Understanding the LTV/CAC ratio is an essential part of managing a successful e-commerce business, and it is especially important on Amazon. Sellers should analyse this calculation before expanding and investing heavily in a product. It’s a best practice to ensure each sale generates enough revenue to cover fixed costs (including Amazon fees and COGs) and yields sufficient profit for future growth.
Without a full understanding of how much each customer is worth, as well as how much you should invest in acquiring that customer, strategic marketing efforts cannot be maximised.
In this article, we will break down what CAC and LTV are, how to calculate them, and practical strategies to optimize them.
What is Customer Acquisition Cost (CAC)?
CAC represents the total cost involved in acquiring a new customer. This cost includes all marketing and sales expenses divided by the number of new customers acquired during a specific period.
Example: If a company invests $10,000 in marketing and sales in one month and acquires 50 new customers, the CAC is: CAC = $10,000 / 50 = $200
A high CAC may indicate that the company is spending too much to attract customers, while a low CAC suggests that marketing efforts are efficient and more cost-effective.
Another way to calculate CAC is by using the following formula:
CAC = CPC / CVR
Where CPC is the Cost Per Click and CVR is the sales conversion rate. This formula allows you to calculate the CAC for each product (ASIN) more precisely by considering the specific performance of your advertising campaigns.
Example:
- CPC: $2
- CVR: 5% (or 0.05 in decimal terms)
CAC = $2 / 0.05 = $40
This means a seller needs to invest $40 to acquire a new customer.
What is Customer Lifetime Value (LTV)?
LTV is a metric that estimates the total value a customer brings to the company throughout their entire relationship with the business. This value helps you understand which customers are most valuable and how to best allocate resources to maximize profits.
Example: If a customer’s average purchase value is $50, they make 5 purchases per year, and they remain a customer for 3 years, the LTV is: LTV = $50 x 5 x 3 = $750
The Relationship Between LTV and CAC
The ratio between LTV and CAC (LTV:CAC) is a crucial indicator of a company’s financial health and growth potential. Focusing on the LTV/CAC ratio can help sellers identify potential pitfalls in the expansion process and build scalability strategies on a solid foundation. A good LTV:CAC ratio indicates that the company is generating more revenue from each customer than it costs to acquire them.
LTV:CAC Ratio = $750 / $200 = 3.75:1
This means the company earns approximately 3.75 times more than it costs to acquire each customer.
What Different LTV:CAC Ratios Indicate
- LTV:CAC = 1:1: Indicates the company is breaking even; the value customers bring equals the cost to acquire them. In practice, this can mean a loss when other operational costs are considered.
- LTV:CAC < 1:1: The company is spending more to acquire customers than the value they bring. This is unsustainable long-term and requires an urgent review of acquisition and retention strategies.
- LTV:CAC > 1:1: The company is generating more value from customers than it costs to acquire them. A ratio of 3:1 is generally considered healthy, indicating good profit potential and the ability to reinvest for further growth.
Factors that Affect the LTV:CAC Ratio
- Purchase Frequency: The more frequently customers buy, the higher the LTV.
- Recurring Business Model: Subscriptions or loyalty programs can significantly increase LTV.
- Average Order Value (AOV): Higher-ticket products can increase LTV.
- Retention Rate and Churn: High retention and low churn rates increase LTV.
Calculating CAC and LTV Using Amazon Data
To calculate CAC and LTV based on data from Amazon Seller Central and Amazon Ads, follow the steps below:
Calculating CAC
- Gather Marketing and Sales Expense Data:
- Access Amazon Seller Central.
- Go to the reports section and retrieve data on your advertising spend (Amazon PPC).
- Include all marketing expenses, such as promotions, paid campaigns, and other customer acquisition activities.
- Determine the Number of New Customers:
- Use the sales reports in Seller Central to identify the number of new customers acquired in a specific period.
- Calculate CAC:
- Use the CAC formula mentioned earlier with the collected data.
Example:
- Marketing and sales expenses for the month: $10,000
- New customers acquired in the month: 100
CAC = $10,000 / 100 = $100
Calculating LTV
- Determine Average Order Value (AOV):
- Access the sales report in Amazon Seller Central and calculate the average transaction value.
- Calculate Annual Purchase Frequency:
- Identify the average number of purchases a customer makes in a year using historical sales data.
- Determine Average Customer Relationship Length:
- Use customer retention data to estimate how many years, on average, a customer continues to buy from you.
- Calculate LTV:
- Use the LTV formula with the collected data.
Example:
- Average purchase value: $50
- Number of purchases per year: 4
- Average relationship length: 3 years
LTV = $50 x 4 x 3 = $600
Strategies to Optimize the LTV:CAC Ratio
By breaking down the calculation formula, we can easily identify the levers that impact your LTV/CAC ratio:
- New-to-Brand Customers: Increasing the proportion (and number) of New-to-Brand customers will benefit your ratio. However, simply investing more to acquire them won’t necessarily help profitability. It is crucial to analyse your ad campaigns targeting new users, such as competitor conquesting, and double down on the ones that perform best. If you haven’t already, experiment with upper-funnel Amazon DSP campaigns and test different options to see what works. For any campaign with room for improvement, refine the creatives, audience targeting, and/or keyword targets, and monitor for a positive impact.
- Orders Per Customer: If you can encourage more orders per customer, it will proportionally increase your LTV/CAC ratio. Two ways to achieve this are:
- Run ad campaigns targeting existing customers. If you don’t want to increase ad spend, you can shift the budget from more general campaigns to those focused on your existing customer base.
- Lower your product prices. However, this will reduce your Average Order Value, which negatively impacts the ratio. Always monitor how price changes affect buyer behaviour.
- Average Order Value (AOV): A higher AOV leads to a higher LTV/CAC ratio, as long as the number of orders per customer remains stable. Besides raising prices (which could hurt your orders per customer), you can increase basket size by implementing cross-selling and upselling strategies. Repeat customers who already trust your brand are a prime audience for ad campaigns promoting your lesser-known ASINs.
- Investing in Paid Advertising: Increasing your ad budgets is the most direct lever for getting more impressions. But if you do this without a real strategy, you have little chance of improving your LTV/CAC ratio. More budget can increase volume and be a great sales driver, but it’s how and where you leverage that budget that will make a real impact on your profitability.
These examples show the importance of understanding how these metrics interact and how analysing your LTV and CAC can show you where adjustments in your advertising campaigns will drive positive change.
Understanding and optimising CAC and LTV is essential for the long-term success of any business on Amazon. Furthermore, CAC and LTV align perfectly with the Amazon Flywheel philosophy. By implementing the strategies discussed and monitoring these indicators, sellers can not only improve their profitability but also ensure sustainable and robust growth.
