Find contribution margin — how much revenue is left over to cover fixed costs and profit after variable costs are paid.
How it works
The formula is contribution margin = revenue − variable costs. $10,000 in revenue against $6,000 in variable costs leaves a $4,000 contribution margin.
What this does not include
This calculates total or per-unit contribution margin from revenue and variable costs directly — it doesn’t separately break out fixed costs, which are subtracted from contribution margin (not from revenue directly) to find final profit.
How to use this calculator
- Enter total revenue.
- Enter total variable costs.
A worked example
$10,000 revenue with $6,000 in variable costs: contribution margin = 10,000 − 6,000 = $4,000.
$5,000 revenue with $3,200 variable costs: contribution margin = $1,800.
What the variables mean
| Variable | Meaning |
|---|---|
| Revenue | Total sales revenue |
| Variable costs | Costs that scale directly with production or sales volume |
Edge cases worth knowing
This excludes fixed costs entirely — rent, salaries, and other costs that don’t change with sales volume aren’t part of this figure, which is what makes contribution margin useful for per-unit profitability decisions rather than overall profit.
A missing revenue figure makes the calculation impossible — there’s no top-line number to subtract variable costs from, so the calculator declines to show a result.
How is contribution margin different from gross profit?
Gross profit subtracts all costs of goods sold (which can include some fixed manufacturing costs); contribution margin specifically subtracts only variable costs, making it more directly useful for break-even and pricing decisions.
Why does contribution margin matter for break-even analysis?
Break-even point is found by dividing total fixed costs by contribution margin — a higher contribution margin means fewer units or less revenue needed to cover fixed costs.
Can contribution margin be negative?
Yes — if variable costs exceed revenue, every unit sold loses money before even considering fixed costs, a clear signal something in the pricing or cost structure needs to change.
