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Idiots Guide To Life Time Customer Value

What is Customer Lifetime Value and Why Is It Important?

nb: this is a longish post so if you just want the results skip to the bottom 🙂

Lifetime Value (LV) helps to determine the economic value a customer brings over their “lifetime” with the business.  At the heart of understanding LV lies the recognition that a customer does not represent a single transaction but a relationship that is far more valuable than any one-time exchange.

However, LV is not about any one customer; it is about stepping back and taking a look at your customer base as a whole — understanding that while some never return and some never leave, on average there is a typical customer lifetime and that lifetime has a specific economic value.

Understanding the Lifetime Value of your customers is incredibly important for customer service professionals and for businesses of all types. Why?

Because if you don’t know what a client is worth, you don’t know what you should spend to get one or what you should spend to keep one.

For instance, if it costs you £100 to acquire a customer, and your customer’s LV is £75, then we’ve got a MAJOR problem.

Understanding LV allows you to drill down and understand the economic value of each customer, so you can make sound decisions about how much to invest in acquisition and retention.

Why a Non-Geek Guide to Customer Lifetime Value?

The Customer Lifetime Value calculation can be an extremely complex undertaking. Both correctly identifying the underlying components and calculating the end result have been the focus of numerous academic studies. To say that it can be complicated would be an understatement. Here are three examples of CLV calculations from the academic literature.

EquationWhile anyone with a graduate course in finance or statistics can probably hack their way      through the first two formulas, the third looks like something pulled off one of the whiteboards from the set of The Big Bang Theory.

I’ve been exposed to some fairly daunting business math in my day, and if I had been shown the last formula out of context I wouldn’t have known if it was designed to calculate Customer Lifetime Value or the quantization of energy.

So, if calculating Customer Lifetime Value is so mathematically challenging, do we have to go full geek to effectively use LV in our businesses?

The answer is no.

While it is smart to be cautious about using nonscientific evidence for analysis, often statistically sound approaches are not feasible. Whether due to your budget, time, or data constraints, sometimes the back of the napkin is all you have.

Yet often the back of the napkin is good enough. When people apply common sense and experience to non-scientific evidence, the process can often yield extremely positive results.

Much of the reason for this non-geek guide to Lifetime Value is the understanding that, even if you don’t whip out the slide rules and try to create a scientifically sound model, spending time on each component of the LV model can be incredibly instructive.

Whether you are measuring the value of customers in your department, your small business, or even your blog, just thinking about LV and its parts can help you refine your marketing and retention efforts.

Break It Down Neil!

Let’s begin by taking a look at the major components of Lifetime Value.

Calculating The Profit of an Average Transaction

The tendency when thinking about the lifetime value of a customer is to focus on the revenue the customer brings in over their lifetime. However, focusing on revenue will almost always overstate the value of the customer. The more accurate way to measure is to focus on what is known as the Unit Contribution Margin, which we’ll call marginal profit for short.

Calculating marginal profit is simple in many industries.

coffee cupFor instance, if a Starbucks customer buys a £3.00 latte, that transaction has costs associated with it. The milk, the cup, the coffee, the lid, and the flavoring all add to a variable cost that is incurred for that latte transaction.

Let’s assume those costs are £1.00.

It’s obvious that if you wanted to calculate the Customer Lifetime Value of a Starbucks customer, you would want to use the £2.00 of marginal profit as your metric, not the £3.00 of revenue.

Using revenue overstates what you made on the transaction. The true economic value of the transaction is £2.00.

The next step is figuring out the average of all of the company’s transactions.

Not everyone buys the £3.00 latte. Some buy the £2.00 muffin, others buy the £1.50 straight coffee.

The trick for Starbucks is figuring out how many of each and calculating an average profit profile per customer.

In the end, Starbucks would hopefully come up with something like: the average Starbucks customer spends £4.30 at an average cost per transaction of £1.10 — thus the marginal profit for an average transaction is £3.20. (PS. All of these numbers are made up to illustrate.)

It is important to note that in this case, labor (their employees) is not a variable cost.

Ignoring anomalies like sending staff home on a slow day, Starbucks’ labor is constant. They are paying the staff whether that cup of coffee is purchased or not. Thus, it does not contribute to marginal profit.

Labor would be included, however, if labor costs vary based on whether a service is performed or a product is sold. For instance, maid services that pay only per job or spas that pay per service performed. Product companies can also have variable “labor” per unit, if for instance, there are commissions paid on sales.

But I work for myself…

For consultants or solopreneurs, the calculation can be tricky. If your hourly rate is £50 and you provide 10 hours of service, £500 will be your revenue, and £500 will be your cost. How do you value the cost of your time compared to your hourly rate?  Use opportunity cost.

