What Is the Contribution Margin?
Contribution margin is sales revenue less variable costs — the amount each sale contributes toward fixed costs and profit. Here's how to calculate and use it.
Contribution margin is sales revenue less variable costs. It's the amount each unit or each pound of sales 'contributes' toward covering fixed costs and, once those are covered, toward profit. It's one of the most useful figures in management accounting because it strips out fixed costs to show the real profitability of a product or decision.
How do you calculate contribution?
- Contribution per unit = selling price per unit − variable cost per unit.
- Total contribution = total sales revenue − total variable costs.
- Contribution margin ratio = contribution ÷ sales, expressed as a percentage.
Why contribution matters
Contribution is the engine of breakeven and decision-making. Fixed costs don't change with output in the short term, so contribution is what tells you whether making one more unit — or accepting a special order — improves profit. It's central to breakeven analysis, limiting-factor decisions and make-or-buy choices.
Contribution in ACCA PM and MA
In MA and PM you'll use contribution for breakeven, margin of safety, target profit and limiting-factor analysis. The common trap is including fixed costs where only variable costs belong. Practising these calculations and marking them against the official ACCA scheme with The 50% Club helps you avoid the classic slips and secure the method marks.