What is Contribution Margin?
Revenue minus variable costs, showing how much each customer or unit contributes to covering fixed costs and generating profit after accounting for the direct costs of serving them.
Understanding the Details
Contribution margin reveals the true profitability of serving each customer after accounting for the costs that scale with customers: hosting, support, payment processing, and third-party tools. A SaaS company with £100/month average revenue and £25/month variable costs per customer has a 75% contribution margin. This matters because it determines how much of each revenue pound actually contributes to covering fixed costs (engineering, office, G&A) and generating profit. Contribution margin analysis by segment reveals which customer types are most profitable to serve, informing pricing, packaging, and targeting decisions.
How It Works in Practice
Segment profitability
Enterprise customers have 85% contribution margin while SMB has 55% due to higher support costs, guiding segment investment strategy.
Pricing analysis
Contribution margin analysis reveals the basic plan has only 40% margin due to infrastructure costs, prompting a pricing increase or feature restructuring.
Channel efficiency
Combining contribution margin with CAC by channel shows content-acquired customers contribute 3x more lifetime profit than paid-acquired ones.
Why It Matters
Contribution margin shows which customers and segments actually generate profit. Without this understanding, you might grow revenue while losing money on each customer served.
What People Often Get Wrong
Contribution margin and gross margin are the same. Actually, contribution margin focuses on variable costs while gross margin includes some allocated fixed costs.
All revenue contributes equally. Actually, different customers, plans, and segments can have very different contribution margins.
Low contribution margin means the product is underpriced. Actually, it might indicate high variable costs that need optimisation.
How We Handle Contribution Margin
We analyse contribution margins by segment and channel to identify where growth investment generates the most profitable outcomes.
Related Terms
Common Questions
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