The short answer
Customer lifetime value (CLV, often written LTV) is the gross margin a customer account brings in over the whole relationship. In B2B the simple formula is average annual revenue per account x gross margin x average lifetime in years. If you track churn, use margin per period divided by churn rate for the same period: an annual churn of 20% implies an average lifetime of five years. An account paying 24,000 euros a year at a 40% margin that stays five years is worth 48,000 euros in margin. CLV only means something next to the cost of winning the account (CAC): David Skok's widely used SaaS guideline asks for an LTV:CAC ratio above 3 and CAC recovered within 12 months. Work it out per segment, because the average hides the accounts that are worth most.
The formulas are standard definitions. The LTV:CAC and payback guidelines come from David Skok's "SaaS Metrics 2.0" on forEntrepreneurs.com, read on 1 October 2026. Every company and number in the examples below is fictional and illustrative, excl. VAT.
What customer lifetime value means in B2B
In B2B, CLV is calculated per account: every contract, renewal and extra service one customer buys, minus what it costs to deliver them. Three choices decide whether the number is useful.
Margin, not revenue. Use gross margin, so the figure can be compared with what you spend to win customers.
Account churn or revenue churn. Account churn counts customers who leave; revenue churn also counts customers who stay but buy less. Account churn is the usual starting point.
One period throughout. Annual revenue with annual churn, or monthly revenue with monthly churn. Mixing the two is the most common calculation error.
The simple formula
CLV = average annual revenue per account x gross margin % x average lifetime in years
Use it when you know how long customers stay: take the accounts that ended in the last few years in your CRM and average how long each one lasted. If few customers have left yet, cap the lifetime at a number you can defend, such as the length of your oldest relationships, rather than assuming customers stay forever.
The churn-based formula
CLV = gross margin per account per period / churn rate per period
Here average lifetime = 1 / churn rate: if 20% of accounts leave each year, the average account stays 1 / 0.20 = 5 years. This is the version in David Skok's SaaS metrics guide, which writes it as ARPA x gross margin % / churn rate, ARPA being average revenue per account. It assumes flat revenue per account, so it understates CLV when customers expand.
Annual churn = accounts lost during the year / accounts at the start of the year. Leave out accounts won during the year, or they flatter the rate.
A worked example in euros
Take a fictional managed IT services company in Ghent with 30 staff, selling yearly support contracts to Belgian and Dutch SMEs:
Input | Value |
|---|---|
Average annual revenue per account | 24,000 euros |
Gross margin on contracts | 40% |
Accounts at the start of the year | 120 |
Accounts lost during the year | 24 |
Sales and marketing spend in the year | 180,000 euros |
New accounts won in the year | 15 |
Annual margin per account: 24,000 x 40% = 9,600 euros.
Annual churn: 24 / 120 = 20%, so average lifetime is 5 years.
CLV, simple formula: 24,000 x 40% x 5 = 48,000 euros.
CLV, churn-based formula: 9,600 / 0.20 = 48,000 euros. The two agree because the lifetime here comes from the churn rate.
CAC: 180,000 / 15 = 12,000 euros per new account.
LTV:CAC: 48,000 / 12,000 = 4.
Payback: 12,000 / (9,600 / 12) = 12,000 / 800 = 15 months.
Had the company used revenue instead of margin, CLV would have been 120,000 euros and LTV:CAC a flattering 10. That gap is why margin matters.
CLV by segment
The company-wide average blends very different customers. Split the same fictional company by customer size and the picture changes:
Segment | Annual revenue per account | Gross margin | Annual churn | CLV (margin) | CAC | LTV:CAC | Payback |
|---|---|---|---|---|---|---|---|
Fewer than 10 staff | 9,000 euros | 40% | 30% | 12,000 euros | 4,000 euros | 3.0 | 13 months |
10 to 49 staff | 24,000 euros | 40% | 20% | 48,000 euros | 12,000 euros | 4.0 | 15 months |
50 to 249 staff | 60,000 euros | 35% | 10% | 210,000 euros | 45,000 euros | 4.7 | 26 months |
Illustrative figures, not benchmarks. The larger accounts have the best ratio and the slowest payback: you finance them for more than two years before they pay back. The smallest pay back fastest and leave fastest. Which segment to push depends on your cash position as much as on CLV.
Why some segments are worth more than others:
Switching cost. Where your service is built into the customer's operations or systems, leaving is expensive. A nice-to-have is the first cut in a bad year.
Room to expand. A company with several sites, departments or entities can buy more from you over time. A ten-person firm has a ceiling.
The customer's own stability. A customer that goes out of business churns whether it likes you or not. Filed accounts and filing behaviour say a lot here; see how to spot a customer in financial trouble.
Industry works the same way, and your own CRM is the only reliable source for which sectors stay longest. Group won and churned accounts by sector and size band, calculate CLV per group, and feed the winners into your ideal customer profile.
LTV:CAC and payback
CAC is total sales and marketing spend in a period divided by the new accounts won in that period. Include salaries, tools, agencies and events, not only ad spend. Two ratios then tell you whether growth pays:
LTV:CAC = CLV / CAC. How many times over an account repays what it cost to win. Skok's guideline for SaaS is above 3.
CAC payback in months = CAC / monthly gross margin per account. How long you carry the cost before it is repaid. Skok's guideline was under 12 months; he notes it was written in 2011, when capital was hard to raise, and that enterprise businesses that land small and expand can run around 20 months and work fine.
Treat those as one investor's rule of thumb for software, not a law for a services business; the trend in your own ratios matters more. Both sit alongside the other numbers in the sales KPIs worth tracking.
How to raise CLV
CLV has three levers: margin, revenue per account and lifetime. Most of the room is in the second and third.
Onboarding
Accounts that never get value from what they bought leave at the first renewal. Agree what a successful first 90 days looks like, name an owner on both sides, and check in before the first invoice, not after the first complaint.
Expansion
A customer that buys a second service is worth more and harder to lose. Time the conversation to a real change at the customer, such as a new site or a merger. Upselling and cross-selling in B2B covers how to do it without damaging the relationship.
Retention
Give your largest accounts a named owner who reviews usage, results and upcoming renewals on a schedule. That is the core of the account manager role. Track churn by reason as well as rate: price, poor fit, a champion leaving and a customer going under each need a different fix, and "poor fit" is a message for whoever builds your prospect lists.
That last point closes the loop. Once you know which segment carries the highest CLV, the fastest way to raise the average is to win more accounts that look like it. Bizzy's lookalike search takes a company you name, for example your best customer, and finds companies whose websites describe similar activity. For Belgian companies you can narrow the result on filed headcount, region and legal form from the KBO register and the National Bank of Belgium, and push it to HubSpot, Salesforce, Pipedrive or another connected CRM. How to find companies like your best customers explains the method step by step.
Lifetime value depends on how long customers stay: B2B churn and how to spot it early.
Frequently asked questions
What is a good customer lifetime value? No universal number exists. Judge it against what it costs to win an account: David Skok's SaaS guideline is an LTV:CAC ratio above 3 and CAC recovered within 12 months.
What is the difference between CLV and LTV? None. Customer lifetime value, CLV, LTV and CLTV are names for the same metric.
How do I calculate CLV without churn data? Use the simple formula with the average lifetime of accounts that have already ended. If too few have ended, cap the lifetime at a period you can defend and recalculate later.
Should CLV use revenue or margin? Margin. Revenue-based CLV overstates what an account is worth and makes LTV:CAC look far better than it is.
Photo: magnolia blossoms in the Japanese Garden in Hasselt, Paul Hermans, CC BY-SA 4.0, via Wikimedia Commons