Online Tool Store
Contribution Margin Calculator
Calculate contribution margin per unit and as a ratio, and find the break-even volume that covers fixed costs.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Finance
Contribution Margin Calculator
Frontend preview — no upload or external service.
Result
Contribution 1,800 per unit, a 40% margin ratio. Fixed costs of 540,000 need 300 units to break even; every unit after that adds 1,800 to profit.
How the Contribution Margin Calculator works
- Enter the selling price and the variable cost per unit — variable means it changes with volume.
- Add fixed costs for the period.
- Read break-even volume and treat contribution per unit as what each additional sale is genuinely worth.
The method
Contribution margin is what remains from a sale after variable costs, available to cover fixed costs and then to become profit.
contribution = price − variable cost; break-even units = fixed costs ÷ contribution
At 1,800 contribution against 540,000 of fixed costs, unit 300 covers the last of the fixed costs and unit 301 contributes 1,800 straight to profit.
FAQ
What counts as a variable cost?
Costs that change with each unit produced or sold — materials, direct labour where it genuinely scales, transaction fees, shipping. Rent and salaried staff are fixed even though they feel variable when you are paying them.
Why is contribution margin more useful than gross margin?
Because it isolates the decision-relevant number. When deciding whether one more sale is worth it, fixed costs are already committed — contribution tells you what that sale actually adds.
Should I ever sell below full cost?
Above variable cost and below fully-absorbed cost, an extra sale still contributes to fixed costs you are paying anyway. That logic is sound for genuine spare capacity and dangerous as a general pricing policy.
How we compare
| Feature | Online Tool Store | A spreadsheet | An advisor consultation |
|---|---|---|---|
| Break-even volume included | ✓ | Formula work | ✓ |
| Per-unit and ratio | ✓ | ✓ | ✓ |
| No accounting system | ✓ | ✓ | ✗ |
| Nothing stored | ✓ | ✓ | ✗ |
Contribution Margin Calculator reports break-even alongside the margin, since the margin only becomes a decision once you know how many units cover the fixed costs.