SaaS Lifetime Value (LTV) Calculator
Enter your average revenue per account, gross margin, and monthly churn rate to see the lifetime value of a typical SaaS customer. Add your customer acquisition cost for the LTV:CAC ratio and payback period. Optionally include expansion revenue for a more accurate picture when you upsell existing accounts. Results update as you type.
What is SaaS Lifetime Value (LTV)?
Customer Lifetime Value, often called LTV or CLV, is the total gross profit a SaaS business expects to earn from a single customer account over the entire period they remain a subscriber. It combines three factors: how much a customer pays on average each month (ARPA), how much of that revenue the business retains after delivery costs (gross margin), and how long the average customer stays before cancelling (driven by churn). A simple way to picture it is: if 100 customers sign up today and 2 % of them cancel every month, you can expect the average customer to stay about 50 months and generate 50 months of gross profit before leaving. LTV answers the question "how much is a new customer actually worth?" and sets the ceiling on what you can afford to spend acquiring one.
The LTV formula explained
The standard margin-adjusted formula is LTV = (ARPA x Gross Margin %) / Monthly Churn Rate. Breaking it down: ARPA multiplied by gross margin gives the monthly gross profit per customer. Dividing that by the monthly churn rate gives the present value of all future months, because 1 / churn equals the average number of months before a customer cancels. For example, $150 ARPA with 75 % gross margin yields $112.50 per month in gross profit. At 2 % monthly churn (average lifetime of 50 months), LTV = $112.50 / 0.02 = $5,625. When you have positive expansion revenue (upsells, seat additions), the formula adjusts to use net churn instead of gross churn: net churn = gross churn minus expansion rate. This rewards businesses that grow revenue from existing accounts, which is the most capital-efficient way to compound SaaS growth.
LTV:CAC ratio and the 3x benchmark
LTV alone is not enough: what matters is the ratio of lifetime value to the cost of acquiring each customer (CAC). The widely cited rule of thumb is that a healthy SaaS business targets an LTV:CAC ratio of at least 3x, meaning each customer generates three times the gross profit compared to what it cost to win them. A ratio below 1x means you lose money on every sale. Between 1x and 3x, the business is marginally profitable at the unit level but fragile. Above 5x can sometimes indicate under-investment in growth. The companion metric is the CAC payback period: how many months of gross profit it takes to recover the acquisition cost. World-class SaaS companies aim for under 12 months; 18-24 months is acceptable for enterprise deals with long contract lengths.
How to improve SaaS LTV in practice
LTV can be raised by increasing ARPA (pricing, upsells, cross-sells), improving gross margin (infrastructure efficiency, tiered support), reducing churn (better onboarding, customer success, product stickiness), or generating expansion revenue that offsets churn. Of these, churn reduction has the largest leverage: moving from 3 % to 2 % monthly churn roughly doubles LTV, because the denominator in the formula drops by a third while the customer lifetime rises from 33 to 50 months. Expansion revenue above the churn rate creates negative net churn, which means your existing revenue base grows even without new customers. Net revenue retention above 100 % is the hallmark of the best-performing enterprise SaaS companies and the single biggest driver of valuation multiples.
LTV:CAC benchmarks by growth stage
| LTV:CAC ratio | Assessment | Typical context |
|---|---|---|
| Below 1x | Unprofitable | Unit economics are inverted - each acquisition destroys value |
| 1x to 2x | Weak | Acquisition is marginally profitable but leaves little room for overhead |
| 3x | Healthy (benchmark) | The widely cited minimum target for sustainable growth |
| 4x to 5x | Excellent | Strong retention or low CAC, common in PLG or product-led companies |
| Above 5x | Review spending | May signal under-investment in growth - consider raising acquisition spend |
Industry consensus on LTV:CAC ratio targets across SaaS company stages. A ratio below 1x means you lose money on every customer acquired.
Frequently asked questions
What is a good LTV for a SaaS business?
There is no universal "good" LTV number in isolation because it depends entirely on your acquisition cost and market. What matters is the LTV:CAC ratio. A 3x ratio is the standard minimum benchmark for capital-efficient growth. For SMB SaaS with typical monthly churn of 2-5 % and ARPA of $50-$200, LTV often falls between $1,000 and $10,000. Enterprise SaaS with lower churn and higher ARPA can see LTV in the hundreds of thousands of dollars per account.
What is the difference between LTV and CLV?
They are the same metric. Customer Lifetime Value (CLV) and Lifetime Value (LTV) are both used interchangeably in SaaS to describe the total gross profit expected from a single customer. Some practitioners also use CLTV (Customer Lifetime Value) or LCV. The underlying formula is the same regardless of the acronym used.
How does churn affect LTV?
Churn has a non-linear effect on LTV because it controls the denominator in the formula. Halving your monthly churn rate doubles your LTV. For example, going from 4 % to 2 % monthly churn does not just add a few months of revenue - it doubles the entire customer lifetime from 25 months to 50 months. This is why churn reduction is consistently ranked as the highest-leverage activity for improving SaaS unit economics.
Should I use monthly or annual churn in the LTV formula?
Always use the same time unit as your ARPA. If ARPA is monthly recurring revenue, use monthly churn. If ARPA is annual recurring revenue, use annual churn. Mixing units will overstate or understate LTV by up to 12x. Monthly churn is more granular and common for SMB SaaS with short contracts; annual churn is used for enterprise deals with yearly subscriptions.
What is expansion revenue and why does it matter for LTV?
Expansion revenue is additional monthly recurring revenue generated from existing customers through upsells, seat upgrades, add-on purchases, or usage growth. It reduces your effective (net) churn rate. If gross churn is 3 % per month but existing customers expand their spend by 1 % per month on average, the net churn is only 2 %. This directly raises LTV. When expansion exceeds gross churn, you have negative net churn, meaning your existing revenue base grows every month without any new customer acquisitions.
What is CAC payback period and how is it calculated?
CAC payback period is the number of months needed to recover the cost of acquiring a customer from the gross profit that customer generates. The formula is CAC / (ARPA x Gross Margin). For example, a $900 CAC and $112.50 monthly gross profit yields a payback of 8 months. A shorter payback means the business can reinvest recovered capital faster. Most investors target under 18 months for growth-stage SaaS; under 12 months is considered excellent. Long paybacks require more working capital and increase sensitivity to churn before breakeven.
Why does LTV use gross margin rather than revenue?
Using raw revenue instead of gross profit overstates the true economic value of a customer because it ignores the cost of delivering your product. Gross margin deducts hosting, infrastructure, payment processing fees, and front-line support costs. Including them gives you the actual cash that flows toward covering sales, marketing, R&D, and eventually profit. Most SaaS companies run gross margins of 60-85 %. Using revenue in place of gross margin can inflate LTV by 15-67 % and lead to overspending on customer acquisition.