How to Calculate Customer Lifetime Value (CLV)

To calculate customer lifetime value (CLV), multiply how much a customer spends per year by how many years they typically stay, then multiply by your gross margin to turn revenue into profit: CLV = average order value × purchases per year × gross margin × lifespan in years. If you know your churn rate rather than lifespan, use lifespan ≈ 1 ÷ churn rate. The result tells you what a typical customer is worth, and therefore how much you can sensibly spend to win and keep one.

This guide covers three formulas, from simplest to most useful, with worked examples for three very different businesses. You can follow along in the customer lifetime value calculator.

Why CLV matters

CLV turns vague questions into numbers you can decide with:

• How much can we spend to win a customer? If a customer is worth $300 in gross profit, spending $350 to acquire them loses money.
• Is it worth improving retention? If customers stayed one year longer, how much more would each be worth?
• Which customers deserve extra attention? Segments with higher CLV justify more service, better onboarding or a dedicated contact.

The inputs you need

Input	What it means	Where to find it
Average order value (AOV)	Revenue per purchase	Total revenue ÷ number of orders in a period
Purchase frequency	Purchases per customer per year	Number of orders ÷ number of unique customers, per year
Gross margin	Share of revenue left after direct costs	(Revenue − cost of goods or delivery) ÷ revenue
Lifespan	How long a typical customer stays	From history, or estimated as 1 ÷ annual churn
Churn rate	Share of customers lost per period	Customers lost ÷ customers at start of period

If you are not sure how to measure churn, see how to calculate churn rate. To see how many customers buy more than once, see how to calculate repeat purchase rate.

Formula 1: Simple revenue CLV

CLV (revenue) = AOV × purchases per year × lifespan in years

This is the quickest version. It shows how much revenue a customer brings, but not how much profit, which can be misleading for low-margin businesses.

Formula 2: Margin-based CLV (recommended)

CLV (gross profit) = AOV × purchases per year × gross margin × lifespan in years

This is the version to use for most decisions. Comparing revenue with acquisition costs makes customers look more valuable than they are; comparing gross profit is closer to reality.

Formula 3: Churn-based CLV (for subscriptions)

CLV = gross profit per customer per period ÷ churn rate per period

This works when customers pay regularly and you know the churn rate. It relies on the fact that, with a constant churn rate c per period, the average customer stays 1 ÷ c periods. Use the same period for both inputs: monthly profit with monthly churn, or annual with annual.

Worked example 1: A café

Assumptions for a neighbourhood café (example figures):

• Average spend per visit: $7.50
• Visits per regular customer per year: 60 (a bit more than once a week)
• Gross margin: 65%
• Regulars typically stay about 3 years (people move, change jobs, change habits)

Calculation:

1. Revenue per year: $7.50 × 60 = $450
2. Gross profit per year: $450 × 0.65 = $292.50
3. CLV (gross profit): $292.50 × 3 = $877.50
4. CLV (revenue): $450 × 3 = $1,350

What it means: a regular is worth almost $900 in gross profit. A loyalty card that costs a few dollars per completed card, or a free pastry for a new regular, is small compared with that, provided it actually makes people come back.

Worked example 2: A subscription business

Assumptions for a monthly subscription box (example figures):

• Price: $30 per month
• Gross margin: 45% (after product, packaging and shipping)
• Monthly churn: 6%

Calculation:

1. Gross profit per month: $30 × 0.45 = $13.50
2. Average lifetime: 1 ÷ 0.06 ≈ 16.7 months
3. CLV = $13.50 ÷ 0.06 = $225

Now see what retention is worth. If monthly churn falls from 6% to 4%:

• Lifetime: 1 ÷ 0.04 = 25 months
• CLV = $13.50 ÷ 0.04 = $337.50

Two percentage points less churn raises the value of every customer by half. That is the kind of figure that justifies investing in onboarding or customer service.

Worked example 3: A small agency

Assumptions for a web design agency (example figures):

• Average project value: $6,000
• Projects per client per year: 1.5 (a main project plus smaller follow-ups)
• Gross margin after freelancer and tool costs: 50%
• Clients typically stay 4 years

Calculation:

1. Revenue per year: $6,000 × 1.5 = $9,000
2. Gross profit per year: $9,000 × 0.5 = $4,500
3. CLV (gross profit): $4,500 × 4 = $18,000

For a business like this, CLV makes the case for proper account care: regular check-ins, a customer onboarding checklist for every new client and quick follow-up after each project.

Comparing the three examples

	Café	Subscription	Agency
Revenue per year	$450	$360	$9,000
Gross margin	65%	45%	50%
Lifespan	3 years	~1.4 years	4 years
CLV (gross profit)	$877.50	$225	$18,000

The subscription box has the lowest CLV mainly because of churn, not price. That pattern is common: lifespan is often the input with the biggest effect.

From CLV to decisions

Acquisition budget

Compare CLV with your customer acquisition cost (CAC), the total marketing and sales spend divided by new customers won. The ratio of the two, and how long it takes to earn back CAC, are covered in our guide to the LTV to CAC ratio.

Retention investment

Use CLV to price retention ideas. If an onboarding improvement costs $2,000 and is expected to keep a few extra subscription customers per month, each worth $225, you can estimate how long it takes to pay back.

Segments

Calculate CLV separately for customers from different channels (referral, search, social, events) or products. If referred customers stay twice as long, referral programs deserve more budget.

Common mistakes

• Using revenue instead of margin. It overstates value, especially for low-margin businesses.
• Mixing periods. Monthly profit divided by annual churn gives nonsense. Keep periods consistent.
• Using an optimistic lifespan. For a young business, you do not yet know how long customers stay. Start conservatively and update.
• Ignoring the cost to serve. If some customers need far more support than others, their real value is lower. Include major service costs in margin where you can.
• Treating CLV as precise. It is an estimate for comparing options, not a guaranteed figure. Round generously and focus on direction.

A note on discounting

Advanced CLV models discount future profit, because a dollar next year is worth less than a dollar today. For short lifespans and small businesses, the simple formulas above are usually enough. If customers stay many years and you are making large investment decisions, consider applying a discount rate or asking your accountant to help build the model.

Your next step

Gather four numbers from your records for the last twelve months: average order value, purchases per customer, gross margin and churn (or a lifespan estimate). Enter them in the customer lifetime value calculator, then change the churn input by a few points to see what better retention would be worth. That figure is your budget for the customer retention strategies you choose to try.