Customer Acquisition Cost (CAC) Calculator 2026

A LTV:CAC ratio of 3× or above is the benchmark for SaaS and subscription businesses — meaning each customer generates 3× the cost to acquire them over their lifetime. Below 1× means you lose money on each customer. 1–3× means you are marginally profitable but likely underfunding growth. Above 5× suggests underinvestment in acquisition — you may be leaving growth on the table. Ratios above 10× often indicate very conservative marketing spend relative to unit economics potential.

Both are valuable but for different purposes. Blended CAC (total S&M ÷ total new customers) gives a simple overall health check. Channel-level CAC reveals which channels are most efficient and where to reallocate budget. The risk of blended CAC is that a highly efficient organic/SEO channel can mask an inefficient paid channel. Multi-touch attribution is ideal but complex — many companies use last-touch attribution as a pragmatic approximation.

Fully loaded CAC includes: all sales and marketing salaries plus employer NI and pension (pro-rated for their S&M focus), marketing technology subscriptions (CRM, automation, analytics), paid advertising spend, agency and contractor fees, events and trade shows, content production costs, and SDR/BDR salaries. Excluding salaries (using only media spend) dramatically underestimates true CAC and leads to poor investment decisions.