Revenue Concentration Ratio Calculator
Estimate how much reported revenue depends on the largest customer and the five largest customers.
How to use this calculator
- Enter revenue from largest customer, combined revenue from top five customers, total revenue in the period; check the units and use values from the same period or scenario.
- Review the result and intermediate values; change one input at a time when comparing scenarios.
- Keep the stated formula and assumptions with any result you share.
Formula and method
Largest-customer share = largest-customer revenue ÷ total revenue × 100. Top-five share = top-five revenue ÷ total revenue × 100.
- The largest customer contributes 16.8%; the top five contribute 45.2%.
- Concentration is one risk indicator, not a full credit or customer-retention assessment. Keep the same period and revenue definition.
Worked examples
Worked example
The largest customer contributes €42,000 and the top five contribute €113,000 of €250,000 revenue.
The largest customer contributes 16.8%; the top five contribute 45.2%.
The largest customer contributes 16.8%; the top five contribute 45.2%.
Understanding the result
The largest customer contributes 16.8%; the top five contribute 45.2%.
Concentration is one risk indicator, not a full credit or customer-retention assessment. Keep the same period and revenue definition.
Important notes
Concentration is one risk indicator, not a full credit or customer-retention assessment. Keep the same period and revenue definition.
Use measured inputs and verify that the model matches the situation before making an operational, financial or technical decision.
Frequently asked questions
Is there a universal safe concentration level?
No. Customer contracts, renewal patterns, margin, industry and replacement cost all matter.
Should the top five include the largest customer?
Yes, by definition in this calculator.
What should I check before relying on this result?
Verify units, input definitions and assumptions against your real data or the relevant product, service or professional guidance.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.