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SaaS Customer Lifetime Value (LTV) Calculator

Determine the projected gross revenue a single customer will generate throughout their lifespan with your SaaS business.

Your average monthly recurring revenue (MRR) per customer.

The percentage of revenue retained after Cost of Goods Sold (COGS) (e.g., hosting, support).

The percentage of customers who cancel their subscription each month.

function calculateSaasLtv() { // 1. Retrieve inputs matching exact IDs var arpaInput = document.getElementById('saas-arpa').value; var marginInput = document.getElementById('saas-margin').value; var churnInput = document.getElementById('saas-churn').value; var resultDiv = document.getElementById('saas-ltv-result'); // 2. Parse values to floats var arpa = parseFloat(arpaInput); var marginPercent = parseFloat(marginInput); var churnPercent = parseFloat(churnInput); // 3. Validate inputs (Must be numbers, non-negative. Churn must be > 0 to avoid infinity) if (isNaN(arpa) || arpa < 0 || isNaN(marginPercent) || marginPercent 100 || isNaN(churnPercent) || churnPercent 100) { resultDiv.style.display = "block"; resultDiv.innerHTML = 'Please enter valid positive numbers. Churn rate must be greater than zero.'; return; } // 4. Topic-Specific Calculation Logic: LTV = (ARPA * (Margin/100)) / (Churn/100) // We calculate monthly gross profit first. var monthlyGrossProfit = arpa * (marginPercent / 100); // Then divide by churn rate (decimal form) to get lifetime value. var ltv = monthlyGrossProfit / (churnPercent / 100); // Calculate average customer lifespan in months for additional context (1 / churn decimal) var lifespanMonths = 1 / (churnPercent / 100); // 5. Format the output as currency USD var formatter = new Intl.NumberFormat('en-US', { style: 'currency', currency: 'USD', minimumFractionDigits: 2, maximumFractionDigits: 2, }); var formattedLtv = formatter.format(ltv); // 6. Display the result with topic-relevant metrics resultDiv.style.display = "block"; resultDiv.innerHTML = `

Estimated Customer LTV: ${formattedLtv}

Based on these metrics, the average customer will generate ${formattedLtv} in gross profit over their relationship with your company. Projected Average Customer Lifespan: ${lifespanMonths.toFixed(1)} months. `; }

Understanding SaaS Customer Lifetime Value (LTV)

For Software-as-a-Service (SaaS) businesses, Customer Lifetime Value (LTV or CLTV) is arguably the most critical "north star" metric. It represents the total amount of gross profit a customer is expected to generate for your company from the moment they sign up until the moment they churn (cancel).

Unlike traditional transactional businesses, SaaS relies on recurring revenue. Therefore, understanding the long-term value of a customer is essential for making informed decisions about how much you can afford to spend to acquire them.

The LTV Calculation Formula

This calculator uses the standard formula for subscription businesses to estimate LTV based on monthly metrics:

LTV = (Average Monthly Revenue per Account × Gross Margin %) / Monthly Churn Rate

  • ARPA (Average Revenue Per Account): Your total Monthly Recurring Revenue (MRR) divided by your total number of active customers.
  • Gross Margin %: SaaS businesses rarely keep 100% of revenue. You must deduct COGS (Cost of Goods Sold), such as server costs, third-party API fees, and customer support salaries. A typical healthy SaaS margin is 70%-85%.
  • Churn Rate: The percentage of customers who cancel their subscriptions within a given month. Because it is in the denominator, a lower churn rate significantly increases LTV.

Why LTV is Critical for Growth

Knowing your LTV allows you to evaluate the efficiency of your sales and marketing efforts by comparing it to your Customer Acquisition Cost (CAC).

The golden rule in SaaS is the 3:1 LTV to CAC ratio. This means your LTV should be at least three times higher than what it costs to acquire that customer. If your LTV is $3,000, you should ideally spend no more than $1,000 to acquire a new customer to ensure sustainable profitability.

Example Scenario

Imagine a B2B SaaS company with the following metrics:

  • They charge an average of $150 per month (ARPA).
  • Their hosting and support costs mean they have an 80% gross margin.
  • They experience a monthly churn rate of 2%.

Using the calculator above: ($150 * 0.80) / 0.02 = $6,000 LTV. This means this company can afford to spend significantly on acquisition while remaining highly profitable.

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