LTV to CAC Ratio
What is LTV to CAC Ratio?
LTV to CAC Ratio compares customer lifetime value against customer acquisition cost to evaluate acquisition efficiency.
LTV/CAC compares modeled customer value with acquisition cost. It helps compare acquisition choices only when both inputs describe the same kind of customer and use compatible definitions. A precise ratio built from an uncertain lifetime estimate still has substantial uncertainty.
Also known as: LTV/CAC, LTV:CAC
Formula
LTV:CAC Ratio = LTV / CAC | Variable | Meaning |
|---|---|
CAC | Customer acquisition cost. |
LTV | Customer lifetime value. |
How to use it
- Choose revenue LTV or gross profit LTV, label it, and keep that definition consistent across comparisons.
- Match the LTV cohort or segment to the CAC cost pool. Separate enterprise sales from self-service acquisition if their economics differ.
- Divide LTV by CAC and show a conservative alternative using shorter retention or lower margin. Add payback months so the timing of recovery remains visible.
Worked example
Hypothetical worked scenario
A fictional team calculates $25,000 revenue LTV, an 80% gross margin, and $5,000 CAC. A second channel costs $3,000 per account but retains customers for less time.
First channel gross profit LTV = $25,000 × 80% = $20,000; ratio = $20,000 ÷ $5,000 = 4×. If the second channel’s gross profit LTV is $9,000, its ratio is 3×.
The lower CAC channel has the lower value-to-cost ratio in this scenario. The team still needs cash timing, scale, and uncertainty estimates before choosing a budget.
Calculate with your numbers
LTV:CAC Ratio = LTV / CAC | Variable | Meaning |
|---|---|
CAC | Customer acquisition cost. |
LTV | Customer lifetime value. |
Worked example
- LTV
- $30,000
- CAC
- $5,000
- → LTV:CAC Ratio
- 6
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Open the LTV to CAC Ratio calculator for a focused view of the inputs.
What the result tells you
Use the ratio to investigate acquisition quality, not as an automatic spending rule. A high result may reflect strong retention, but can also come from omitted acquisition costs or an optimistic lifetime model. Inspect the inputs and cohort evidence before treating the number as a signal to expand.
Assumptions and common mistakes
- A 3× revenue-based ratio is not equivalent to a 3× gross-profit-based ratio.
- LTV is modeled over a customer lifetime while CAC is incurred near acquisition; the ratio does not tell you when cash returns.
- A zero CAC makes the ratio undefined. Organic acquisition often has people and content costs even if advertising spend is zero.
Frequently asked questions
Does a 1× ratio mean break-even?
Under a gross profit LTV convention, it means modeled lifetime gross profit equals acquisition cost before other operating costs and discounting. It does not establish company profitability.
Why pair this ratio with payback?
Two channels can have the same lifetime ratio and very different recovery times. The slower channel can require much more cash to scale.
Sources and methodology
The references below explain the underlying methods. Our worked scenarios use hypothetical figures; they are not company results or current market benchmarks.
- Stripe: Customer lifetime value
Lifetime value methods and the role of gross margin.
- Bessemer: Scaling to $100 Million
Gross margin adjusted CAC payback and segment differences; historical research, not a current market benchmark.
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