The presumption is that you charge a different hourly rate yourself than you would presumably receive as an employee. Calculate what hourly rate you would be earning in an alternative employment situation and use that opportunity cost as the cost of your time. If you made £20/hour at your last job or you think that’s about what you would get if you sought employment, then use that number as your cost.

Since your primary cost is the value of your time, you have to determine the opportunity cost of taking that hour away from other economic alternatives and spending it on that client. It might be a wild guess, but it can still be instructive.

What is Your Customer’s Lifetime? (Customer Retention Rate)

To understand LV, you must know the lifetime of your customer. Now, we will have to do a little math here, but it is just dividing a couple of numbers, so it still qualifies as non-geek ;-)

Calculating customer lifetime can actually be fairly simple if you have the data. The first step is to calculate your customer retention rate, and then do some simple division to get your customer lifetime.

To calculate your retention rate, take the number of customers from last year who are still customers this year — that is your retention rate. If you had 100 customers last year and 45 are still doing business with you this year, then your retention rate is 45%. (For a more sound approach, you would want to track it over multiple years and take an average.)

Once you have the retention rate (RR), then it is easy to determine customer lifetime. Simply apply this formula:

Customer Lifetime = 1/(1-retention rate)

In this case, customer lifetime = 1 / (1 – .45) = 1.5 | Your customer lifetime is 1.5 years.

An important consideration is whether your business has time-bound contracts with customers. Mobile phone companies and fitness clubs will have different characteristics to consider when approaching this metric than businesses that don’t have contract periods as part of their customer relationship.

The Last Piece is Your Discount Rate…

In non-geek, the discount rate is the interest rate you borrow money at in your business, and it is essential to knowing the true value of your customer’s future cash flows. The concept is based on the time value of money, the premise that a pound today is worth more than a pound tomorrow.

If the lifetime value of a customer is fairly short, the calculation, while methodologically sound, might not be material. However, if you have a long time horizon, the time value of money is a real consideration. To make this real for you ask yourself, would you rather have a £100 from your customer today or twenty years from now? Of course, we all know the answer to that. 20 years from now you’ll be lucky if £100 buys you a round of drinks at the pub.

For our back of the napkin purposes, you are probably safe to ignore the discount rate in calculating your Customer Lifetime Value. Just understand that the longer you calculate your customer lifetime to be, the more important the discount rate becomes and the more inaccurate your model becomes when you ignore the rate.

Now That You Have the Parts: Understanding Customer Segmentation

At the heart of customer segmentation is the belief that all customers are not created equal and that understanding the differences among customer segments is key to effectively acquiring and retaining customers.

Depending on the nature of the business, customer segmentation can require some serious mathematical analysis to be done properly. However, in the spirit of our idiot guide, we will approach customer segmentation by asking one simple question:

How would I group my customers if I wanted to customize my marketing, retention, or product offerings?

Customer segmentation can occur on many bases: demographic, psychographic, behavioral, and so forth. The key is knowing which breakdown is most valuable for your business.

AppleThe most logical first step is to break down the segments based on differentiated products or services. For instance, say your department provides support services both to small businesses and individuals. If the offerings to these two types of customers are distinct, you would probably want to segment your customer base into business customers and individual customers. In other words, you would calculate a Customer Lifetime Value for each segment.

If your business does not have obvious divisions like the one above, you should consider what factors have the most impact on customer buying characteristics — or segment on behavior itself. In the first case, you would simply ask yourself what impacts purchasing. Do men and women have different buying patterns? Is household income important to purchasing behavior? Is there a psychographic factor like “plays golf more than twice a week” that really differentiates activity?

Sometimes behavioral data, how the customer behaves with your business, is the best way to segment. Do you retain customers who buy your premium product at a significantly greater rate than all others? Is three purchases the magic number that makes a customer stick significantly longer? Do customers who remain after 9 months increase their average lifetime purchases by more than double?

As you can see, your ability to segment your customer base is directly related to what you know about your customers (or are willing to find out). However, in the spirit of our non-geek approach, let me advise you to start with your gut. If you know your business, you probably have an innate sense of what types of customers act what way. Try to fill in the blanks on this statement:


Customers who ___________ tend to ___________.

For example… Customers who are over 55 tend to retain longer. Customers who subscribe to the newsletter tend to have much higher average purchases.

Go with your instinct first, then dig into your data to try to prove or disprove your hunch.


Technically, the calculation of Lifetime Value should include acquisition and retentions costs. To know a customer’s true lifetime value, you need to subtract the cost to acquire and keep that customer. However, I find it helpful to calculate LV without acquisition and retention costs. To me, this is the best way to isolate variables and to see their effect when using the back of the napkin approach.

