What Is a Good Contribution Margin for Your Business?

Your gross margin is 82 percent and your investors are happy. But when you calculate how much each customer actually contributes after accounting for customer success, payment processing, and variable infrastructure, the real number is 61 percent. That gap is the difference between gross margin and contribution margin, and it is where most founders get their unit economics wrong. OpenView Partners surveyed 519 SaaS companies in 2025 and found that founders routinely overstate contribution margin by 15 to 30 percentage points when they use gross margin as a proxy. Use our Contribution Margin Calculator to find your actual number before your next board meeting or fundraising round.

What Is Contribution Margin

Contribution margin is the percentage of revenue left after subtracting all variable costs directly tied to serving customers. It tells you how much each dollar of sales contributes to covering fixed costs and generating profit.

The formula is simple:

Contribution Margin = (Revenue - Variable Costs) / Revenue

Variable costs include anything that scales with each additional customer or unit sold. For a SaaS business, that means hosting, payment processing, customer success headcount that grows with the customer base, and onboarding costs. For an ecommerce brand, it includes cost of goods sold, shipping, fulfillment, and paid advertising spend.

Fixed costs like engineering salaries, office rent, and G&A are excluded. Those do not change when you add one more customer.

The key distinction from gross margin is that contribution margin includes variable operating expenses, not just cost of goods sold. Gross margin stops at COGS. Contribution margin goes one step further, subtracting the operating costs that scale with revenue.

Contribution Margin vs. Gross Margin

The confusion between these two metrics is the most common unit economics error founders make. Here is how they differ:

The practical impact is significant. A SaaS company reporting 80 percent gross margin might have a 55 percent contribution margin once you account for customer success teams, Stripe fees, and onboarding labor. That difference changes your CAC payback period from 12 months to 18 months, and it changes how much you can afford to spend on acquisition.

Bessemer Venture Partners noted in their 2025 portfolio benchmark that pure-play SaaS companies at Series B should target 80 to 90 percent contribution margin. Companies reporting gross margin instead of contribution margin are not comparing apples to apples with those benchmarks.

What Is a Good Contribution Margin

The answer depends entirely on your business model. A 65 percent contribution margin is strong for a marketplace but weak for a self-serve SaaS product. Here are the 2025 benchmarks by model:

The SaaS benchmarks come from OpenView's 2025 SaaS Benchmarks report, which surveyed 519 companies between $5 million and $20 million in annual recurring revenue. The Bessemer figures come from their 2025 portfolio review covering Series B and later companies.

DTC Ecommerce Is Different

DTC contribution margins look low compared to software, but the comparison is misleading. A DTC brand at $5M to $50M in gross merchandise value has a median contribution margin of 22 percent after advertising, according to Shopify merchant data from 2025. That is considered healthy for the category.

Below 15 percent, a DTC brand cannot fund growth from operations. Every dollar spent on ads returns less than the contribution needed to cover fixed costs, meaning the business requires outside capital to scale. This is the threshold where investors start asking hard questions about whether the unit economics work at all.

SaaS Delivery Model Matters

Within SaaS, the go-to-market model drives the benchmark. A product-led growth company selling to small businesses through self-serve can target 65 to 80 percent contribution margin because customer acquisition and onboarding costs are low. An enterprise SaaS company with a high-touch sales motion and dedicated customer success teams will land at 40 to 55 percent, and that is acceptable if contract values are large enough to absorb the higher cost to serve.

Step-by-Step Calculation Example

Consider a mid-market SaaS company with $8.4 million in annual revenue. Here is their cost structure:

Revenue: $8,400,000

Variable costs:

• Cloud hosting and infrastructure: $672,000 (8.0% of revenue)
• Payment processing (Stripe): $252,000 (3.0% of revenue)
• Customer success team (scales with customer count): $1,008,000 (12.0% of revenue)
• Onboarding and implementation: $420,000 (5.0% of revenue)
• Variable marketing spend (retargeting, lifecycle): $336,000 (4.0% of revenue)

Total variable costs: $2,688,000 (32.0% of revenue)

Contribution margin: ($8,400,000 - $2,688,000) / $8,400,000 = 68.0%

This company's gross margin, which excludes customer success, onboarding, and variable marketing, would be 89.0 percent. That is the number they might report to investors who do not ask follow-up questions. The real contribution margin of 68 percent places them in the mid-market SaaS range, which is solid but not exceptional.

