1. Estimate customer lifetime value
Monthly revenue per customer is adjusted by gross margin and divided by monthly churn to estimate the gross profit generated over a typical customer relationship.
Unit economics calculator
LTV-to-CAC Ratio Calculator
Measure how much customer value your business creates for every unit spent on acquisition. Calculate customer lifetime value, acquisition cost, ratio quality, and CAC payback period.
Instant results
Ratio benchmark
Payback period
Calculate your LTV-to-CAC ratio
Use figures from the same reporting period for a more meaningful comparison.
This calculator uses the simplified churn-based LTV model.
Cohort-based LTV may be more accurate for businesses with
changing retention, expansion revenue, or irregular
purchases.
How the LTV-to-CAC calculator works
The calculator connects retention, gross margin, revenue, and acquisition spending to show whether customer growth is economically sustainable.
2. Calculate acquisition cost
Total sales and marketing expenditure is divided by the number of newly acquired customers during the same period to calculate average CAC.
3. Compare value with cost
LTV is divided by CAC. The resulting ratio shows how much lifetime gross profit is expected for each unit invested in acquiring a customer.
LTV formula
LTV = (Monthly Revenue × Gross Margin)
÷ Monthly Churn Rate
CAC formula
CAC = Sales & Marketing Spend
÷ New Customers
Ratio formula
LTV-to-CAC Ratio = Customer LTV
÷ Customer CAC
Ratio
General signal
What it may indicate
Below 1:1
Unsustainable
Acquisition cost exceeds expected customer value, so each new customer may destroy value.
1:1–3:1
Needs improvement
Growth may be viable, but margins, retention, pricing, or acquisition-channel efficiency likely need attention.
3:1–5:1
Healthy range
Customer value generally provides a useful cushion over acquisition cost, depending on cash flow and industry.
Above 5:1
Possible opportunity
Economics are strong, although the business may be underinvesting in scalable acquisition or growth.
Frequently asked questions
Key points to consider when using LTV, CAC, churn, and payback metrics.
What is the LTV-to-CAC ratio?
The LTV-to-CAC ratio compares the estimated gross-margin-adjusted lifetime value of a customer with the average cost required to acquire that customer. A 3:1 ratio means the expected customer value is three times the acquisition cost.
What is considered a good LTV-to-CAC ratio?
A ratio near 3:1 is often treated as a healthy reference point, but the correct target depends on the business model, funding strategy, gross margin, cash flow, customer concentration, and payback period.
Why does the calculator use gross margin?
Revenue is not the same as economic value. Applying gross margin removes direct delivery costs and creates a more realistic estimate of the gross profit available to recover acquisition spending and support operating expenses.
How do I calculate monthly customer churn?
Divide the customers lost during the month by the customers active at the beginning of that month, and then multiply the result by 100. Do not mix customer churn with revenue churn because they measure different things.
What expenses should be included in CAC?
Include sales and marketing costs required to acquire customers, such as paid advertising, agency fees, sales salaries and commissions, marketing software, creative production, events, and other directly related acquisition expenses.
What is the CAC payback period?
The CAC payback period estimates how many months of gross profit from a customer are required to recover the acquisition cost. A shorter payback period normally improves cash efficiency and makes growth easier to finance.
Can ecommerce businesses use this calculator?
Yes, but a cohort-based model may be more appropriate. Ecommerce businesses can use average order value, purchase frequency, contribution margin, and expected customer lifespan when repeat purchases are irregular.
How often should I review this ratio?
Review the ratio monthly or quarterly and compare customer cohorts, segments, and acquisition channels. A blended company-wide ratio can hide weak channels or high-value segments.