For subscription businesses, customer lifetime value is a product of what a customer pays, the gross profit left after serving them, and how long they remain a customer. A common steady-state estimate is gross-profit LTV ≈ ARPU × gross margin ÷ customer churn. The calculation is useful only when its time periods, cost boundaries, and churn definition match—and when its assumptions fit the customers being measured.
How do you calculate customer lifetime value for a subscription business?
A widely used shortcut estimates the gross profit expected from a customer over an average lifetime:
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Gross-profit LTV ≈ average revenue per customer per period × gross margin ÷ customer churn rate for that same period
For example, with monthly ARPU of $100, an 80% gross margin, and monthly customer churn of 4%, the estimate is $2,000: $100 × 0.80 ÷ 0.04. This is an illustrative calculation, not an industry benchmark. The inverse of 4% monthly churn also implies an expected lifetime of 25 months under the shortcut’s stable-churn assumption.
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- Keep the period consistent: monthly ARPU goes with monthly churn; annual revenue goes with annual churn. Do not combine a monthly revenue figure with an annual churn rate.
- Label the value being measured: revenue LTV counts subscription revenue; gross-profit LTV subtracts the direct costs of serving customers.
- State the population: specify the customer cohort, segment, or period used to calculate ARPU, margin, and churn.
The shortcut is most defensible when revenue, margin, and churn are reasonably stable for the customers in question. For a fuller treatment of subscription churn and sensitivity analysis, see the 2017 paper A generalized Bayesian framework for the analysis of subscription based businesses.
Use cohort LTV when customer behavior changes over time
A cohort method estimates gross profit period by period, weighting each period by the share of the original cohort still active. It can show how retention changes with tenure and account for expansion, contraction, or changing churn. Historical cohorts help calibrate projections, but projected future value is still an estimate, not observed profit.
Should LTV use revenue or gross profit?
Use gross-profit LTV when assessing whether customer acquisition can pay for itself. A revenue-only estimate leaves out service costs and should not be presented as profit or compared with CAC without that qualification.
Define the gross-margin boundary consistently. Companies may classify hosting, payment processing, support, onboarding, and other direct service costs differently; disclose what is included rather than implying there is one universal accounting boundary. If the boundary changes between cohorts or segments, the comparison can mislead even when the formula is unchanged.
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Why does churn change LTV so much?
Churn sits in the denominator: with revenue and margin held constant, a lower churn rate raises the shortcut estimate, sometimes sharply. But one average churn rate can hide important differences. Early-life cancellations, tenure effects, seasonality, product changes, and customer mix can all make a stable-rate assumption inaccurate.
Check whether “churn” means lost customers (logo or customer churn), lost recurring revenue (gross revenue churn), or a measure that includes expansion, such as net revenue retention. These measures are not interchangeable. A customer-count churn rate is not automatically compatible with a revenue-retention formula.
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How should you compare LTV with CAC?
CAC is acquisition spending divided by the new customers acquired over a defined period. Set the spending boundary and acquired-customer population explicitly, including how sales costs as well as marketing are allocated. Oracle NetSuite describes this definition and defines CAC payback as the time required for gross profit to recover acquisition cost in its unit economics KPI guide.
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| Measure | What it tells you | What to check |
|---|---|---|
| LTV:CAC | Estimated lifetime gross profit relative to acquisition cost. | Use the same cohort, customer segment, and cost boundaries for both sides. |
| CAC payback | How long gross profit takes to repay acquisition cost. | Consider the time to recovery, not just the eventual lifetime estimate. |
| Gross margin and retention by cohort or segment | The underlying drivers and quality checks behind the estimate. | Look for cohort age, retention shape, cost treatment, and segment differences. |
A strong ratio alone does not establish that growth is cash-efficient: payback may be slow, cohorts may be immature, or the customer base may be too small to support the assumptions. AWS recommends deriving LTV:CAC from the same cohorts used for retention analysis and segmenting the ratio to identify profitable customers in its SaaS growth metrics guide. Compare channels and segments using consistent formulas and cost allocations.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What is a good LTV to CAC ratio for SaaS?
There is no single ratio that applies to every SaaS company, growth stage, or calculation method. The following figures are attributed guidance or sample results, not universal pass marks:
| Publisher and basis | Figure | How to interpret it |
|---|---|---|
| Amazon Web Services; undated guidance surfaced in 2026 | 3:1 LTV:CAC | AWS describes this as a healthy target and notes that investors prioritize unit economics differently at different growth stages. |
| Updata Partners; publication date not established in the search result | “Good”: gross-margin payback under 18 months and rCAC above 3×; “great”: under 12 months and above 5× | These are Updata’s framework thresholds, not measured outcomes for all SaaS companies. Updata defines GMPP as “the number of months required to break even on the cost of acquiring a customer.” |
| Pavilion, 2024 B2B SaaS Performance Metrics Benchmarks Report; FY23 sample | Median CLTV:CAC 3.6; 25th percentile 2.3; 75th percentile 6.0 | These describe the report’s B2B SaaS sample and fiscal-year definition, not subscription businesses generally. |
Sources: AWS SaaS growth metrics guide, Updata Partners SaaS Metrics Framework, and Pavilion’s 2024 report.
How do gross revenue retention and churn-based formulas differ?
Pavilion’s report presents a gross-margin-adjusted CLTV approach based on ARPA and subscription gross margin divided by one minus gross revenue retention, and recommends calculating at the segment level. That denominator is not automatically equivalent to customer churn. Gross revenue retention tracks recurring revenue retained before expansion, whereas customer churn tracks customers lost; their formulas should be compared only when the definitions and periods align.
Before comparing a published benchmark or another company’s LTV:CAC with your own, check the measurement choices that can change the result:
Quick Recap
- Revenue LTV or gross-profit LTV.
- Monthly or annual measurement period, with a corresponding churn basis.
- Customer churn, gross revenue churn, or a retention measure that includes expansion.
- Cohort age and retention curve, including expansion, contraction, and downgrades.
- Gross-margin costs included and CAC spending allocated.
- LTV:CAC considered alongside payback time and cash constraints.
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