A good LTV is relative, not absolute
LTV is the total value a customer generates over their relationship with you, and a good LTV is one that sits well above acquisition cost, commonly around three times CAC or better. The number alone means nothing. A ten-thousand-dollar LTV is excellent if the customer cost five hundred to acquire and terrible if they cost twelve thousand. This is why customer lifetime value is almost always judged as a ratio against customer acquisition cost, not as a standalone figure.Use gross profit, and mind the timing
Two things separate a meaningful LTV from a flattering one:
- Basis: gross-profit LTV reflects what the customer actually contributes after the cost to serve them. Revenue-based LTV overstates value, especially in thin-margin businesses. - Timing: a high LTV realized over many years still strains cash today. LTV has to be read next to the CAC payback period, which measures how fast the value returns.
A large lifetime value that arrives slowly, or is won at a punishing acquisition cost, can still describe an unprofitable, cash-hungry model.
The ratio is the real benchmark
The reference practitioners actually use is the LTV to CAC ratio, where roughly 3 to 1 is healthy, below 1 to 1 is underwater, and far above 5 to 1 often signals underinvestment in growth. These are conventions, not standards, and they vary by model and stage. What holds across all of them is that a good LTV is defined by its relationship to cost and time, not by its size. A company chasing a bigger LTV number without watching CAC and payback can grow its lifetime value and its losses at the same time, which is why the ratio, not the raw figure, is the number to manage.
Frequently Asked Questions
What is a good LTV?
There is no universal dollar figure, because LTV only means something relative to what it cost to acquire the customer. The practitioner reference is an LTV of roughly three times CAC or higher, which leaves enough margin above acquisition cost to fund growth and profit. A high absolute LTV with an even higher CAC is still a losing model, so the ratio matters more than the number.
Should LTV use revenue or gross profit?
Gross profit is the more honest basis, because it reflects what the customer actually contributes after the cost of serving them. Revenue-based LTV overstates value by ignoring delivery costs, which can make thin-margin businesses look healthier than they are. Serious LTV to CAC analysis uses gross-profit LTV.
Why can a high LTV still be a problem?
Because LTV says nothing about timing or acquisition cost on its own. A high LTV realized slowly, or won at a very high CAC, can still strain cash and margins. LTV has to be read alongside CAC and payback period, since a strong lifetime value that takes years to materialize does not pay this year's bills.
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