Customer Acquisition Cost (CAC)

Total cost to acquire a paying customer.

CAC = (Sales + Marketing costs) / New customers acquired

What it measures

Total cost to acquire a new paying customer, including marketing spend, sales salaries, tools, and overhead allocated to acquisition. Note: no standardized calculation method exists—companies calculate CAC differently, making benchmarking imprecise.

Calculation methods

Paid CAC: Ad spend / New customers via paid channels. Best for measuring channel efficiency and optimizing specific acquisition campaigns.
Blended CAC: Total acquisition cost / Total new customers. Best for measuring overall business health and unit economics across all channels.

Benchmarks

SaaS (Overall): $702 average
Fintech: $1,450 average
E-commerce: $274 average

What to watch

Falling: Acquisition is more efficient, but verify quality. Cheaper customers may churn faster or spend less. Pair with LTV to ensure you're not sacrificing long-term value.
Rising: Competition is intensifying, or you've saturated easy-to-reach audiences. Segment by channel, as some channels scale poorly. If LTV rises faster than CAC, rising costs can still be profitable.

In practice

A SaaS company saw paid search CAC rise from $120 to $180 over six months as competition increased. Content marketing CAC was $95 but took 6 months to show results. They maintained paid search for immediate pipeline while investing in content for long-term CAC reduction. Blended CAC stabilized at $135.