In many businesses, a small number of customers generate a significant portion of sales. The Pareto principle summarizes this as the 80/20 rule: about 20% of customers generate about 80% of revenue. It’s not an exact law, but rather a guideline for examining your own customer base and understanding how concentrated your sales are.

Why does it matter?

Knowing who supports your business changes your priorities. Those customers deserve special attention: benefits, thoughtful communication, and close follow-up.

It’s also a warning sign. If your sales depend on just a few people, losing some of them can have a major impact on your results. That’s why it’s important to take care of your best customers while also helping others increase both the frequency and value of their purchases.

How is it calculated?

Formula: Concentration = revenue from the customer group that spends the most ÷ total revenue × 100. To calculate it, sort your customers from highest to lowest spending and select the top percentage you want to analyze—for example, the top 20%.

For example: You have 1,000 customers and $100,000 in revenue. Your 200 highest-spending customers account for $70,000. The concentration is $70,000 ÷ $100,000 × 100 = 70%: 20% of your customers generate 70% of your sales.

Story mode

An online sports store analyzes its past year and discovers that a small group of customers accounts for a large portion of its sales. Among them is Lucía, who buys running gear every two months. The store creates a program for that group and, at the same time, a strategy to encourage one-time customers to shop there again.

How to Use It with Data4Sales

• RFM and lifecycle segments to identify your most valuable customers, such as Champion Customers.
• Predictive LTV to identify which customers will be most valuable in the future.
• Churn probability to identify valuable customers at risk early on.
• Strategic analysis takes a closer look at how your revenue is distributed.

Related terms

• Customer Champions
• RFM
• LTV
• "Can't-lose" customers