How to calculate customer concentration
Customer concentration is a risk metric that investors and boards scrutinize closely. A business where one or a few customers drive most revenue is fragile, because losing any of them is catastrophic.
It is usually expressed as the revenue share of the top customer or the top 5 or 10. Diversified revenue is more resilient and typically valued higher than concentrated revenue.
- Top customers / total revenue The formula
- Top 1, 5, or 10 Common cuts
- Lower is safer Diversification reduces risk
Short answer
Customer concentration measures how dependent you are on a few large customers. Divide the revenue from your top customers (often the top 1, 5, or 10) by total revenue. If your largest customer is 25 percent of revenue, concentration risk is high. High concentration means losing one account could severely damage the business.
Step by step
Rank customers by revenue
Order all customers by their recurring revenue contribution over the period.
Sum the top customers
Add the revenue of your top customer, top 5, and top 10, depending on the concentration cut you want to report.
Divide by total revenue
Concentration equals the top customers' revenue divided by total revenue, times 100. Compute it for each cut.
Assess the risk
Judge whether any single customer or small group represents a dangerous share. A top customer above 10 to 20 percent of revenue is a concentration risk worth managing.
Worked example
Your total ARR is 10,000,000 dollars. Your largest customer contributes 2,000,000 dollars, and your top 5 contribute 5,000,000 dollars.
Top-customer concentration = 2,000,000 / 10,000,000 = 20 percent, and top-5 concentration is 50 percent. Losing the top customer would erase a fifth of revenue overnight, a serious risk that argues for diversifying the base and locking in that account with multi-year terms.
How Ardovo handles it
Ardovo reports customer concentration by top-N cuts and flags accounts whose share of revenue makes them a risk. Rook highlights concentration creeping up as a few accounts grow, so you diversify or protect those relationships before they become a single point of failure.
Frequently asked questions
What is the customer concentration formula?
Revenue from your top customers (often the top 1, 5, or 10) divided by total revenue, times 100. It measures how dependent the business is on a small number of large accounts.
What is a high customer concentration?
A single customer above 10 to 20 percent of revenue is generally considered a concentration risk. The exact threshold varies, but the more revenue rides on one or a few accounts, the more fragile the business.
Why does customer concentration matter?
Because losing a highly concentrated customer can severely damage the business overnight. Investors discount concentrated revenue as riskier, so diversifying the base and locking large accounts into multi-year terms raises resilience and valuation.