LTV:CAC Ratio Calculator

LTV:CAC ratio measures the relationship between the lifetime value of a customer and the cost to acquire them. It is the most important unit economics metric for any growth-stage business because it answers a fundamental question: is your customer acquisition profitable?

The formula is: LTV:CAC Ratio = Customer Lifetime Value / Customer Acquisition Cost

For example, if your average customer generates $300 in lifetime revenue and it costs $100 to acquire them, your LTV:CAC ratio is 3:1. This means every dollar spent on acquisition returns three dollars in customer value. At this ratio, you have healthy margins for operating costs and profit.

LTV:CAC is critical for Shopify merchants because it tells you how much you can afford to spend on Facebook ads, Google Shopping, influencer partnerships, and other acquisition channels while remaining profitable. Without this metric, you are flying blind on your marketing budget.

The 3:1 LTV:CAC ratio is widely regarded as the benchmark for healthy, sustainable growth. But why exactly 3:1? The answer comes down to how revenue from each customer gets allocated.

At a 3:1 ratio, your customer lifetime value splits roughly into thirds:

Below 3:1, the operating cost layer starts compressing your profit margin. At 2:1, half of LTV goes to acquisition, leaving only 50% for operations and profit combined, which is razor thin for most ecommerce businesses. At 1:1, there is nothing left after acquisition costs.

Above 5:1, you are generating strong returns per customer, but the question becomes: could you acquire more customers by spending a bit more? A 5:1+ ratio often indicates untapped growth potential. The most efficient scaling happens in the 3:1 to 5:1 range.