Customer Acquisition & Growth Lab

CAC by Channel & Marketing Mix Lab

Calculate customer acquisition cost (CAC) by channel, blended CAC, channel LTV:CAC ratios, payback periods, and marketing budget reallocation efficiency.

Marketing Mix Engine Channel Performance Table Unit Economics Theory FAQ

Business Models

Load benchmark channel marketing mixes.

Step 1: Enter Channel Spend, Overhead & Customer Volume

Marketing Mix & Channel Spend Inputs

Used to calculate net gross margin contribution for payback.
Average Revenue Per User per month.

🔍 1. Paid Search (Google Ads / SEM)

📱 2. Paid Social (Meta / LinkedIn / TikTok)

✍️ 3. Organic SEO & Content

💼 4. Outbound Sales & SDRs

🤝 5. Partners & Referrals

Blended Portfolio CAC
$474.19
Total Monthly Spend: $73,500
Blended LTV:CAC Ratio
6.77x
Portfolio Avg LTV: $3,212
Total Customers Won
155
Across 5 Acquisition Channels
Blended CAC Payback
4.1 Mo
At 78% Margin & $150 ARPU

Channel Unit Economics & Capital Efficiency Table

Detailed cost per acquisition, customer value ratios, and strategic scaling recommendations for each marketing channel.

Channel Total Spend Customers Channel CAC Channel LTV LTV:CAC Payback Status & Action

Growth Marketing Economics

Principles of Channel Economics

Key drivers in marketing mix optimization:

  • Fully Loaded CAC: Includes agency retainers, creative production, ad tech licenses, and sales salaries alongside direct media ad spend.
  • The Blended CAC Trap: A healthy blended CAC often obscures individual money-losing channels. Every channel must stand on its own unit economics.
  • Diminishing Marginal Returns: Scaling ad spend in saturated channels increases marginal CAC; high LTV:CAC channels should receive reallocated capital.
  • Payback Velocity: A 12-month CAC payback allows rapid cash recycling and compounding reinvestment.

Track cohort churn in the Cohort Retention Lab.

Mathematical Formulation

CAC & marketing mix formulas

CAC_i = ( Direct_Spend_i + Overhead_i ) ÷ Customers_i

LTV_to_CAC_i = LTV_i ÷ CAC_i

Payback_Months_i = CAC_i ÷ [ ARPU × (Gross_Margin / 100) ]

Blended_CAC = ∑(Total_Spend_i) ÷ ∑(Customers_i)

Blended_LTV = ∑(LTV_i × Customers_i) ÷ ∑(Customers_i)

Model viral expansion in the Viral Coefficient Lab.

FAQ

Customer acquisition cost questions

What is CAC by Channel?

CAC by Channel measures the exact cost of acquiring a new customer through a specific marketing channel (e.g. Paid Search, Paid Social, SEO, Outbound SDRs), factoring in both direct media spend and indirect overhead such as agency fees, creative production, and software tools.

Why is blended CAC dangerous for scaling companies?

Blended CAC hides underperforming, highly expensive channels behind organic or referral traffic. While total blended CAC may look acceptable, individual paid channels might be burning cash with an LTV:CAC below 1.0x.

What is a healthy LTV:CAC ratio?

A healthy target LTV:CAC ratio is between 3.0x and 5.0x. A ratio below 3.0x indicates unsustainable acquisition costs, while a ratio above 5.0x indicates under-investment and room to aggressively scale marketing spend.

How is CAC payback period calculated?

CAC payback period is calculated as Channel CAC divided by Monthly Gross Margin Contribution (Monthly ARPU * Gross Margin %). It measures how many months of customer revenue are required to fully recover acquisition spend.

Can I export the channel marketing audit to CSV?

Yes. You can export complete channel spend, customer acquisition numbers, CAC, LTV:CAC ratios, and payback audits as a UTF-8 CSV spreadsheet with formula defense.

Continue Exploring Marketing & Demand Tools

Explore our Marketing & Demand Hub, model retention decay in the Cohort Retention Lab, calculate viral loops in the Viral Coefficient Lab, measure customer segmentation in the RFM Segmentation Lab, or evaluate multi-touch campaigns in the Marketing Attribution Lab.