Calculate the estimated total revenue a single customer will generate for your SaaS business over their lifetime, adjusting for costs and churn.
The average monthly recurring revenue (MRR) generated from one active customer.
The percentage of revenue retained after direct Cost of Goods Sold (e.g., server costs, support). Typically 70-90% for SaaS.
The percentage of customers who cancel their subscription each month. Must be greater than 0.
Estimated Customer Lifetime Value
$0.00Total Value per Customer
Estimated Average Customer Lifespan: 0 months.
function calculateSaaSCLV() {
// 1. Get input values
var arpuInput = document.getElementById('saas-arpu').value;
var marginInput = document.getElementById('saas-gross-margin').value;
var churnInput = document.getElementById('saas-churn-rate').value;
var resultsDiv = document.getElementById('saas-results');
var clvOutput = document.getElementById('result-clv-value');
var lifespanOutput = document.getElementById('result-lifespan-value');
// 2. Parse values to floats
var arpu = parseFloat(arpuInput);
var marginPercent = parseFloat(marginInput);
var churnPercent = parseFloat(churnInput);
// 3. Validate inputs (NaN check, negative numbers, realistic percentage bounds)
if (isNaN(arpu) || arpu < 0) {
alert("Please enter a valid, non-negative Average Revenue Per User.");
return;
}
if (isNaN(marginPercent) || marginPercent 100) {
alert("Please enter a valid Gross Margin percentage between 0 and 100.");
return;
}
// Churn must be > 0 to avoid division by zero errors in the formula
if (isNaN(churnPercent) || churnPercent 100) {
alert("Please enter a valid Monthly Churn Rate percentage between 0.01 and 100. Churn cannot be zero for this calculation.");
return;
}
// 4. Perform Calculations
// Convert percentages to decimals for standard math
var marginDecimal = marginPercent / 100;
var churnDecimal = churnPercent / 100;
// Gross Profit per user per month
var monthlyGrossProfit = arpu * marginDecimal;
// Average Lifespan formula: 1 / Monthly Churn Rate (decimal)
var lifespanMonths = 1 / churnDecimal;
// Simple SaaS LTV Formula: (ARPU * Gross Margin %) / Monthly Churn Rate %
// Which equals: Monthly Gross Profit * Lifespan
var clvTotal = monthlyGrossProfit * lifespanMonths;
// 5. Update the UI with formatted results
clvOutput.innerHTML = "$" + clvTotal.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
lifespanOutput.innerHTML = lifespanMonths.toLocaleString(undefined, {minimumFractionDigits: 1, maximumFractionDigits: 1});
// 6. Show results container
resultsDiv.style.display = "block";
}
Why SaaS CLV Matters
Customer Lifetime Value (CLV or LTV) is perhaps the most critical metric for any subscription-based business. It represents the total net profit your company makes from any given customer.
Knowing your CLV allows you to determine how much you can afford to spend to acquire a new customer (Customer Acquisition Cost, or CAC). A healthy SaaS business typically aims for an LTV:CAC ratio of 3:1 or higher, meaning the customer generates three times more value than it cost to acquire them.
Understanding the Inputs
Average Revenue Per User (ARPU): This is your total Monthly Recurring Revenue (MRR) divided by your total number of active customers. If you have different pricing tiers, this is the weighted average of what a typical user pays per month.
Gross Margin (%): SaaS revenue isn't pure profit. You have costs to deliver the service, such as hosting (AWS/Azure bills), third-party API costs, and customer support salaries. The gross margin is the money remaining after these Cost of Goods Sold (COGS) are paid. High-performing SaaS companies usually see margins between 80% and 90%.
Monthly Churn Rate (%): This is the "leaky bucket" metric. It represents the percentage of your customer base that cancels their subscription in a given month. Even small changes in churn have exponential effects on CLV. A churn rate of 5% implies an average customer lifespan of 20 months (1 / 0.05), whereas a churn rate of 2% implies a lifespan of 50 months.
The SaaS LTV Formula
While there are complex formulas that account for expansion revenue and discount rates, the standard, effective formula for most SaaS businesses used in this calculator is:
Imagine a B2B SaaS company with the following metrics:
They charge an average of $150 per month (ARPU).
Their server and support costs leave them with an 85% Gross Margin.
They experience a 3% Monthly Churn Rate.
Using the calculator above, the calculation would be:
($150 × 0.85) / 0.03 = $4,250 CLV
This means that although the customer only pays $150 a month, the business can expect that customer to be worth $4,250 over their estimated 33-month lifespan. This company could theoretically afford to spend up to $1,400 (one-third of the LTV) to acquire that customer and still remain healthy.