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SaaS Customer Lifetime Value (LTV) Calculator

Calculate the projected gross profit a single customer generates for your SaaS business over their entire lifespan.

The percentage of revenue retained after serving the customer (excluding sales/marketing).

The percentage of customers who cancel subscriptions each month.

function calculateSaaSLTV() { var arpuInput = document.getElementById('saas-arpu'); var marginInput = document.getElementById('saas-margin'); var churnInput = document.getElementById('saas-churn'); var resultDiv = document.getElementById('ltv-result'); var arpu = parseFloat(arpuInput.value); var marginPct = parseFloat(marginInput.value); var churnPct = parseFloat(churnInput.value); if (isNaN(arpu) || isNaN(marginPct) || isNaN(churnPct) || arpu < 0 || marginPct 100 || churnPct 100) { resultDiv.innerHTML = 'Please enter valid positive numbers. Gross Margin must be between 0-100. Churn Rate must be greater than 0 and less than or equal to 100.'; return; } // Convert percentages to decimals for calculation var grossMarginDecimal = marginPct / 100; var churnRateDecimal = churnPct / 100; // Standard SaaS LTV Formula: (ARPU * Gross Margin %) / Churn Rate % // This formula assumes churn happens linearly over time. var ltv = (arpu * grossMarginDecimal) / churnRateDecimal; var formattedLTV = ltv.toLocaleString('en-US', { style: 'currency', currency: 'USD' }); resultDiv.innerHTML = '

Estimated Customer Lifetime Value (LTV)

' + formattedLTV + 'Based on these inputs, the average customer lifespan is approximately ' + (1 / churnRateDecimal).toFixed(1) + ' months.'; }

Understanding SaaS Customer Lifetime Value (LTV)

For Software-as-a-Service (SaaS) businesses, Customer Lifetime Value (LTV) is perhaps the most critical metric for determining long-term viability. It represents the total amount of gross profit a single customer is expected to generate for your company over the entire duration of their subscription relationship.

Unlike e-commerce, where a transaction is often one-off, SaaS relies on recurring revenue. LTV tells you exactly how much a new customer is worth in the long run. This metric is essential because it dictates your allowable Customer Acquisition Cost (CAC). A common rule of thumb in healthy SaaS companies is that your LTV should be at least three times higher than your CAC (LTV:CAC ratio of > 3:1).

The Components of the LTV Formula

This calculator uses the standard "simple" LTV formula, which is highly effective for established SaaS businesses with predictable churn metrics:

LTV = (ARPU × Gross Margin %) / Churn Rate %

  • Average Revenue Per User (ARPU): The average monthly recurring revenue you receive per active account. If you have tiered pricing, this is the weighted average across all tiers.
  • Gross Margin (%): This is the percentage of revenue left over after accounting for the direct costs of servicing the customer (COGS). In SaaS, this typically includes hosting costs, third-party license fees required for the service, and customer support infrastructure. High-performing SaaS companies often aim for gross margins above 80%.
  • Monthly Churn Rate (%): The percentage of your customer base that cancels their subscription in a given month. This is the denominator in the formula because it dictates customer lifespan. A lower churn rate dramatically increases LTV.

Example Calculation

Let's imagine a B2B SaaS company with the following metrics:

  • Their average customer pays $150 per month (ARPU).
  • It costs them relatively little to host the service, leading to a high Gross Margin of 85%.
  • They experience a monthly customer Churn Rate of 4%.

Using the calculator above, the math works out as follows:

($150 × 0.85) / 0.04 = $127.50 / 0.04 = $3,187.50

In this scenario, every new customer signed is worth an estimated $3,187.50 in gross profit over their lifetime. Knowing this, the company knows they can afford to spend significantly to acquire that customer while remaining profitable.

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