Contribution Margin Calculator
Find the contribution margin per unit, the contribution margin ratio, and total contribution margin from price, variable cost, and volume. Educational. Runs in your browser.
Variable costs change with volume (materials, packaging, payment fees, shipping). Leave fixed costs like rent and salaries out.
Contribution margin is the revenue from a sale that remains after variable costs, available to cover fixed costs and then profit. Per unit it is price − variable cost; the ratio is that divided by price. Total contribution margin (per-unit × units) is what must exceed total fixed costs to break even. A higher ratio means each extra sale contributes more, so volume scales profit faster. Educational; everything runs in your browser.
About this tool
Contribution margin is one of the most useful numbers in everyday business decisions: it is the portion of each sale that is left over after the variable costs of making that sale, money that then goes toward covering fixed costs and, beyond that, profit. Per unit it is simply the selling price minus the variable cost per unit. The contribution margin ratio expresses the same thing as a percentage of price (contribution margin ÷ price), which is handy for comparing products of different prices. Total contribution margin scales the per-unit figure by the number of units sold, and that total is what has to exceed your fixed costs — rent, salaries, software — before the business makes any profit. The key distinction the tool relies on is variable versus fixed costs: variable costs rise and fall with each unit (raw materials, packaging, shipping, payment-processing fees, hourly labor tied to output), while fixed costs stay roughly the same regardless of volume and are deliberately excluded here. Contribution margin drives pricing, product-mix, and break-even decisions: a product with a high contribution margin ratio turns extra volume into profit quickly, while a thin margin means you need to sell a lot to cover overhead. It is educational. Everything runs in your browser; nothing is uploaded.
How to use it
- Enter the selling price per unit.
- Enter the variable cost per unit — only costs that change with volume, not fixed overhead.
- Enter the number of units sold.
- Read the contribution margin per unit, the ratio, and the total available to cover fixed costs and profit.
Frequently asked questions
- What is contribution margin?
- It is the revenue from a sale that remains after variable costs, available to cover fixed costs and then contribute to profit. Per unit: selling price − variable cost per unit.
- What is the contribution margin ratio?
- The contribution margin expressed as a percentage of the selling price: (price − variable cost) ÷ price × 100. A 40% ratio means 40 cents of every sales dollar is left to cover fixed costs and profit.
- How is contribution margin different from gross profit?
- Contribution margin subtracts all variable costs (including variable selling and shipping costs), while gross profit subtracts cost of goods sold. They overlap but are not identical; contribution margin is the better tool for break-even and pricing analysis.
- Which costs count as variable?
- Costs that change with each unit produced or sold — raw materials, packaging, shipping, payment-processing fees, and output-based labor. Fixed costs such as rent, salaries, and subscriptions are excluded because they do not change with volume.
- How does contribution margin relate to break-even?
- Break-even units = total fixed costs ÷ contribution margin per unit. The higher the contribution margin, the fewer units you need to sell to cover fixed costs and start earning profit.
- Is anything uploaded?
- No. All calculations run entirely in your browser.