Imagine you run an online clothing store. You spend money on ads to bring new customers to your website. Some people visit, some make a purchase, and a few come back to buy again. But how do you know if the money you spend on getting new customers is actually helping your business grow?
Two numbers can help you understand this: Customer Acquisition Cost (CAC) and Customer Lifetime Value (CLV). CAC tells you how much you spend to get one new customer. CLV tells you how much money a customer spends at your store over time.
Understanding these two numbers can help you make better decisions about how much to spend on marketing and how to encourage customers to buy from you again.
What Is Customer Acquisition Cost (CAC)?
Customer Acquisition Cost, or CAC, is the amount you spend to get one new customer.
This includes the money you spend on ads, marketing campaigns, and other activities that help bring customers to your business.
How Do You Calculate CAC?
To calculate your Customer Acquisition Cost, simply divide your total marketing spend by the number of new customers you acquire from that spend. For example, if you spend ₹10,000 on ads and get 100 new customers, you have spent ₹100 to acquire each customer.
So, your Customer Acquisition Cost is ₹100 per customer. This means you spent ₹100 to get each new customer. Knowing this number helps you understand how much it costs to grow your customer base.
However, getting customers at a low cost does not always mean your business is doing well. If most customers buy only once and never return, you may need to keep spending money to find new buyers.
What Is Customer Lifetime Value (CLV)?
Customer Lifetime Value, or CLV, tells you how much money a customer spends on your products over the time they continue buying from your business. For example, imagine a customer buys a T-shirt worth ₹1,000 from your store. Over the next two years, they place four more orders worth ₹1,000 each.
That customer has spent ₹5,000 at your store. This is their total spending over that period. It is not your profit, because you still need to pay for the products, delivery, and other business expenses.
How to estimate CLV:
CLV = Average Amount Spent Per Order × Number of Orders
For example, if a customer spends ₹1,000 per order and places five orders, their total spending is ₹5,000.
This simple calculation helps you understand why repeat customers matter. When customers return to buy again, they can bring more revenue to your business without you having to find a new customer for every sale.
CLV vs CAC: What Is the Difference?
Both numbers help you understand your business, but they answer different questions.
| Customer Acquisition Cost (CAC) | Customer Lifetime Value (CLV) |
| How much does it cost to get a new customer? | How much does a customer spend over time? |
| Helps you understand your marketing costs | Helps you understand the value of your customers |
| Focuses on getting new buyers | Focuses on purchases made over time |
Let’s take a simple example.
You spend ₹200 to get a new customer. That customer spends ₹1,000 at your store over time.
Your CAC is ₹200, and your CLV is ₹1,000.
Looking at both numbers gives you a better idea of how much you spend to get a customer and how much money that customer brings to your business.
Why Does the CLV-to-CAC Ratio Matter?
The CLV-to-CAC ratio compares how much a customer spends with how much it costs to get them.
Formula:
CLV-to-CAC Ratio = Customer Lifetime Value ÷ Customer Acquisition Cost
Let’s say it costs you ₹500 to get a new customer, and that customer spends ₹1,500 at your store over time.
Your CLV-to-CAC ratio is 3:1.
This means the customer spends ₹3 for every ₹1 you spend to acquire them.
A 3:1 ratio is often used as a general benchmark. However, it does not mean you earn ₹3 in profit for every ₹1 spent on marketing. You still have to pay for products, delivery, and other business expenses. The main purpose of this ratio is to help you understand whether the money you spend to get customers is bringing in enough revenue over time.
If customers spend very little after you acquire them, you may need to review your marketing costs or find better ways to encourage repeat purchases.
How Can E-commerce Brands Improve Their CLV-to-CAC Ratio?
Businesses can work on two things: spending money more wisely to get new customers and encouraging existing customers to buy again.
Here are four ways to do this.
1. Find Out Which Marketing Efforts Bring Customers Back
Not every customer will buy again, and not every marketing campaign will bring the same results.
For example, you may run two ad campaigns. Both bring in 100 new customers, but customers from the first campaign return to buy again more often than those from the second.
By comparing the results, you can understand which campaign brings customers who are more likely to return.
This helps you decide where to spend your marketing money.
2. Stay in Touch After the First Purchase
Getting a customer to place their first order is only the beginning.
Think about a customer who buys a face cream from your online store. After a few weeks, you could send a helpful reminder to replenish the product, if the timing makes sense.
Similarly, you can send order updates, delivery notifications, and relevant offers through channels such as WhatsApp, SMS, or email.
The idea is to stay connected with customers and give them a reason to return when they need your products.
3. Send Messages That Match Customers’ Needs
Imagine you run an online store that sells clothing, shoes, and accessories. A customer who has just placed their first order may need a different message from someone who buys from your store every month. Sending the same offer to everyone may not be useful. This matters because customers do respond to relevant offers. McKinsey found that 65% of customers consider targeted promotions an important factor when deciding whether to buy from a brand. (Source: McKinsey&Company)
For example, you could share new arrivals with regular shoppers or send a reminder to customers who have not purchased in a while. A first-time customer could receive a welcome message, while a repeat customer could receive an offer based on products they already buy.
The idea is simple: the more relevant the message, the more useful it can be to the customer. And when customers have more reasons to return, they can generate more value for the business over time.
4. Track How Often Customers Buy Again
Getting new customers is important, but you should also know how many existing customers return to make another purchase.
For example, if 100 customers buy from your store for the first time and 30 of them return to place another order, you know that 30% of those customers made a repeat purchase during the period you measured.
Tracking this number over time helps you understand whether more customers are returning or whether you need to improve your follow-up communication and customer experience.
You can also look at how much customers spend, how often they order, and how many stop buying from your store.
Together, these numbers help you understand whether your business is building lasting customer relationships.
How Retaint Helps Businesses Encourage Repeat Purchases
Getting new customers takes time and money. Helping existing customers return to your store is another way to grow your business. Retaint helps e-commerce businesses manage customer engagement and plan communication across channels such as WhatsApp, SMS, email, and push notifications.
For example, a business can use customer information to identify first-time buyers, regular customers, and people who have not purchased recently. It can then plan relevant messages for each group. These messages could include product updates, useful reminders, offers, or recommendations based on a customer’s previous purchases.
By bringing customer information and communication together, Retaint helps businesses build better customer relationships and support repeat purchases.
Bringing Customer Acquisition and Retention Together
Getting new customers helps your business grow. Getting those customers to return can help you grow further.
CAC tells you how much it costs to get a customer, while CLV helps you understand how much that customer spends over time. Looking at both numbers gives you a clearer picture of your marketing efforts.
For e-commerce businesses, the goal is not just to bring more people to their stores. It is also to give customers good reasons to come back.
When businesses understand what they spend to acquire customers and what those customers bring in over time, they can make better decisions about marketing, customer communication, and long-term growth.
