Comparison
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Gross Margin vs Contribution Margin
Quick Answer
Gross margin measures revenue minus cost of goods sold as a percentage, while contribution margin subtracts all variable costs (including sales and marketing) to show how much each unit contributes to covering fixed costs.
What is Gross Margin?
Gross margin is the percentage of revenue remaining after subtracting the cost of goods sold (COGS). For SaaS companies, COGS typically includes hosting costs, customer support, and third-party software costs directly tied to delivering the product. A SaaS company with 80% gross margins keeps $0.80 of every revenue dollar after direct delivery costs. Gross margin is the most commonly cited profitability metric in VC due diligence and is a key indicator of business model quality.
What is Contribution Margin?
Contribution margin measures the profit from each unit or customer after subtracting ALL variable costs — not just COGS but also variable sales, marketing, and onboarding costs. It answers: 'How much does each incremental customer contribute to covering our fixed costs (rent, salaries, R&D)?' Contribution margin is always lower than gross margin because it includes more cost categories. It's the more complete picture of unit-level profitability.
Key Differences
| Feature | Gross Margin | Contribution Margin |
|---|---|---|
| What's Subtracted | Only COGS — direct costs of delivering the product/service | All variable costs — COGS plus variable sales, marketing, onboarding |
| What It Measures | Efficiency of production/delivery — how cheaply you deliver value | Unit economics — how much each sale contributes to fixed cost coverage |
| Typical SaaS Range | 70-85% for healthy SaaS, 50-70% for services-heavy models | 40-70% depending on sales model and customer acquisition costs |
| Use in VC | Primary metric in investor decks — signals business model quality | Used in detailed financial analysis — signals path to profitability |
| Includes Sales Costs | No — sales and marketing are excluded from COGS | Yes — variable sales commissions and acquisition costs are included |
| Includes Marketing | No — marketing is an operating expense, not COGS | Yes — variable marketing spend per customer is included |
| Benchmark Comparison | Easy to compare across companies — COGS definition is fairly standard | Harder to compare — companies define 'variable costs' differently |
When Founders Choose Gross Margin
- →Use gross margin when evaluating business model quality at a high level, comparing across companies, or presenting to investors. It's the standard metric in pitch decks and earnings reports. High gross margins (70%+) signal a scalable, software-driven business.
When Founders Choose Contribution Margin
- →Use contribution margin when analyzing unit economics, deciding whether to invest in growth, or evaluating whether a specific customer segment is profitable. It's more useful for operational decisions because it captures the true cost of acquiring and serving each customer.
Example Scenario
A SaaS company charges $1,000/month per customer. COGS (hosting, support) is $150/month = 85% gross margin. But variable sales costs are $200/month (amortized commission) and variable marketing is $100/month (allocated CAC). Contribution margin: ($1,000 - $150 - $200 - $100) / $1,000 = 55%. The 85% gross margin looks great, but the 55% contribution margin reveals the true cost of each customer relationship.
Common Mistakes
- 1Quoting gross margin when contribution margin would be more honest about profitability. Hiding high sales costs behind strong gross margins. Not defining COGS consistently — some companies bury costs in other line items to inflate gross margins. Using gross margin to justify scaling when contribution margin is negative (you lose money on every customer even before fixed costs).
Which Matters More for Early-Stage Startups?
Gross margin matters more for business model assessment and investor communication. Contribution margin matters more for operational decision-making and understanding true unit economics. A company can have 80% gross margins but negative contribution margins if customer acquisition costs are too high — which means scaling faster actually accelerates losses.
Related Terms
Frequently Asked Questions
What is Gross Margin?
Gross margin is the percentage of revenue remaining after subtracting the cost of goods sold (COGS). For SaaS companies, COGS typically includes hosting costs, customer support, and third-party software costs directly tied to delivering the product. A SaaS company with 80% gross margins keeps $0.80 of every revenue dollar after direct delivery costs. Gross margin is the most commonly cited profitability metric in VC due diligence and is a key indicator of business model quality.
What is Contribution Margin?
Contribution margin measures the profit from each unit or customer after subtracting ALL variable costs — not just COGS but also variable sales, marketing, and onboarding costs. It answers: 'How much does each incremental customer contribute to covering our fixed costs (rent, salaries, R&D)?' Contribution margin is always lower than gross margin because it includes more cost categories. It's the more complete picture of unit-level profitability.
Which matters more: Gross Margin or Contribution Margin?
Gross margin matters more for business model assessment and investor communication. Contribution margin matters more for operational decision-making and understanding true unit economics. A company can have 80% gross margins but negative contribution margins if customer acquisition costs are too high — which means scaling faster actually accelerates losses.
When would you encounter Gross Margin vs Contribution Margin?
A SaaS company charges $1,000/month per customer. COGS (hosting, support) is $150/month = 85% gross margin. But variable sales costs are $200/month (amortized commission) and variable marketing is $100/month (allocated CAC). Contribution margin: ($1,000 - $150 - $200 - $100) / $1,000 = 55%. The 85% gross margin looks great, but the 55% contribution margin reveals the true cost of each customer relationship.
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