LTV:CAC

LTV:CAC is whether the customers you acquire are worth more than what you paid to acquire them. It's the single most important unit economic for paid advertising businesses. Below 3:1 you're fragile; above 5:1 you can scale profitably.

Definitions

LTV (Lifetime Value)

Total gross profit a customer generates over their relationship with you.

LTV = Gross profit per customer × years as customer

CAC (Customer Acquisition Cost)

Total cost to acquire one customer, including ad spend + any associated costs.

CAC = Total ad spend / Customers acquired

Target ratios by business type

• DTC single-purchase: 3:1 minimum, 5:1 healthy
• DTC subscription: 4-10:1 range
• SaaS: 3:1 minimum, aim for 5:1+
• B2B high-ticket: 5-10:1
• Marketplace: variable; depends on take rate and repeat

Why 3:1 minimum

LTV is gross profit, not revenue. From 3x gross profit, you need to cover:

• Overhead, salaries, infrastructure
• Product development
• Non-ad marketing spend
• Profit/dividends

1:1 or 2:1 means you're paying for customers without leaving room for the business to exist.

Payback period

How quickly you recover CAC. Rule of thumb:

• Under 6 months: healthy
• 6-12 months: acceptable
• 12-24 months: risky (needs strong retention)
• 24+ months: break-even on acquisition, all profit from retention

Improving LTV:CAC

Reduce CAC

• Better creative → lower CPC, higher conversion
• Better landing pages
• Less expensive channels

Increase LTV

• Upsells and cross-sells
• Subscription (higher retention)
• Raise prices
• Reduce churn
• Expand offering

The segmentation reveal

Blended LTV:CAC often hides truth. Segment:

• By channel (Meta CAC vs Google CAC)
• By customer type
• By product/offer
• By cohort

Often some segments are 1.5:1 while others are 8:1. Shifting budget into the 8:1 segments is where growth comes from.