contribution margin is what is left of sales after the costs that rise and fall with volume. contribution margin = sales − variable costs, and CM ratio = contribution margin ÷ sales × 100. The tool also shows the opposite share, variable cost ratio = variable costs ÷ sales × 100, and the two percentages always add up to 100. Sales and variable costs must be for the same period and the same scope, for example a month of one product line, and sales must be above zero. Variable costs cannot be negative but may be larger than sales, which gives a negative margin. Amounts are shown in dollars with two decimals. Fixed costs are not part of this ratio, so it says nothing yet about profit.

Worked example

A business has sales of $125,000 and variable costs of $78,500 for the month. Contribution margin: 125,000 − 78,500 = $46,500.00. CM ratio: 46,500 ÷ 125,000 × 100 = 37.20%. Variable cost ratio: 78,500 ÷ 125,000 × 100 = 62.80%. So out of each dollar of sales, about 37 cents are left to pay fixed costs and leave a profit. Dividing fixed costs by 0.372 would give the sales needed to break even.

Try this example →

Common mistakes

  • Including fixed costs such as rent or salaries in variable costs. That lowers the ratio and defeats the purpose of the measure.
  • Mixing periods or scopes, for example annual sales with monthly variable costs.
  • Confusing the contribution margin ratio with gross margin or net margin. Gross margin uses cost of goods sold, and the variable costs here can include items such as commissions and shipping.
  • Entering the margin instead of variable costs. If you type the amount left after costs, the ratio comes out as its complement.
  • Ignoring a negative result. When variable costs exceed sales, every extra sale loses money and the ratio is below zero.

Sources

About this calculator

The contribution margin ratio is (Sales − Variable Costs) / Sales, expressed as a percentage — it tells you what fraction of every sales dollar is left over after variable costs (materials, sales commissions, shipping, and similar costs that scale with volume) to go toward covering fixed costs and, beyond that, profit.

It is a core input of cost-volume-profit (CVP) analysis in managerial accounting: dividing total fixed costs by the contribution margin ratio gives the break-even sales figure, and the ratio also shows how sensitive operating profit is to changes in sales volume — a business with a high ratio sees profit swing sharply with sales, while a low ratio means more revenue is needed just to reach the same profit change.

Was this helpful?

You can pick up to 3 reactions.

Comments (1)

  • Editorial team

    Run the ratio per product line rather than for the whole business, because the blended figure hides weak items. Sales of 125,000 with variable costs of 78,500 give 37.20 percent, a healthy cushion for fixed costs. Sales of 1000 against variable costs of 1200 give -20.00 percent: each sale deepens the loss before rent is even counted. Do you split your variable costs by product, and what do you include in them?

Popular calculators

Loan Calculator

Monthly payment, total interest and full amortization schedule.

Percentage Calculator

Percent change, percent of, and ratio calculations.

Discount Calculator

Calculate final price, savings, and discount amount.

BMI Calculator

Body mass index from height and weight (metric or imperial).

Age Calculator

Compute your exact age in years, months and days from a birth date.

Compound Interest Calculator

Calculate the final amount and interest earned with compounding.

All Calculators