BizFormula

Pricing & Profit

Contribution Margin Calculator

Calculate contribution margin and contribution margin ratio from revenue and variable costs.

See how much revenue is left after variable costs to cover fixed costs and profit.

Enter your values

Sales revenue for the period, product, or segment you are analysing.

$

Costs that change with sales volume for the same scope.

$

Results

Contribution margin

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Enter revenue and variable costs.

Contribution margin ratio

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Contribution as a percentage of revenue.

Revenue

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The revenue figure entered.

Variable costs

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The variable costs entered.

Results are estimates based on the values entered and are provided for general planning.

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Step by step

How to use the contribution margin

  1. Enter Revenue for the product, period, or segment you are analysing.
  2. Enter the Variable costs for the same scope — only costs that move with sales volume.
  3. Read the contribution margin in dollars and as a percentage of revenue.

Method

How to calculate contribution margin

Contribution margin isolates the money a sale contributes once the costs caused by that sale are removed. Whatever remains is what the business has available to pay fixed costs; anything above the fixed-cost total becomes operating profit.

Formula

Contribution margin = Revenue − Variable costs
Contribution margin ratio = Contribution margin ÷ Revenue × 100

Assumptions

  • Revenue and variable costs cover the same period, product, or segment.
  • Only costs that move with sales volume are entered as variable costs.
  • Fixed costs such as rent, salaried payroll, and software are deliberately excluded.

The ratio is calculated at full precision before display. Currency displays two decimals; the ratio displays two decimals.

How to interpret the result

A positive contribution margin means each additional sale helps cover fixed costs. A negative contribution margin means more sales increase the loss, because the variable costs of serving the sale exceed the revenue it brings in. The ratio makes contribution comparable across products of different sizes.

Worked example: comparing two products

Product A brings $12,000 of revenue with $7,200 of variable costs: a $4,800 contribution margin, or 40%. Product B brings $8,000 with $3,600 of variable costs: $4,400, or 55%. Together they contribute $9,200; against $6,000 of shared fixed costs, that leaves $3,200 of operating profit.

When to use it: choosing what to promote

Product B sells less but keeps 55 cents of every sales dollar versus 40 cents for A. When deciding where to spend promotion budget or limited production time, the higher ratio usually adds more toward fixed costs per extra dollar of sales, provided demand exists.

Classifying costs by behaviour

A cost is variable when it rises and falls with volume: materials, per-unit freight, payment processing, packaging, per-order fulfillment labour, sales commissions. A cost is fixed when it does not change within the period: rent, salaries, subscriptions, insurance.

Some costs are mixed. A warehouse with a base rent plus per-pallet handling charges has both. Split them where you can, and document the split so results are comparable between periods.

Using contribution margin in decisions

Contribution margin is the right measure when you are deciding whether to take an additional order, keep a product line, or run a promotion, because those decisions change volume but not fixed costs in the short term.

It is not the right measure for judging whether the business as a whole is profitable — that requires fixed costs, overhead, interest, and tax as well.

Contribution margin next to related measures

These measures use different cost sets and answer different questions.

MeasureFormulaWhat it shows
Contribution marginRevenue − Variable costsWhat a sale contributes toward fixed costs.
Gross profitRevenue − Cost of goods soldRevenue after accounted direct product costs.
Net profitRevenue − All expensesWhat remains after fixed costs, interest, and tax.

Frequently asked questions

It is revenue minus the variable costs caused by producing and delivering that revenue. It represents the amount available to cover fixed costs before any profit is earned.

No. Gross profit subtracts cost of goods sold as classified in the accounts, which often includes some fixed production costs and excludes variable selling costs. Contribution margin subtracts all variable costs regardless of where they sit in the income statement.

No. Profit margin is a percentage of selling price after a defined cost, and net profit is what remains after every expense including fixed costs, interest, and tax. Contribution margin stops before fixed costs.

Yes, and this calculator treats it as valid. If variable costs exceed revenue, the contribution margin is negative and each extra sale makes the position worse under the entered figures.

The contribution margin is simply the negative of variable costs, and the ratio is not defined because it would divide by zero. The calculator shows N/A rather than a misleading number.

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