This is similar to the EBITDA concept in accounting — figuring out your earnings before taxes, depreciation, and amortization. It gives you a sense of the purely operational figure, outside of the other inputs.

Let’s start with acquisition…

What Are Your Customer Acquisition Costs?

Knowing what it costs to get a customer in the door is one of the most valuable pieces of information any business owner can have. Customer acquisition costs are generally the easiest of the metrics to compute. While each industry and business is different, the broad brush approach is simply to take your marketing expenditures for a period and divide by the number of new clients in the same period.

Try to find a period that is relevant for your business based on how you approach your marketing, and how much lag time there is in your business between marketing and acquisition.

If you are a small business / solopreneur, you would need to measure time spent on blogging, social media, or content creation. If your web site and social media are your only sources of new customers, you would take the time spent on these items in a month, multiply it by your hourly rate, and calculate your marketing cost.

Whatever method is appropriate for your business or department, the goal is to figure out exactly what it costs to acquire a customer.

What Are Your Retention Costs?

If a customer stays with you, on average, for 2.5 years, what are you spending to keep them coming back? Most companies put money into retaining customers, and much of the focus of customer service and customer experience writing is about the retention of customers already acquired. Calculating these costs can be a challenge, because there is a much greater mixture of hard costs and soft costs in this area than are found in the marketing bucket.

Start with any obvious hard costs: perks for longevity, discounts for existing customer, freebies for certain buying behaviors, etc. These are the costs that can usually be  calculated easily and accurately. When making the calculation though make sure to average the cost out across the entire customer base.

In other words, if you gave $1,000 in longevity discounts last month, but only 25 of your 5,000 customers received the discount, you would still spread that cost across your entire database of 5,000, not just the 25 who received the discounts.

Soft costs are trickier. If you add a part-time person so that your manager can focus on customer outreach, is that a retention cost? If you send your sales staff to a customer service seminar, is that a retention cost? If you redesign the help section on your web site, is that a retention cost? While it can be difficult to determine how to treat soft costs when looking at retention, it is well worth the time to evaluate.

One question that should help determine if a soft cost belongs in the retention “bucket” is this: what is our primary reason for incurring these costs? If customer satisfaction, retention or any similar customer service-based sentiment is the primary reason, it is probably safe to consider the expenditure a retention cost.

A final note on acquisition and retention: If you are segmenting your customer base, you will need to apply these calculations for each segment, not the customer base as a whole. In fact, these acquisition and retention analyses truly show their power when applied to meaningful customer segments, as you will see when we begin…

Finally The End….

Skip Here If You Just Want The Results

Now that you have your LV and a grasp on your marketing and retention costs, it is time to start putting the two together. Even when taking the scientific approach (which we are not), this part of the process can involve a good bit more art than science. A few extremely hypothetical (and yes, very simplistic) examples will hopefully get the wheels spinning on how to approach this final phase in your specific situation.

While we are only going to break down acquisition and retention, there is a third strategy that is important to bear in mind: customer expansion. Instead of purging customers with low or negative CLVs, you attempt to expand your business with them and help them become more valuable customers.


One of our clients who owned a fashion retail shop determined that their customer base broke down quite naturally by geography. We determined that most of their customers came from two postcodes, one to the east and one to the west, and accordingly, we decided to calculate the LV separately for each postcode. What we discovered was that the LV for the east customers was 4 times the CLV for the west customers.

Once we dug into their stats, we found out how important this differentiation was. The East postcode was 30% of their customer base but 80% of their profit. The West represented 70% of their customer base and 20% of their profit.

The fashion shop had been spending their marketing budget evenly east and west prior to our intervention.Now they spend money according to the return it makes, much smarter!


We started a rewards programme to help retain patients for a dentist client of ours. Patients could earn points for various activities, from receiving services, filing their own insurance, or referring other patients. These points translated into straight money off. After a year using the points program, the chiropractor found that it was being used heavily and, when averaged out among his entire customer base, represented almost 10% of LV…. not bad, not bad at all.

Unfortunately, the increase in retention since starting the programme (other factors assumed constant) had only been 2-3%. What we found is that the incentive programme had not extended the life of the majority of customers; most tend to use the services until they no longer need it or move away. The programme had simply helped keep some people that previously would have defected to another dentist due to dissatisfaction with the service, the majority of whom could probably be saved by implementing better service systems. Understanding LV had enabled us to see that the programme had a cost far greater than its long-term economic value, on the face it of though it looked like it had worked and in fact our client loved it… when we did the analysis though we had to tell him to stop.


Of all the many exercises in a business, computing the Lifetime Value of your customers can be one of the most eye-opening and rewarding. Hopefully, the point has been well-made by now that knowing the lifetime value of your customers can help you truly understand the value of your marketing and retention expenditures.

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