1. Enter price and variable cost
The difference between selling price and variable cost shows how much each unit contributes toward fixed costs and profit.
Profitability calculator
Contribution Margin Calculator
Calculate unit contribution, total contribution margin, contribution margin ratio, break-even sales, and the sales volume required to reach a target profit.
Instant margin results
Break-even analysis
Target-profit planning
Calculate your contribution margin
Enter selling price, variable cost, sales volume, fixed costs, and an optional profit target.
Variable costs change with production or sales volume, while
fixed costs generally remain stable within the relevant
operating range.
How the Contribution Margin Calculator works
The calculator subtracts variable cost from selling price to determine contribution per unit, then uses sales volume and fixed costs to estimate total contribution, break-even volume, and operating profit.
2. Add sales volume
Unit contribution is multiplied by units sold to calculate total contribution margin for the selected reporting period.
3. Review break-even and profit
Fixed costs are compared with unit contribution to estimate break-even units and the volume required for your target profit.
Unit Contribution
Selling Price per Unit − Variable Cost per Unit
Contribution Margin Ratio
Unit Contribution ÷ Selling Price × 100
Break-Even Units
Fixed Costs ÷ Unit Contribution
Signal
Possible meaning
What to review
Negative margin
Unsustainable unit economics
Variable cost exceeds selling price, so each additional sale increases the operating loss before fixed costs.
Low margin ratio
Limited cost coverage
A low ratio may require higher volume to cover fixed costs. Review pricing, discounts, materials, labour, fulfilment, and channel fees.
Strong margin ratio
Greater contribution per sale
A stronger ratio generally provides more room to cover fixed costs, invest in growth, and absorb changes in demand or operating expenses.
Above break-even
Operating profit generated
Once total contribution exceeds fixed costs, additional contribution generally increases operating profit, assuming costs remain within the relevant range.
Frequently asked questions
Key points for calculating and interpreting contribution margin accurately.
What is contribution margin?
Contribution margin is the revenue remaining after variable costs are subtracted. It contributes toward fixed costs, and any amount left after fixed costs becomes operating profit.
How is contribution margin calculated?
Unit contribution margin equals selling price per unit minus variable cost per unit. Total contribution margin equals unit contribution multiplied by the number of units sold.
What is the contribution margin ratio?
The contribution margin ratio shows the percentage of sales revenue remaining after variable costs. Divide contribution margin by sales revenue and multiply by 100.
What costs are considered variable costs?
Variable costs may include materials, production labour, transaction fees, sales commissions, packaging, shipping, and other costs that change directly with sales or production volume.
What costs are considered fixed costs?
Fixed costs commonly include rent, salaried management, insurance, software subscriptions, depreciation, and other costs that remain broadly stable within a relevant operating range.
How does contribution margin differ from gross margin?
Contribution margin subtracts all variable costs related to sales volume. Gross margin usually subtracts cost of goods sold according to accounting classifications, which may include some fixed costs.
How is break-even volume calculated?
Divide total fixed costs by contribution margin per unit. Because partial units normally cannot be sold, the calculator rounds the required break-even volume up to the next whole unit.
Can this calculator be used for service businesses?
Yes. Treat one service engagement, billable hour, subscription, project, or customer as the unit. Enter its selling price and the variable cost directly required to deliver that unit.