Question 1

What is customer lifetime value, and how is it actually calculated?

Accepted Answer

The total profit you expect from a customer over the whole relationship. It is the number that determines **how much you can afford to pay to acquire one** — and it is calculated wrongly more often than almost any other marketing metric.

**The basic formula**, for a subscription business:

**Average revenue per customer per period × gross margin ÷ churn rate.** If a customer pays £50 a month at 70% margin and 5% monthly churn, lifetime value is £50 × 0.7 ÷ 0.05 = **£700**.

**The mistakes that make it meaningless:**

**Using revenue instead of gross profit.** Lifetime *revenue* is not lifetime *value*. Costs of goods, payment processing, support and delivery must come out — and for some businesses that halves the figure.

**Ignoring the time value of money.** Profit arriving in year five is worth less than profit today, and for a business that must fund acquisition upfront, **cash timing matters more than the total**.

**Averaging across very different customers.** A single blended figure hides that one segment is profitable and another destroys value. Calculate it **by segment and by acquisition channel**, because that is what changes decisions.

**Assuming churn stays constant.** Churn is usually highest early and falls as customers mature, so a flat rate understates the value of survivors and overstates that of new joiners.

**Projecting too far.** A ten-year horizon on a two-year-old business is fiction. Cap it at a defensible period.

**Forgetting that it is a forecast**, not a measurement.

**What it is actually for.** The ratio of lifetime value to **customer acquisition cost** is the central unit economic. A commonly cited healthy benchmark is around 3:1, with the caveat that a very high ratio frequently indicates **underinvestment in growth** rather than excellence.

**Payback period matters more for survival.** How many months until a customer repays their acquisition cost determines how much cash you must hold. A business with excellent lifetime value and an eighteen-month payback can still fail.

**Use cohorts** rather than a single number, and revise as real data arrives.

Question 2

What is customer acquisition cost and how do you work out payback?

Accepted Answer

Customer acquisition cost (CAC) is what it costs, on average, to acquire one paying customer. Payback period is how long that customer takes to earn the money back. Calculating CAC. Total sales and

Question 3

What is churn and why does it matter more than growth?

Accepted Answer

Churn is the rate at which customers stop paying you over a period. It is the counterweight to acquisition, and it determines whether growth compounds or leaks away. Two measures, and the difference

Question 4

How do loyalty programmes actually make money?

Accepted Answer

Rarely through the loyalty itself. Most programmes earn through a combination of margin funded by suppliers, changed purchase behaviour, unredeemed value, and — for the largest schemes — selling the

Question 5

How to measure marketing automation success?

Accepted Answer

Measuring marketing automation success involves tracking metrics like lead conversion rate, customer engagement, ROI, sales cycle length, and customer retention. These insights help optimize strategies for better results.

Question 6

What is the difference between a customer persona and a segment?

Accepted Answer

A segment is a group defined by shared measurable characteristics. A persona is a narrative representation of a typical person within a segment. They serve different purposes, and substituting one

Question 7

What is a cohort analysis, and why is it better than an average?

Accepted Answer

Grouping users by when they started and tracking each group separately over time — which reveals changes that overall averages actively conceal. The problem with aggregate numbers. Total revenue,

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