Customer Concentration Calculator

Use this calculator to estimate customer concentration.

What this calculator does

The customer concentration calculator helps measure how much of your revenue depends on your biggest customer.

It is useful for:

• risk analysis
• revenue diversification review
• investor reporting
• account dependency assessment

Formula

Customer Concentration = Top Customer Revenue ÷ Total Revenue × 100

Where:

• Top Customer Revenue = revenue from the largest customer
• Total Revenue = total business revenue in the period
• Customer Concentration = percentage of revenue tied to the top customer

Example calculation

If:

• Top customer revenue = 250000
• Total revenue = 1200000

Then:

• Customer concentration = 250000 ÷ 1200000 × 100
• Customer concentration = 20.83%

What is customer concentration?

Customer concentration measures how reliant a business is on one major customer for revenue.

Why customer concentration matters

This calculation helps businesses:

• understand concentration risk
• improve revenue resilience
• support lending or funding reviews
• guide customer diversification strategy

When to use this calculator

Use this calculator when you want to:

• assess dependency on major accounts
• prepare management reports
• review revenue quality
• reduce customer risk exposure

Common mistakes

Common mistakes include:

• comparing different time periods
• using projected instead of actual revenue
• excluding other important revenue streams
• reviewing only one customer when several large customers matter

Customer concentration vs revenue concentration

These are closely related.

• Customer concentration focuses on reliance on specific customers
• Revenue concentration can describe broader concentration across products, channels, or customer groups

Related calculations

You may also want to use:

• Net Revenue Retention Calculator
• Revenue Calculator
• Cash Flow Calculator

FAQs

What does this calculator do?

It helps you calculate customer concentration.

Why is this important?

It shows how much of your revenue depends on your biggest customer.

Is lower customer concentration better?

Generally yes, because lower dependency usually means less revenue risk.