Acquisition Metrics

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Customer Acquisition Cost (CAC)

Customer Acquisition Cost, or CAC, equals total sales and marketing spend divided by new customers acquired. For SMB SaaS, CAC under $300 is healthy. For e-commerce, under $45 is strong. The key benchmark is the LTV to CAC ratio — aim for 3 to 1 or higher.

Why CAC Matters

CAC determines whether your growth is sustainable or burning cash. A business with strong revenue but unsustainable CAC will run out of runway before reaching profitability. The LTV/CAC ratio, CAC payback period, and gross margin all depend directly on CAC. Investors scrutinize CAC because it reveals whether a company can scale efficiently — doubling spend should ideally less-than-double CAC as channels mature and brand builds.

How to Calculate CAC

Divide total sales and marketing spend (including salaries, tools, ad spend, commissions, and allocated overhead) by the number of new customers acquired in the same period. Use a consistent time window — monthly or quarterly.

CAC Formula

CAC = Total Sales & Marketing Spend ÷ New Customers Acquired

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Total S&M Spend

New Customers Acquired

CAC

$250

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Industry Benchmarks

Segment	Good	Average	Poor
Consumer App	<$25	$25–$75	>$75
E-Commerce	<$45	$45–$120	>$120
SMB SaaS	<$300	$300–$800	>$800
Enterprise SaaS	<$5,000	$5K–$15K	>$15K

Expert Tips

Always calculate fully loaded CAC — include sales salaries, tools, content production, and agency fees, not just ad spend. Blended CAC that only counts ad spend understates true acquisition cost by 30-60%.

Segment CAC by channel. Blended CAC masks that some channels (organic, referral) are nearly free while others (paid social, SEM) are expensive. Allocate budget to the most efficient channels first.

Track CAC payback period alongside CAC. A $500 CAC that pays back in 3 months is better than a $200 CAC that takes 18 months because of low ARPU.

Rising CAC is normal as you scale — the cheapest customers come first. Plan for 20-30% CAC inflation year-over-year and bake it into your financial model.

Frequently Asked Questions

What is CAC?

CAC (Customer Acquisition Cost) is the total sales and marketing spend required to acquire one new paying customer. It includes ad spend, salaries, tools, commissions, and any other cost directly tied to customer acquisition.

What is a good CAC for SaaS?

For SMB SaaS, CAC under $300 is strong. For mid-market, under $3,000 is healthy. For enterprise, $5,000-$15,000 is typical. The absolute number matters less than the LTV/CAC ratio — aim for 3:1 or higher.

How do I reduce CAC?

Focus on organic channels (SEO, content, referrals), improve conversion rates through better onboarding, optimize ad targeting, and build word-of-mouth through product quality. Each percentage point of conversion improvement directly reduces CAC.

Should I use blended or channel-specific CAC?

Both. Use blended CAC for overall business health and investor communication. Use channel-specific CAC for budget allocation decisions — it tells you which channels to invest more in and which to reduce.

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Business Models Using CAC

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