LTV to CAC Ratio

What LTV:CAC actually means

The LTV to CAC ratio compresses the entire growth engine into one number. It answers whether the business creates more value than it spends to buy that value. Because it is a ratio of two estimates, it inherits every weakness of both. A ratio built from revenue-based LTV and ad-spend-only CAC can be off by a factor of five, and it will always be wrong in the flattering direction.

Worked example

A company with a 2,250 dollar LTV and a 750 dollar CAC reports a ratio of 3.0. If finance recalculates LTV on gross profit and adds salaries to CAC, the same business lands at 1,700 divided by 1,150, or 1.5. Nothing about the business changed. Only the honesty of the inputs did.

Why the board cares

Boards use this ratio as the fastest read on whether to fund growth. Roughly 3.0 is the conventional target: below 1.0 the company destroys value with every sale, and above 5.0 it is usually underinvesting and leaving growth on the table. It is also the standard opening question in diligence, so the definition should be written down before anyone asks for it.

Benchmarks and rules of thumb

Around 3.0 is the widely cited healthy target for subscription businesses. Treat it as a conversation starter rather than a law, and always pair it with payback period, because a 3.0 that takes four years to realize is not the same business as a 3.0 that pays back in nine months.

Common mistakes

• Comparing an LTV built on revenue against a CAC built on ad spend, which double-flatters the ratio.
• Improving the ratio by cutting spend, which makes the number look better while shrinking the company.
• Presenting the ratio without payback period, hiding the cash timing that decides whether growth is fundable.

Related terms

• Customer Lifetime Value (LTV)
• Customer Acquisition Cost (CAC)
• CAC Payback Period
• Contribution Margin

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