What Is Customer Acquisition Cost (CAC)?
Customer acquisition cost (CAC) is the total cost of acquiring a new paying customer, including all marketing, advertising, and sales expenses. It is one of the most important financial metrics for evaluating whether a business's growth strategy is sustainable.
How Customer Acquisition Cost (CAC) Works
CAC is calculated as: Total Sales and Marketing Costs / Number of New Customers Acquired over a specific time period. If a company spends $50,000 on marketing and sales in a quarter and acquires 500 new customers, the CAC is $100.
For social media marketers, CAC encompasses the full cost chain: ad spend, content creation, tools and software, agency fees, and team salaries allocated to customer acquisition. HubSpot's CAC guide emphasizes that many businesses underestimate CAC by only counting ad spend and ignoring labor and tool costs.
CAC varies dramatically by channel and business model:
- E-commerce (social ads): $10-50 CAC is typical for impulse purchases; $50-200 for considered purchases
- SaaS: $100-500 for self-serve products; $500-5,000+ for enterprise sales
- D2C brands: $20-100, heavily influenced by retargeting efficiency and organic social presence
Track CAC by channel to understand which platforms deliver customers most efficiently. UTM-tagged links combined with conversion tracking let you attribute customers to specific social platforms and campaigns.
Why Customer Acquisition Cost (CAC) Matters for Social Media
Social media is both a paid and organic customer acquisition channel. The paid side is straightforward to measure: ad spend divided by customers acquired through ads. The organic side is harder but equally important — your content creation costs, community management time, and tool subscriptions all contribute to organic CAC.
The relationship between CAC and lifetime value (LTV) determines business viability. The widely cited benchmark is an LTV:CAC ratio of at least 3:1 — meaning each customer should generate at least 3x their acquisition cost in lifetime revenue. Sprout Social's ROI research shows that social media typically delivers one of the lowest CACs among digital channels when organic and paid strategies work together.
Rising CAC is one of the most common challenges in social media advertising. As platforms mature and competition increases, ad costs trend upward. Brands that rely solely on paid acquisition face constantly escalating CAC, which is why investing in organic social content alongside paid campaigns is critical for long-term sustainability.
Customer Acquisition Cost (CAC) Examples in Action
A subscription box company spends $15,000/month on Instagram and Facebook ads, $3,000 on content creation, and $2,000 on social media tools. They acquire 400 new subscribers per month. Total CAC: ($15,000 + $3,000 + $2,000) / 400 = $50. With an average customer lifetime of 8 months at $35/month, their LTV is $280, giving them a healthy 5.6:1 LTV:CAC ratio.
A B2B software company spends $30,000/month across LinkedIn ads, content marketing, and sales outreach. They acquire 20 new customers per month at a CAC of $1,500. Their average contract value is $12,000 annually with 2.5-year retention, so LTV is $30,000 — a 20:1 LTV:CAC ratio, indicating they could afford to spend more on acquisition.
How to Reduce Customer Acquisition Cost (CAC)
Invest in organic social. Organic content has no marginal distribution cost. A strong content pillar strategy that drives consistent organic traffic reduces reliance on paid acquisition. Use a social media scheduler to maintain consistent organic posting across platforms.
Improve conversion rates. Lowering CAC isn't always about spending less — it's about converting more of the traffic you're already paying for. Optimize landing pages, test CTAs, and reduce friction in the signup process. Hootsuite's advertising insights show that a 1% improvement in conversion rate can reduce CAC by 15-20%.
Leverage referral and word-of-mouth. Customers acquired through referrals have near-zero CAC. Build referral programs and encourage user-generated content that attracts new customers organically.
Retarget warm audiences. Retargeting website visitors and engaged social followers costs significantly less than acquiring cold traffic. Layer custom audiences with lookalike audiences to reach new people who resemble your best customers.
Optimize multi-platform presence. Use cross-posting to expand reach across platforms without proportionally increasing content creation costs. Being present on multiple platforms also creates multiple touchpoints in the customer journey, reducing the spend needed per conversion.
Frequently Asked Questions
What is a good customer acquisition cost?▼
A good CAC depends on your customer lifetime value (LTV). The benchmark is an LTV:CAC ratio of at least 3:1. For e-commerce, CAC of $10-50 is typical for impulse buys. For SaaS, $100-500 for self-serve products is normal. The key is ensuring your CAC is sustainable relative to how much revenue each customer generates.
How do I calculate CAC for social media?▼
Add up all social media marketing costs (ad spend, content creation, tool subscriptions, team salaries allocated to social) for a period, then divide by the number of new customers acquired through social media during that same period. Use UTM parameters and conversion tracking to accurately attribute customers to social channels.
What is the difference between CAC and CPA?▼
CAC includes all sales and marketing costs divided by new customers. CPA (Cost Per Acquisition) typically refers to the ad platform cost per conversion action, which could be a purchase, signup, or other event. CAC is a business-wide metric; CPA is a campaign-level metric. CAC is always higher than CPA because it includes overhead costs.
Related Terms
Lifetime Value (LTV)
Lifetime value (LTV) is the total revenue a business can expect from a single customer over the entire duration of their relationship. It is the foundational metric for determining how much a company can afford to spend on acquiring new customers through social media and other channels.
ROI (Return on Investment)
ROI, or Return on Investment, measures the profitability of your social media efforts by comparing the revenue or value generated against the total cost of your campaigns.
Cost Per Acquisition (CPA)
Cost per acquisition (CPA) is a marketing metric that measures the total cost of acquiring one paying customer through a specific channel or campaign. Calculated by dividing total campaign spend by the number of conversions, CPA is the definitive metric for evaluating the profitability of social media advertising and influencer marketing campaigns.
Conversion Rate
Conversion rate is the percentage of users who take a desired action after interacting with your social media content or ad, such as making a purchase, signing up, or downloading a resource.
ROAS (Return on Ad Spend)
ROAS (Return on Ad Spend) is a marketing metric that measures the revenue generated for every dollar spent on advertising. Calculated as revenue divided by ad spend, a ROAS of 4x means every $1 spent returned $4 in revenue. It is the primary efficiency metric for paid social media campaigns.
Related Tools
Stop reading about Customer Acquisition Cost (CAC). Start doing it.
Schedule posts, create content with AI, and grow your audience across 7 platforms — all from one dashboard.
7-day free trial · Cancel anytime