LTV is the total value you expect from a customer over their lifetime; CAC is what you spend to acquire them. They're not opposites—they work together. A healthy business keeps LTV meaningfully higher than CAC (e.g. LTV:CAC ≥ 3:1) and recovers CAC within a reasonable payback period.
What is LTV (Customer Lifetime Value)?
Customer lifetime value (LTV) is the total revenue or profit you expect from one customer over the entire time they do business with you. It answers: “How much is this customer worth?” Formula: LTV = Average Order Value × Purchase Frequency × Customer Lifespan × Gross Margin %. The higher your LTV, the more you can sensibly spend to acquire similar customers. See our guide What is Customer Lifetime Value (LTV)? and use our free LTV Calculator to model your numbers.
What is CAC (Customer Acquisition Cost)?
Customer acquisition cost (CAC) is the total cost of acquiring one new customer—typically total marketing and sales spend in a period divided by the number of new customers in that period. It answers: “How much did we pay to get this customer?” Lower CAC is better, but only if the customers you acquire are valuable (high LTV). Optimizing for cheap CAC alone can attract low-value customers.
Why LTV vs CAC Matters
LTV and CAC together define your unit economics. If CAC is higher than the profit you make from a customer (or if payback takes too long), growth is unsustainable. A common rule of thumb: LTV:CAC ≥ 3:1 and payback period under 12 months. That gives room for scale and margin. Use our LTV Calculator to see your LTV:CAC ratio and payback, and our ROI Calculator to tie acquisition spend to revenue.
How to Improve LTV and CAC
To improve LTV: increase retention (fewer churn, more repeat purchases), raise AOV (bundles, upsells), or increase purchase frequency (email, loyalty). To improve CAC: improve targeting and creative so you pay less per conversion, and improve conversion rate so each dollar of spend acquires more customers. For product-level profitability and pricing, use our Product Profitability Analyzer and Pricing & Bundling Simulator. For more on cost of growth, read Cost of Growth: What It Is and How to Measure It.
FAQ
- What is the difference between LTV and CAC?
- LTV (customer lifetime value) is the total revenue or profit you expect from one customer over their relationship with you. CAC (customer acquisition cost) is what you spend to acquire that customer. They work together: you want LTV to be meaningfully higher than CAC (e.g. LTV:CAC ≥ 3:1).
- What is a good LTV to CAC ratio?
- A common benchmark is 3:1 or higher—each customer is worth at least three times what you spent to acquire them. Below 3:1 can still be profitable but leaves less room for scale; above 5:1 is often considered strong. Use our free LTV Calculator to model your ratio.
- How do you improve LTV and CAC?
- Improve LTV by increasing retention, AOV, or purchase frequency. Improve CAC by better targeting, creative, and conversion so you pay less per acquired customer. Measure both with our LTV Calculator and Product Profitability Analyzer.