Estimate long-term customer profit and compare with CAC health rule.
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The Customer Lifetime Value Calculator estimates the total profit a single customer generates over their entire relationship with your business. By factoring in revenue, margins, and retention, you can make smarter decisions about how much to invest in acquisition and which customer segments deserve the most attention.
Customer lifetime value, or LTV, projects the total gross profit a business can expect from one customer account throughout the relationship. It multiplies the average revenue per period by the gross margin percentage and the average number of periods a customer stays active. When compared against your customer acquisition cost, LTV reveals whether your growth model is sustainable. A healthy LTV-to-CAC ratio of 3:1 or higher is the widely accepted benchmark. This free, browser-based calculator delivers these insights instantly.
Enter the average revenue each customer generates per period, your gross margin percentage, and the average customer lifespan in matching period units. Optionally add your CAC to see the LTV-to-CAC ratio. Click Calculate and the tool displays your estimated lifetime value along with ratio analysis if CAC is provided. Everything runs in your browser with no data uploaded and no account needed. Experiment with different retention or margin scenarios to see how small improvements compound over time.
The widely cited benchmark for a healthy business is an LTV-to-CAC ratio of at least 3:1, meaning each customer generates at least three times the profit required to acquire them. A ratio below 2:1 typically indicates unsustainable unit economics — the business is spending too much to win customers relative to the revenue those customers generate. Ratios above 5:1 can indicate the opposite problem: the business is under-investing in acquisition and may be leaving growth on the table by being overly conservative with its sales and marketing budget. For SaaS and subscription businesses, many investors look for 5:1 or higher at scale because the recurring nature of revenue makes each retained customer exceptionally valuable. Early-stage businesses often operate below 3:1 while building out their retention and monetization capabilities, but demonstrating a clear path to 3:1 is typically required before institutional investors will commit capital to growth.
If you track monthly customer churn, the simplest estimate for average customer lifespan is to divide 1 by your monthly churn rate. If 5% of your customers cancel or stop purchasing each month (a monthly churn rate of 0.05), your average customer lifespan is 1 ÷ 0.05 = 20 months. If your churn data is annual, divide 1 by the annual churn rate to get lifespan in years. For example, a 25% annual churn rate implies an average customer lifespan of 4 years. This formula assumes a constant churn rate across the customer base, which is a simplification — in practice, churn is often higher in the first few months and lower for long-tenured customers. If you have detailed cohort data, calculating the actual average tenure from your historical customer cohorts produces a more accurate lifespan estimate than the inverse churn method.
Yes. All values entered into the Customer Lifetime Value Calculator — including revenue, margin, customer lifespan, and CAC figures — are processed entirely within your browser and are never transmitted to or stored by Popupnote.com's servers. The tool operates fully client-side using JavaScript. No business or financial data is logged or shared. Closing or refreshing the page clears all entered values.