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Calculate your LTV:CAC ratio
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What Is the LTV-to-CAC Ratio?
The LTV-to-CAC ratio compares the estimated gross profit generated by an average customer during the relationship with the fully loaded cost of acquiring that customer. It helps assess whether customer value reasonably supports sales and marketing investment.
LTV-to-CAC Ratio Formula
For example, an LTV of $3,000 and CAC of $1,000 produces a 3:1 ratio. That means the estimated lifetime value is three times the acquisition cost. It does not mean the business earns three dollars of immediate cash profit for every dollar spent.
Optional SaaS LTV estimate
The simple SaaS model assumes stable ARPA, gross margin, and customer churn. Use a cohort or predictive LTV model when customer behavior changes materially over time.
Use Consistent Inputs
Customer lifetime value
Use a gross-margin-adjusted LTV when possible. Comparing revenue-only LTV with a fully loaded CAC can make acquisition economics appear stronger than they are.
Customer acquisition cost
Fully loaded CAC normally includes the sales and marketing costs that contributed to acquiring new customers, such as salaries, commissions, advertising, tools, agencies, and relevant overhead, divided by new customers acquired in the same period.
Customer segment and period
Do not compare enterprise LTV with blended CAC or one quarter’s CAC with a lifetime value calculated from a different customer population. Segment both measures consistently by plan, region, channel, or customer type when those groups behave differently.
How to Interpret the Ratio
A 3:1 LTV:CAC ratio is a frequently cited SaaS reference point, but it is not a universal pass-or-fail threshold. A ratio below the selected target may indicate high acquisition cost, weak retention, low pricing, or low gross margin. A very high ratio can indicate efficient acquisition, but it can also suggest that the business may be underinvesting in growth.
Review the ratio with CAC payback, cash runway, net revenue retention, contribution margin, sales cycle, customer concentration, and the uncertainty in the LTV estimate.
Important Limitations
The ratio is only as reliable as its inputs. Averages can hide unprofitable channels or customer segments. The simplified LTV formula does not model expansion, contraction, discount rates, changing churn, or customer-level survival curves. The calculator is a planning tool and does not determine profitability on its own.
Frequently Asked Questions
How do you calculate the LTV-to-CAC ratio?
Divide customer lifetime value by customer acquisition cost. An LTV of $3,000 divided by CAC of $1,000 equals 3, usually written as 3:1.
Is 3:1 always a good LTV-to-CAC ratio?
No. It is a common SaaS reference point, but the appropriate target depends on business stage, gross margin, capital efficiency, payback period, retention, and growth strategy.
Should LTV include gross margin?
For unit-economics analysis, a gross-margin-adjusted LTV provides a more consistent comparison with acquisition cost than revenue-only LTV.
What costs should CAC include?
Use the sales and marketing costs that contributed to acquiring customers, including relevant salaries, commissions, advertising, software, agencies, and overhead, divided by new customers acquired in the same period.
Can a high LTV:CAC ratio be a problem?
A high ratio can reflect strong economics, but it may also mean the business is investing too cautiously in acquisition. Interpret it with growth rate, payback period, market size, and available capital.
Should I calculate one ratio for the whole business?
A blended ratio is useful for a summary, but segment-level ratios by channel, plan, region, or customer type usually provide better decisions.
Methodology Sources
The formulas and definitions were checked against ChartMogul’s LTV methodology, ChartMogul’s CAC definition, Stripe’s LTV:CAC and payback guidance, and Paddle’s LTV:CAC methodology.