Blended CAC Calculator

Calculate blended customer acquisition cost across all channels and compare it against paid-only CAC, revealing how much organic acquisition is subsidising your paid numbers.

🎯 Marketing📐 Blended CAC = total S&M spend / total new customers💼 Business
Total sales & marketing spend
Total new customers acquired
Paid channel spend
Customers from paid channels
Please enter valid values.

Formula & Reference

VariableSymbolFormulaUnits
Blended CAC Calculator—Blended CAC = total S&M spend / total new customerscurrency per customer

Step-by-Step Examples

Example 1
Organic Subsidising Paid

Total S&M 60,000, 400 customers; paid spend 45,000 producing 220 customers.

  • Blended CAC = 60,000 / 400 = 150.00
  • Paid CAC = 45,000 / 220 = 204.55
  • Organic = 180 customers from 15,000 non-paid spend = 83.33
  • Paid CAC is 36% above blended
✓ Blended 150.00, paid 204.55
Example 2
Mostly Paid

Total S&M 80,000, 300 customers; paid 75,000 producing 280.

  • Blended CAC = 266.67
  • Paid CAC = 75,000 / 280 = 267.86
  • Nearly identical — little organic contribution to mask
✓ Blended 266.67, paid 267.86
Example 3
Heavily Organic

Total S&M 30,000, 500 customers; paid 20,000 producing 100.

  • Blended CAC = 60.00
  • Paid CAC = 20,000 / 100 = 200.00
  • Organic 400 customers from 10,000 = 25.00
  • Blended CAC looks excellent but paid economics are three times worse
✓ Blended 60.00, paid 200.00

Real-World Applications

🔍
Honest Unit Economics
Blended CAC flatters paid performance whenever organic acquisition is meaningful. Separating them shows what growth actually costs.
📈
Scaling Decisions
Organic volume rarely scales with budget, so incremental growth costs paid CAC — not blended.
💰
Investor Reporting
Sophisticated investors ask for both figures precisely because the gap between them is informative.
🎯
Channel Allocation
Channel-level CAC shows where incremental budget produces the best return.

Common Mistakes to Avoid

⚠️
Reporting only blended CAC

It systematically understates the cost of incremental growth, since organic customers would arrive with or without the marketing spend.

⚠️
Excluding salaries from S&M spend

CAC should include the fully loaded cost of sales and marketing staff, not just media spend. Omitting headcount can halve the apparent figure.

⚠️
Attributing all organic to zero cost

Content, SEO, and brand work drive organic acquisition and cost real money. Those costs belong somewhere in the calculation.

Frequently Asked Questions

What is blended CAC? ▾
Total sales and marketing spend divided by all new customers acquired, regardless of channel — including those who arrived organically.
How does it differ from paid CAC? ▾
Paid CAC counts only paid spend against customers acquired through paid channels, giving the true cost of buying incremental growth.
Which should I use for planning? ▾
Paid CAC for scaling decisions, since that is what additional budget will actually cost. Blended CAC is useful for understanding overall efficiency.
Should salaries be included in CAC? ▾
Yes. Fully loaded sales and marketing costs including headcount, tools, and agency fees give the accurate figure. Media-only CAC understates significantly.
Why does the gap between blended and paid matter? ▾
A large gap means organic acquisition is carrying your numbers. If organic plateaus, blended CAC will rise toward paid CAC and unit economics will deteriorate.

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