Common Mistakes

Using gross margin instead of contribution margin for CAC payback. CAC payback is calculated as CAC divided by contribution margin per customer. If you use gross margin, your payback period looks shorter than it is. A company with $15,000 CAC and 80 percent gross margin on $1,000 monthly revenue shows a 19-month payback. Using a 55 percent contribution margin, the payback stretches to 27 months.

Treating semi-variable costs as fixed. Customer success headcount is semi-variable. You do not hire a new CSM for every single customer, but you do hire one when you add enough customers to justify the headcount. These costs belong in variable costs, not fixed costs. Excluding them inflates your contribution margin.

Not including payment processing. Stripe and PayPal fees scale directly with revenue. They are variable costs. A 3 percent processing fee on a $50,000 annual contract is $1,500 per year that should be subtracted from contribution.

Comparing across business models without context. A marketplace founder comparing their 45 percent contribution margin to a SaaS benchmark of 80 percent will think their business is broken. It is not. Marketplaces have fundamentally different cost structures, and 40 to 60 percent is the right range for that model.

Related Tools on ProfessionCalculators.com

To compare contribution margin against gross margin directly, the Gross Margin Calculator calculates the COGS-only metric so you can see the gap. For break-even analysis, the Break-Even Units Calculator uses contribution margin per unit to find the sales volume needed to cover fixed costs. To avoid confusing margin with markup, the Markup vs. Margin Calculator shows the difference. For broader profitability analysis, see our guides on how to calculate profit margin and the working capital ratio guide.

Frequently Asked Questions

What is a good contribution margin for SaaS?

For SaaS companies between $5 million and $20 million in ARR, the median contribution margin is 78 to 85 percent according to OpenView's 2025 benchmark of 519 companies. Pure-play SaaS at Series B should target 80 to 90 percent per Bessemer's 2025 data. Enterprise SaaS with high-touch sales will land lower, at 40 to 55 percent, which is normal for that go-to-market model.

How is contribution margin different from gross margin?

Gross margin subtracts only cost of goods sold from revenue. Contribution margin subtracts COGS plus all variable operating expenses, including customer success, payment processing, onboarding, and variable marketing. Gross margin is a GAAP metric used for investor reporting. Contribution margin is a unit economics metric used for pricing, CAC payback, and growth planning.

What contribution margin is too low?

For SaaS, anything below 40 percent suggests structural cost problems or pricing that is too low relative to the cost to serve. For DTC ecommerce, below 15 percent means the business cannot fund growth from operations and will require outside capital to scale. The threshold depends on your business model, so compare against the right benchmark, not a generic target.

Should I include customer success costs in contribution margin?

Yes, if those costs scale with your customer count. Customer success headcount is semi-variable, meaning you add headcount in increments as the customer base grows. These costs belong in variable costs because they increase with revenue. Excluding them inflates your contribution margin and understates your CAC payback period.

Can contribution margin be negative?

Yes. If variable costs exceed revenue for a product or customer segment, contribution margin is negative. This means every sale loses money before fixed costs are even considered. Negative contribution margin on a specific segment usually means you should either raise prices, reduce the cost to serve, or stop serving that segment entirely.

Conclusion

A good contribution margin is not one number. It is a range that depends on your business model, your go-to-market strategy, and how you define variable costs. The most important step is calculating it correctly in the first place. Start with revenue, subtract every cost that scales with each additional customer, and compare the result to the benchmark for your specific model. If you have been using gross margin, recalculate. The gap between the two is often 15 to 30 percentage points, and that gap changes every downstream metric from CAC payback to LTV to how much you can afford to spend on growth. Ready to find your number? The Contribution Margin Calculator walks through the formula with your revenue and variable costs.