Gross Margin Explained: What It Is and Why Investors Care

Gross margin is one of the most scrutinized metrics in any investor conversation. It reveals the fundamental economics of your business: how much you keep from each dollar of revenue after covering the direct costs of delivering your product or service.

Here’s how to calculate it, interpret it, and improve it.

The Formula

Gross Profit = Revenue - Cost of Goods Sold (COGS)

Gross Margin = Gross Profit ÷ Revenue × 100

Example:

• Revenue: $500,000
• COGS: $150,000
• Gross Profit: $350,000
• Gross Margin: 70%

For every dollar you bring in, you keep 70 cents after covering direct costs. The remaining 70 cents covers operating expenses, generates profit, or funds growth.

What Counts as COGS?

This is where companies go wrong. COGS includes only the direct costs of delivering your product or service: costs that scale directly with revenue.

For SaaS Companies

Include in COGS:

• Cloud hosting and infrastructure (AWS, GCP, Azure)
• Third-party software directly used in delivery (payment processing, APIs)
• Customer support salaries (if dedicated to existing customers)
• DevOps/SRE salaries (if primarily focused on keeping the product running)

Exclude from COGS:

• Sales and marketing
• Product development (building new features)
• General and administrative
• Office rent and overhead

For E-Commerce

Include in COGS:

• Product cost (what you paid for inventory)
• Shipping and fulfillment
• Payment processing fees
• Warehouse labor directly tied to fulfillment

Exclude from COGS:

• Marketing spend
• Website development
• Corporate overhead

For Services Companies

Include in COGS:

• Billable employee salaries and benefits
• Contractor costs for client work
• Direct project expenses

Exclude from COGS:

• Non-billable staff
• Sales and business development
• Administrative overhead

The test: if you sold one more unit, would this cost increase? If yes, it’s COGS. If no, it’s an operating expense.

Why Gross Margin Matters

It Determines Scalability

A company with 80% gross margin has 80 cents from every dollar to cover fixed costs and generate profit. A company with 30% gross margin has only 30 cents.

The 80% margin company can invest more in growth, absorb market downturns, and reach profitability faster. The 30% margin company needs massive scale to achieve the same absolute profits.

It Signals Business Model Quality

Different business models have characteristic gross margins:

Business Type	Typical Gross Margin
SaaS	70-85%
Marketplace	60-80%
E-commerce	25-45%
Hardware	30-50%
Professional services	50-70%
Restaurants	60-70%

Investors benchmark your margin against comparable companies. A SaaS company with 50% gross margin raises questions about cost structure or product delivery.

It Predicts Profitability Potential

Operating expenses can be controlled. Gross margin is harder to change without fundamentally altering the business model.

If your gross margin is 40% and operating expenses are 60% of revenue, you’re losing money, and you can’t cost-cut your way to profitability. The unit economics don’t work.

If your gross margin is 75% and operating expenses are 80% of revenue, you’re also losing money. But scaling revenue while holding operating expenses relatively flat gets you to profitability. The unit economics work.

Calculating Gross Margin Correctly

Be Consistent

The specific items you include in COGS matter less than consistency. If you include customer support in COGS this quarter, include it every quarter. Changing definitions makes trends meaningless.

Be Conservative

When in doubt, include costs in COGS rather than operating expenses. Inflating gross margin by misclassifying costs will catch up with you, usually during due diligence.

Separate by Product Line

If you have multiple products with different cost structures, calculate gross margin for each. A blended number can hide problems.

Example:

• Product A: $300K revenue, 80% margin
• Product B: $200K revenue, 40% margin
• Blended: $500K revenue, 64% margin

The blended number looks acceptable. But Product B’s margin signals a problem: either pricing, cost structure, or strategic fit.

Improving Gross Margin

Pricing Power

The simplest lever: charge more. If you can raise prices 10% without losing customers, your gross margin improves immediately.

Pricing power comes from:

• Product differentiation
• High switching costs
• Strong brand
• Low price sensitivity in your market

Cost Reduction

Reduce COGS without affecting quality or delivery:

• Negotiate better vendor rates at scale
• Optimize infrastructure efficiency
• Automate manual processes
• Reduce support burden through better product design

Mix Shift

Shift revenue toward higher-margin products or customer segments:

• Upsell premium tiers with better margins
• Reduce focus on low-margin products
• Target customer segments with lower support costs

Pricing Model Changes

Sometimes the model itself is the problem:

• Move from one-time to subscription (spreads support costs over longer customer lifetime)
• Add usage-based pricing for heavy users
• Implement tiered support with premium options

Common Mistakes

Excluding Real Costs

Putting direct costs into operating expenses to inflate gross margin. This backfires when investors do their own analysis or when you try to understand true unit economics.

Including Indirect Costs

Including product development, marketing, or overhead in COGS. This deflates gross margin and obscures the true cost of delivery.

Ignoring Margin Trends

A declining gross margin signals trouble: rising costs, pricing pressure, or mix shifting toward lower-margin revenue. Address it early.

Comparing Unlike Businesses

An 80% gross margin for a hardware company is extraordinary. For a SaaS company, it’s average. Context matters.

Gross Margin in Your Forecast

Model gross margin explicitly:

1. Revenue by product/segment: Break down where revenue comes from
2. COGS by category: List each cost that scales with revenue
3. COGS as % of revenue: For each category, what percentage of revenue does it represent?
4. Project forward: As revenue grows, how do COGS categories change?

Some COGS scale linearly (payment processing fees). Others have step functions (you add support staff every 100 customers). Others have economies of scale (hosting cost per user decreases with volume).

Model each accurately.

Key Takeaways

• Gross margin measures the direct profitability of your product or service
• Include only costs that scale directly with revenue in COGS
• Compare your margin to relevant industry benchmarks
• Track margin trends over time (declines signal problems)
• Improve margin through pricing, cost reduction, or mix shift

A strong gross margin gives you room to invest, weather downturns, and build a sustainable business. Know your number and what drives it.

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