Customer Lifetime Value (LTV) is the single most important number in SaaS unit economics. It tells you exactly how much gross profit you can expect from a customer over the entire duration of their relationship with your product — and from that, it derives the maximum you can profitably spend to acquire them.
Without knowing your LTV, you’re setting your CAC ceiling blindly. Too low and you under-invest in growth. Too high and you burn cash faster than you’re creating value.
This free SaaS LTV calculator gives you simple LTV, gross margin-adjusted LTV, discounted LTV, and the ideal maximum CAC derived from the 3:1 LTV:CAC benchmark — the four numbers every SaaS founder, CFO, and investor needs to know.
Use the Calculator
What Is a SaaS LTV Calculator (Free) – Calculate Customer Lifetime Value?
LTV (Lifetime Value), also written as CLV (Customer Lifetime Value), is the total gross profit a SaaS business expects to earn from a single customer over the entire time they remain a subscriber.
LTV is calculated from three inputs:
- ARPU — Average Revenue Per User per month
- Gross Margin — the percentage of ARPU that becomes gross profit after direct costs
- Monthly Churn Rate — the percentage of customers who cancel each month
The relationship between these three inputs is powerful: reducing churn has a squared effect on LTV. Halving churn from 4% to 2% doubles average customer lifetime from 25 months to 50 months — and doubles LTV. This is why reducing churn is almost always a higher-leverage action than increasing ARPU.
Formula
Three versions of LTV, each progressively more accurate:
Average Customer Lifetime = 1 ÷ Monthly Churn Rate Simple LTV = ARPU × Average Customer Lifetime Gross Margin LTV = Simple LTV × Gross Margin % Discounted LTV = (ARPU × Gross Margin %) ÷ (Monthly Churn Rate + Monthly Discount Rate) Ideal Max CAC = Gross Margin LTV ÷ 3
Example Calculation
A B2B SaaS product with $99/month ARPU, 75% gross margin, and 2% monthly churn:
| ARPU (monthly) | $99 |
| Monthly churn rate | 2.0% |
| Average customer lifetime | 50 months |
| Simple LTV (revenue) | $4,950 |
| Gross margin adjustment (75%) | ×0.75 |
| Gross Margin LTV | $3,712 |
| Ideal max CAC (LTV ÷ 3) | $1,237 |
What Is a Good Result?
LTV:CAC benchmarks that define SaaS unit economics health:
| Ratio | Assessment | Meaning |
|---|---|---|
| Below 1:1 | 🚨 Destroying value | Each customer costs more to acquire than they return |
| 1:1 – 2:1 | ⚠️ Unsustainable | Barely recovering acquisition cost — requires restructuring |
| 2:1 – 3:1 | 🟡 Developing | Improving — tighten retention and pricing before scaling |
| 3:1 – 5:1 | ✅ Healthy | The SaaS standard — efficient growth engine |
| 5:1+ | 💪 Exceptional | May be under-investing — consider accelerating growth spend |
How to Improve Your Results
Reduce Churn — the Highest-Leverage LTV Action
Reducing monthly churn from 4% to 2% **doubles average customer lifetime and nearly doubles LTV**. No other single action has as direct and immediate an impact on LTV. Invest in onboarding, customer success, and product stickiness before anything else.
Grow ARPU Through Expansion Revenue
Every dollar of expansion MRR from upsells and add-ons increases ARPU and LTV with **zero additional CAC**. Systematic upsell motions triggered by usage signals are the most capital-efficient way to grow LTV at scale.
Improve Gross Margin Through Operational Efficiency
Improving gross margin from 70% to 80% increases LTV by 14% immediately. Target **infrastructure efficiency, support automation, and self-serve onboarding** — the three largest contributors to SaaS cost of revenue.
Segment LTV by Customer Type and ICP
Enterprise customers typically have **3–5× the LTV** of SMB customers due to lower churn, higher ARPU, and expansion potential. Calculating LTV by customer segment reveals which ICPs to prioritise in your GTM and where your expansion potential is highest.
Use Discounted LTV for Investor Conversations
Investors prefer **discounted LTV** (factoring in your cost of capital) because it accounts for the time value of money. Use a 10–15% annual discount rate as a starting point. Discounted LTV is always lower than simple LTV — and is considered more rigorous in due diligence.
Frequently Asked Questions
1What is a good LTV for a SaaS business?
LTV in isolation is less meaningful than the **LTV:CAC ratio**. The industry benchmark is 3:1 or higher — each customer should generate at least 3× the cost of acquiring them. In absolute terms, SaaS businesses targeting SMB typically achieve LTVs of $500–$3,000; mid-market $5,000–$30,000; enterprise $50,000+.
2How does churn rate affect LTV?
Churn has an **inverse and exponential** relationship with LTV. At 1% monthly churn, average lifetime = 100 months. At 3%, lifetime = 33 months. At 5%, only 20 months. Halving churn nearly doubles LTV. This is why reducing churn is consistently the highest-ROI retention investment available to a SaaS business.
3Should LTV include or exclude expansion revenue?
It depends on your purpose. **Simple LTV** based on initial ARPU is more conservative and easier to calculate. **Expansion-adjusted LTV** accounts for the fact that customers grow in value over time — making it more accurate for mature businesses with strong upsell motions. Both are useful; just be consistent and clearly label which you’re using.
4How do I use LTV to set my marketing budget?
The standard approach: **Max CAC = LTV ÷ 3**. If your gross margin LTV is $3,000, your maximum sustainable CAC is $1,000. Set your total sales and marketing budget by multiplying your target new customer volume by your max CAC. This ensures every growth dollar is backed by the unit economics to justify it.
Conclusion
LTV is the foundation of every rational SaaS growth decision. Use the free SaaS LTV calculator above to know your number — then use it to set your CAC ceiling, allocate your growth budget, and build a customer acquisition engine that pays for itself.