What is LTV to CAC Ratio?
By Lior Ronen | Founder, Finro Financial Consulting
The LTV (or CLV) and CAC are two critical KPIs. When combined, they're even more powerful.
The customer lifetime value (LTV or CLV) measures the value of customers over time.
It calculates how much loyal customers are worth to the business over the entire period of using its products or services.
The customer acquisition cost (CAC) measures how much a business spends (or invest) to acquire one new client.
When LTV and CAC are combined, we get a powerful ratio that tells us whether we generate enough revenue from each client to justify the cost of acquiring this client.
What is enough?
The rule of thumb is that the LTV should be at least 3x than the CAC, which means a customer should generate three times more revenues than in cost to acquire this customer in the first place.
Otherwise, it just doesn't worth it.
How to Calculate the LTV to CAC Ratio?
First, let’s start by calculating a startup’s CAC.
It's pretty simple. You divide the annual or monthly sales and marketing spend (including both payroll and non-payroll expenses) by the number of new customers you added in that specific period.
Let's look at an annual CAC, for example.
if you spent last year $100k on the payroll for sales and marketing, $50k on paid ads, and acquired 1,500 new clients, your annual CAC for that year is:
($100,000 + $50,000) / 1,500 = $100
Second, we’re moving on to calculate the LTV.
The most common and straightforward customer lifetime value calculation uses the Average Revenue Per User (ARPU) and the customer lifespan or the churn rate.
For the LTV or CLV calculation, we need to multiply the ARPU with the customer lifespan. Make sure that both items use the same time units. If you're using a monthly ARPU, use the customer lifetime in months, but use the customer time value in years if you're using an annual ARPU.
For example: if the ARPU of a particular business is $20 per month and the average customer lifespan is four years, so the LTV is $20 x 48 = $960.p
Third, let’s put the two figures together. The LTV to CAC ratio is $960 (the LTV) divided by $100 (The CAC) = 9.6x
What Does The LTV to CAC Ratio Mean?
That client generates $960 in revenues to the company when onboard, while the company spent $100 to acquire this client. So the LTV to CAC ratio is 9.6x, higher than the rule-of-thumb of the optimal 3x LTV to CAC ratio.
It means that the revenue a company generates from a single customer over its lifetime is worth the cost of acquiring this client.
Explore cash flow modeling for businesses: Understand cash flow vs. profitability, create dynamic financial models, and ensure long-term success.
earn what Average Order Value (AOV) is, how to calculate it, why it matters, strategies to increase AOV, and how AOV differs from ARPU.
Pre-money valuation explained for startups: learn the formula, dilution impact, investor ownership, valuation drivers, and why the highest valuation is not always best.
Burn rate explained for startups: learn gross burn, net burn, runway calculation, and why investors care about what startup spending produces.
CAC explained for startups: learn the customer acquisition cost formula, what costs to include, how CAC payback works, and why investors review CAC with LTV.
LTV explained for startups: learn the customer lifetime value formula, how churn and gross margin affect LTV, and why investors review LTV with CAC and payback.
Churn explained for startups: customer churn, revenue churn, gross churn, net churn, SaaS examples, and how churn affects financial models.
Cohort analysis explained for startups: how customer cohorts reveal retention, churn, revenue quality, LTV, and growth durability in financial models.
MRR explained for startups: definition, formula, calculation example, MRR movement, common mistakes, and how monthly recurring revenue supports financial modeling.
SAFE valuation caps shape future dilution more than founders think. Learn how to set the right cap, avoid compounding dilution, and model fundraising outcomes with confidence.
Customer churn explained. Definition, formula, industry benchmarks, retention strategies, and how to build a product experience that reduces churn and increases lifetime value.
Learn how startups use payback period to measure capital efficiency, balance CAC and LTV, and build predictable, investor-ready growth through sustainable customer recovery.
Learn how Net Revenue Retention reveals true startup growth efficiency, how it evolves over time, and how to model NRR to attract investors and strengthen valuation.
Learn how gross margin reveals startup scalability and efficiency. Discover how AI, fintech, and cyber companies expand margins through smarter pricing, automation, and product design.
Startup runway isn’t just time before cash runs out. Learn how to manage runway strategically, link it to milestones, and strengthen investor confidence through smarter financial modeling.
Learn how burn rate impacts runway, growth, investor confidence, and valuation—and how strategic burn helps startups scale efficiently and extend survival with control.
Learn how LTV drives retention, pricing power, profitability, and valuation, and why scalable startups design LTV to outgrow CAC for efficient, investor-ready growth.
Learn why CAC drives startup growth, profitability, runway, and investor trust, and how tracking and improving CAC helps build scalable, capital-efficient, high-value companies.
Explore key strategies for turning early-stage tech concepts into thriving ventures. Discover best practices in pitching, valuation, and compliance to fuel your pre-seed journey quickly with confidence.
Ensure your startup’s valuation meets investor standards with data-driven models, risk assessment, and market comparables. Avoid DIY mistakes by seeking professional help for fundraising or M&A.
