Most SaaS founders can tell you their MRR. Far fewer can tell you their LTV - and that gap is expensive. Without knowing how much a customer is worth over their lifetime, you cannot make informed decisions about how much to spend acquiring one.
Customer Lifetime Value (LTV, also written CLV) is the single most important number for a subscription business. It tells you how much revenue, on average, you can expect from a customer before they churn. Get this number right and every other growth decision gets sharper.
What Is Customer Lifetime Value?
LTV is the total revenue you expect to earn from a customer over the entire duration of their relationship with your business. It is not the total contract value of a single deal. It accounts for how long customers typically stay, how much they pay, and how much of that revenue you actually keep after costs.
A customer paying $100 per month who stays for two years is worth $2,400 in revenue. But if your cost of goods sold eats 30% of that, their LTV is closer to $1,680. That distinction matters enormously when you are evaluating whether a $500 acquisition cost is sustainable.
The LTV Formula
The most practical LTV formula for subscription businesses is:
LTV = ARPU x Gross Margin % x (1 / Churn Rate)
Breaking that down:
- ARPU (Average Revenue Per User): Your MRR divided by your number of paying customers
- Gross Margin %: Revenue minus cost of goods sold, expressed as a percentage
- 1 / Churn Rate: This gives you average customer lifespan in months. At 5% monthly churn, customers stay an average of 20 months.
Example: ARPU of $80, gross margin of 75%, monthly churn of 4%
LTV = $80 x 0.75 x (1 / 0.04) = $80 x 0.75 x 25 = $1,500
Some tools let you input customer lifespan directly if you know it from historical data. If your average customer stays 30 months, use that instead of deriving it from churn rate. Historical data is more accurate when you have it.
Why Gross Margin Changes Everything
A common mistake is calculating LTV on revenue alone. Two companies can have identical ARPU and churn, but very different LTVs depending on how much it costs to deliver the product.
A pure software product with 80% gross margins and $100 ARPU has an LTV of $2,000 at 4% churn. A service-heavy business with 40% margins and the same ARPU has an LTV of only $1,000. The gross margin adjustment is not optional - it is what separates revenue from value.
For most B2B SaaS, gross margins run between 65% and 85%. Consumer SaaS tends to be slightly lower. Anything involving significant human services or fulfillment costs will be lower still.
Try the LTV Calculator - free, instant results.
Open toolThe LTV:CAC Ratio Explained
LTV in isolation is not very useful. Its power comes from comparing it to Customer Acquisition Cost (CAC). The LTV:CAC ratio tells you how efficiently you are converting acquisition spend into long-term value.
LTV:CAC = LTV / CAC
If your LTV is $1,500 and it costs $500 to acquire a customer, your LTV:CAC ratio is 3:1.
Industry Benchmarks
| LTV:CAC | What It Signals |
|---|---|
| Below 1:1 | You are losing money on every customer |
| 1:1 to 2:1 | Acquisition costs are too high relative to value |
| 3:1 | Generally considered healthy for SaaS |
| 4:1+ | You may be under-investing in growth |
| 5:1+ | Potential to accelerate acquisition spend |
A 3:1 ratio is the most commonly cited benchmark, but context matters. Early-stage companies often operate below this while finding product-market fit. Companies with long sales cycles or high implementation costs may need higher ratios to account for payback period.
Payback period - the time it takes to recoup CAC - is a related metric worth tracking. If it takes 18 months to recover acquisition costs, you need the cash to sustain that gap.
Churn Rate vs Lifespan: Two Ways to Input the Same Data
Most LTV calculators accept either churn rate or average customer lifespan. They are two sides of the same number.
Churn rate method: If you know your monthly churn percentage, the calculator derives lifespan for you. Monthly churn of 2% implies an average lifespan of 50 months. Monthly churn of 10% implies 10 months.
Lifespan method: If you have cohort data showing average customer tenure, use that directly. Cohort-based lifespan data is typically more accurate than the mathematical approximation from churn rate, because real churn is not linear - many customers churn early, and those who stay tend to stay longer.
If your churn rate varies significantly by plan, segment, or acquisition channel, calculate LTV separately for each. A blended LTV hides the fact that enterprise customers on annual contracts may be worth five times more than self-serve monthly subscribers.
How to Increase LTV
Improving LTV comes down to three levers: keeping customers longer, getting more revenue from them, or reducing the cost to serve them.
Reduce Churn
Churn has a compounding effect on LTV. Reducing monthly churn from 5% to 3% extends average lifespan from 20 to 33 months - a 65% increase in LTV before touching any other variable.
Focus first on identifying why customers churn. Exit surveys, cancellation flows with required reason codes, and regular check-ins with at-risk accounts all surface patterns. Common culprits: customers not reaching the activation moment, poor onboarding, or a specific feature gap that competitors solve.
Increase ARPU Through Upsells and Expansions
Expansion revenue from existing customers is the most efficient revenue in SaaS. It costs far less than new customer acquisition and comes with existing trust.
Structured upgrade paths, usage-based components that grow with customer scale, and proactive account management for high-potential accounts all drive ARPU higher over time. A Net Revenue Retention above 100% means your existing customer base grows even with some churn - a very strong position.
Improve Gross Margin
As your product matures and you move customers to self-serve channels, support costs typically decrease as a percentage of revenue. Infrastructure costs per customer often decline with scale. Both improve gross margin and lift LTV without requiring any change in customer behavior.
Getting Started
Use our LTV Calculator to calculate your customer lifetime value in under a minute. Enter your ARPU, gross margin, and either your churn rate or average customer lifespan. The calculator outputs your LTV and LTV:CAC ratio alongside benchmark comparisons so you can see where you stand.
Frequently Asked Questions
What is a good LTV:CAC ratio? A 3:1 ratio is the widely accepted benchmark for SaaS and subscription businesses, for every £1 or $1 spent acquiring a customer, you should generate £3 or $3 in lifetime value. Below 1:1 means you are losing money on every customer. Above 5:1 is strong, but can also signal you are underinvesting in growth.
What is the LTV formula? The most practical formula is: LTV = ARPU × Gross Margin % × (1 ÷ Monthly Churn Rate). For example, if ARPU is $80, gross margin is 75%, and monthly churn is 4%, LTV = $80 × 0.75 × 25 = $1,500. You can also input average customer lifespan directly if you have cohort data.
What is the difference between LTV and CLV? LTV (Lifetime Value) and CLV (Customer Lifetime Value) are the same metric with different acronyms. Both measure the total revenue, adjusted for gross margin, that a business expects to earn from a customer over the full duration of their relationship. The terms are used interchangeably across SaaS, e-commerce, and subscription businesses.
How do you calculate customer lifespan from churn rate? Average customer lifespan in months = 1 ÷ monthly churn rate. At 5% monthly churn, average lifespan is 20 months. At 2% churn, it is 50 months. This formula assumes a constant churn rate, which is a simplification, real churn is often front-loaded, with more customers leaving in their first months than later.
Does LTV include gross margin or is it just revenue? Always include gross margin in your LTV calculation. LTV based on revenue alone overstates the true value of a customer. Two businesses with identical ARPU and churn can have very different LTVs if one has 80% gross margins and the other has 40%. The gross margin adjustment is what separates revenue from value.
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