How to Use the Contribution Margin Calculator
Contribution margin is selling price minus variable cost — the money each additional sale contributes toward fixed costs. Subtract fixed costs from the total and you have operating income, which is why this is the first number to look at when setting prices or pruning a menu.
Only costs that scale with volume belong in the variable bucket: materials, packaging, shipping, and card processing fees. Rent, base payroll, and depreciation are fixed and go in the separate field, otherwise the margin is understated.
The contribution margin ratio divides the per-unit margin by price. When comparing products at different price points, the ratio is more informative than the dollar amount and shows which items deserve the push.
Adding monthly fixed costs produces operating income and break-even units. If contribution margin is zero or negative, every additional sale deepens the loss and break-even does not exist at that price. Treat the output as a planning estimate and verify costs against your books.
Frequently Asked Questions
Contribution margin subtracts only variable costs; gross profit subtracts cost of goods sold, which usually bundles in fixed items such as factory rent or supervisor salaries. For pricing and volume decisions, contribution margin gives the cleaner answer.
Yes. They scale with each transaction, so they belong in variable cost, along with delivery platform commissions, packaging, and shipping.