Business

SaaS LTV Calculator

Calculate customer lifetime value from ARPU, churn rate, and gross margin. Understand how much each customer is worth to your SaaS business.

Quick Answer

LTV = (ARPU x Gross Margin) / Monthly Churn Rate. A customer paying $100/mo with 80% margin and 5% churn has an LTV of $1,600. Aim for LTV:CAC ratio of 3:1 or better.

Calculate LTV

Enter your average revenue per user, monthly churn rate, and gross margin.

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Disclaimer: This calculator provides simplified LTV estimates based on the standard SaaS LTV formula. Actual lifetime value depends on expansion revenue, contraction, cohort behavior, and other factors. This tool is for educational purposes only and should not be considered financial advice.

About This Tool

The SaaS LTV Calculator helps founders, operators, and investors quickly determine the lifetime value of a SaaS customer. LTV is one of the most fundamental SaaS metrics because it establishes the ceiling for customer acquisition spending and drives nearly every growth decision a SaaS business makes.

Understanding the LTV Formula

The core LTV formula for SaaS is: LTV = (ARPU x Gross Margin) / Monthly Churn Rate. ARPU (Average Revenue Per User) is the average monthly revenue generated per customer. Gross Margin is the percentage of revenue remaining after direct costs of service delivery (hosting, support, onboarding). Churn Rate is the percentage of customers who cancel their subscription each month. By including gross margin, the formula gives you the profit-adjusted lifetime value rather than just total revenue, which is more useful for understanding true unit economics.

Why LTV Matters for SaaS Businesses

LTV is the foundation of SaaS unit economics. Without knowing your LTV, you cannot determine how much to spend on acquiring customers (CAC), whether your business model is sustainable, or how to allocate resources between acquisition and retention. The most commonly cited benchmark is the LTV:CAC ratio, where a ratio of 3:1 or higher indicates a healthy business. A ratio below 1:1 means you are spending more to acquire customers than they will ever generate in profit, which is unsustainable regardless of growth rate. LTV also helps you compare customer segments, pricing tiers, and acquisition channels to focus on the most valuable opportunities.

The Outsized Impact of Churn on LTV

Because churn rate sits in the denominator of the LTV formula, small changes in churn have dramatic effects on lifetime value. Consider a SaaS business with $100 ARPU and 80% gross margin. At 10% monthly churn, LTV is $800. At 5% monthly churn, LTV doubles to $1,600. At 2% monthly churn, LTV jumps to $4,000. This five-fold improvement from reducing churn by 8 percentage points illustrates why retention is often the highest-leverage activity for SaaS businesses. Investing in customer success, onboarding, and product quality can yield far greater returns than pouring more money into acquisition.

Limitations of the Basic LTV Formula

The simple LTV formula assumes constant ARPU, constant churn, and no expansion revenue. In practice, many SaaS businesses see ARPU increase over time through upsells and cross-sells (net revenue retention above 100%), while churn rates often vary by cohort and tenure. More sophisticated models use cohort-based analysis or discounted cash flow approaches to account for these dynamics. However, the simple formula remains valuable as a quick benchmark and directional indicator, especially for early-stage companies that do not yet have enough data for complex modeling.

Frequently Asked Questions

What is SaaS Customer Lifetime Value (LTV)?
SaaS LTV is the total revenue you can expect from a single customer over the entire duration of their subscription. It accounts for how long customers typically stay (inverse of churn rate) and the recurring revenue they generate each month. LTV is one of the most important SaaS metrics because it tells you the upper bound of what you can spend to acquire a customer while remaining profitable.
How is LTV calculated for SaaS businesses?
The standard SaaS LTV formula is: LTV = (ARPU x Gross Margin %) / Monthly Churn Rate. ARPU is Average Revenue Per User per month. Gross Margin accounts for the direct costs of serving that customer. Churn Rate is the percentage of customers who cancel each month. For example, with $100 ARPU, 80% gross margin, and 5% monthly churn: LTV = ($100 x 0.80) / 0.05 = $1,600.
What is a good LTV to CAC ratio?
A healthy LTV:CAC ratio is generally 3:1 or higher. This means the lifetime value of a customer should be at least three times what it costs to acquire them. A ratio below 1:1 means you are losing money on every customer. Ratios above 5:1 may indicate you are under-investing in growth and could afford to spend more on acquisition to grow faster.
How does churn rate affect LTV?
Churn rate has an outsized impact on LTV because it sits in the denominator of the formula. Cutting monthly churn from 5% to 2.5% doubles your LTV. A business with 1% monthly churn has customers lasting an average of 100 months (over 8 years), while 10% monthly churn means an average lifespan of just 10 months. Small improvements in retention yield enormous LTV gains.
Should I use monthly or annual churn for LTV?
Use monthly churn rate with monthly ARPU for consistent calculations. If you only know annual churn, convert it: Monthly Churn = 1 - (1 - Annual Churn)^(1/12). For example, 30% annual churn is roughly 2.9% monthly churn. Using annual churn directly in the formula with monthly ARPU will give incorrect results because the time periods do not match.

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