Free SaaS LTV Calculator
Enter your account economics to get LTV, customer lifespan, and LTV:CAC ratio.
* LTV assumes stable churn and ARPA over the customer lifetime. For companies with strong expansion revenue (upsells), actual LTV often runs higher than this baseline formula.
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What Is Customer Lifetime Value (LTV)?
Customer Lifetime Value (LTV), sometimes written CLV, is the total gross-margin-adjusted revenue a business expects to earn from a customer over the full length of their relationship. In SaaS, LTV is one of the two numbers (alongside CAC) that determine whether the growth engine is actually profitable. A company can grow revenue quickly and still be losing money on every customer if LTV doesn't sufficiently exceed acquisition cost.
SaaS LTV Formula
This formula works because 1 ÷ Churn Rate gives the average customer lifespan in months. Multiplying that lifespan by the gross-margin-adjusted monthly revenue per account gives the total profit a typical customer generates over their full lifetime.
| Monthly Churn | Avg. Customer Lifespan |
|---|---|
| 1% | 100 months (~8.3 years) |
| 2% | 50 months (~4.2 years) |
| 3% | 33 months (~2.8 years) |
| 5% | 20 months (~1.7 years) |
| 10% | 10 months |
LTV:CAC Ratio Explained
LTV on its own only tells half the story. It needs to be compared against Customer Acquisition Cost (CAC), the fully-loaded cost of sales and marketing spend to win one new customer.
| LTV:CAC Ratio | Interpretation |
|---|---|
| Below 1:1 | Losing money on every customer acquired |
| 1:1 – 3:1 | Marginal, unit economics are thin |
| 3:1 – 5:1 | Healthy, commonly cited as the target zone |
| Above 5:1 | Very strong, but may signal under-investment in growth |
The widely cited "3:1 rule" comes from early SaaS benchmarking work (notably by investor David Skok) and remains the most commonly used rule of thumb, though it's a floor, not a target, most efficient, high-growth SaaS companies operate closer to 4:1 or 5:1.
LTV & LTV:CAC Benchmarks by Stage
| Stage | Typical Monthly Churn | Target LTV:CAC | CAC Payback |
|---|---|---|---|
| Early-stage SaaS (SMB) | 3–5% | 2:1 – 3:1 | 12–18 months |
| Growth-stage SaaS (SMB) | 1.5–3% | 3:1 – 4:1 | 9–15 months |
| Mid-market SaaS | 1–2% | 4:1 – 5:1 | 6–12 months |
| Enterprise SaaS | 0.5–1% | 5:1+ | <12 months |
Benchmarks vary by pricing model, sales motion (self-serve vs sales-led), and market. Use these as directional targets, not hard rules.
How to Improve LTV
- Reduce churn first: because lifespan is 1 ÷ churn, even small churn reductions compound into large LTV gains.
- Grow ARPA through expansion revenue: upsells, cross-sells, and usage-based pricing tiers increase average revenue per account without adding new customers.
- Improve gross margin: optimizing infrastructure costs, support automation, and onboarding efficiency directly increases the margin-adjusted portion of LTV.
- Segment churn by cohort: aggregate churn numbers can hide a high-churn segment dragging down blended LTV; fixing onboarding for the worst-performing segment often has outsized impact.
- Invest in customer success proactively: companies with dedicated CS motions for at-risk accounts typically see meaningfully lower churn than reactive-support-only models.
Frequently Asked Questions
What is customer lifetime value?
Customer lifetime value (LTV or CLV) is the total gross-margin-adjusted revenue a business expects to earn from a customer over the full length of their relationship. It's one of the core metrics used to judge whether a SaaS company's growth is actually profitable.
How do you calculate customer lifetime value?
First calculate average customer lifespan as 1 divided by monthly churn rate. Then multiply that lifespan by monthly revenue per account adjusted for gross margin. For example, at $250 ARPA, 80% gross margin, and 2.5% monthly churn: lifespan is 40 months, and LTV is $250 × 0.80 × 40 = $8,000.
How can you increase customer lifetime value?
The two highest-leverage levers are reducing churn and growing average revenue per account. Because lifespan is the inverse of churn, even small churn reductions compound into large LTV gains. Upsells, cross-sells, and usage-based pricing tiers grow ARPA without adding new customers.
What is a good LTV to CAC ratio?
A ratio of at least 3:1 is the commonly cited minimum for healthy SaaS unit economics, meaning a customer generates at least three times what it cost to acquire them. Ratios of 4:1 to 5:1 are considered strong.
What's the difference between CAC and LTV?
LTV is the total gross-margin-adjusted revenue a customer generates over their relationship with the company. CAC is the fully-loaded sales and marketing cost to acquire one new customer. Comparing the two as a ratio shows whether the growth engine is actually profitable.
Can you give an example of a customer lifetime value calculation?
At $250 monthly ARPA, 80% gross margin, and 2.5% monthly churn, average customer lifespan is 1 ÷ 0.025 = 40 months. LTV is then $250 × 0.80 × 40 = $8,000. If CAC is $1,500, the LTV:CAC ratio is roughly 5.3:1, a strong result.
