Blended CAC (Customer Acquisition Cost)
1. Definition
- CAC (Customer Acquisition Cost): how much it costs to acquire one new customer.
- Blended CAC: the average CAC across all channels (paid + organic), without separating by source.
It’s called blended because it mixes both paid marketing costs (ads, campaigns, sales spend) and organic efforts (SEO, referrals, inbound, brand).
2. Formula
$\text{Blended CAC} = \frac{\text{Total Sales \& Marketing Spend}}{\text{Total New Customers Acquired}}$
Where:
- Numerator: ad spend, salaries of sales/marketing, software tools, creative costs, etc.
- Denominator: all new customers in the same period, no matter the source.
3. Example
- Sales & Marketing Spend (1 month): $100,000
- New Customers Acquired: 2,000
$\text{Blended CAC} = \frac{100{,}000}{2{,}000} = \$50 \text{ per customer}$
4. Why It’s Useful
- Simple, high-level snapshot of efficiency.
- Easy to calculate and compare over time.
- Reflects the true “all-in” cost per customer, not just paid ads.
5. Limitations
- Masks differences between channels.
- Example: Paid search CAC = \$150, organic referral CAC = \$10 → blended looks like \$50, but hides inefficiency.
- Not great for optimization decisions (you don’t know which channel drives value).
- Can be misleading if you scale paid ads aggressively (blended CAC will rise).
6. Related Metrics
- Paid CAC: only counts paid marketing costs / paid-acquired customers.
- Organic CAC: counts non-paid channels.
- LTV:CAC ratio: compares customer lifetime value with acquisition cost → key for business sustainability.
Summary (easy version):
Blended CAC = total sales & marketing spend ÷ total new customers.
It’s a quick, high-level metric that shows overall efficiency, but it hides channel differences — so use it for big-picture health, not detailed optimization.