About Customer Lifetime Value Calculator
Customer Lifetime Value, or LTV, is the total profit a business can reasonably expect to earn from a single customer over the entire duration of their relationship. It is the north-star metric for subscription businesses, SaaS companies, agencies, and any model where retention matters as much as acquisition. If you know your LTV, you can answer critical questions: How much can we afford to spend to acquire a customer? Which customer segments deserve more investment? Are our retention efforts paying off? For example, if a customer pays $50 per month, your gross margin is 70%, and your monthly churn rate is 5%, the LTV formula gives you $700. That means each customer is worth roughly $700 in gross profit over their lifetime. If your customer acquisition cost is $200, your LTV:CAC ratio is 3.5:1, which is generally considered healthy for SaaS. But if your churn drops to 3%, LTV rises to about $1,167, and the same $200 acquisition cost now looks like a bargain. Small improvements in retention or margin create outsized gains in LTV, which is why the best growth teams focus as much on keeping customers as on winning them. This calculator helps you quantify those dynamics and make smarter budgeting, pricing, and retention decisions.
How It Works
You enter four inputs: average revenue per customer per month, gross margin percentage, monthly churn rate, and customer lifespan in months. The calculator computes LTV by multiplying monthly revenue by gross margin and dividing by the monthly churn rate. It also estimates an LTV:CAC ratio using a default customer acquisition cost of $100, giving you a quick benchmark for marketing efficiency. A higher LTV means each customer contributes more profit over time. A lower churn rate increases LTV by extending the expected customer lifespan. The tool is designed for subscription and recurring-revenue businesses, but it can be adapted for any model with predictable repeat purchase behavior.
Formula & Calculation Logic
LTV = (Average Revenue per Customer per Month × Gross Margin) / Monthly Churn Rate. Gross margin is entered as a percentage and converted to a decimal. Churn rate is also entered as a percentage and converted to a decimal. For example, with $50 in monthly revenue, a 70% gross margin, and 5% monthly churn, LTV = ($50 × 0.70) / 0.05 = $700. The formula assumes constant revenue, margin, and churn over time. LTV:CAC Ratio = LTV / Customer Acquisition Cost. Most SaaS investors look for a ratio of 3:1 or higher. The calculator uses a default CAC of $100 for the ratio display, so replace it with your actual CAC for accurate analysis.
Step-by-Step Guide
- Step 1: Enter the average monthly revenue generated per customer.
- Step 2: Enter your gross margin percentage after direct costs of delivery.
- Step 3: Enter your monthly churn rate, which is the percentage of customers lost each month.
- Step 4: Enter the average customer lifespan in months, which should align with your churn rate.
- Step 5: Review your LTV and LTV:CAC ratio, then test how lowering churn or raising prices affects the result.
Example Calculations
- Scenario 1: A SaaS customer paying $50/month with a 70% gross margin and 5% monthly churn has an LTV of $700.
- Scenario 2: Reducing churn from 5% to 3% while keeping revenue and margin constant raises LTV from $700 to approximately $1,167.
- Scenario 3: A subscription box with $30 monthly revenue, 50% margin, and 10% monthly churn has an LTV of $150.
Common Use Cases
- Setting a maximum allowable customer acquisition cost for paid advertising campaigns.
- Comparing LTV across customer segments, channels, or pricing tiers.
- Justifying investment in customer success and retention programs.
- Evaluating whether a freemium or low-price tier is economically viable.
- Reporting to investors using a standard SaaS health metric.
Pro Tips
- Segment LTV by acquisition channel; not all customers are equally profitable.
- Use cohort-based churn for accuracy instead of a single blended churn rate.
- Factor in expansion revenue from upsells and cross-sells to increase LTV.
- Recalculate LTV quarterly because churn and margin change over time.
- Aim for an LTV:CAC ratio of at least 3:1, but context matters by industry and growth stage.
Common Mistakes to Avoid
- Using revenue instead of gross margin, which overstates true customer value.
- Ignoring revenue expansion from upgrades, add-ons, or usage growth.
- Using a churn rate that does not match the same time period as revenue.
- Comparing LTV across businesses with very different cost structures.
- Treating LTV as a fixed number rather than a moving target that requires regular updates.
Why Use This Tool?
- Quantifies the long-term value of customer relationships in concrete dollars.
- Aligns marketing spend with actual customer profitability.
- Highlights the financial impact of retention and churn improvements.
- Provides a common language for executives, marketers, and investors.