Top customer share
15.6%
Customer Concentration Risk Calculator
See how much revenue depends on a few customers and what one lost account would really put at risk.
Result
Top three share
31.1%
Top five share
43.3%
Gross profit at risk
$10,640
Top-three slowdown risk
$11,200
Planning guide
Compare your top customer share to the planning range we use for general small business.
Benchmark range: 0% to 20%Your result: 15.6%
This planning guide flags when one customer carries too much of total revenue.
Source: Daykeeper planning guide (Used in this calculator)
What this means
Concentration risk needs attention
Your customer mix is showing a moderate dependence signal for general small business.
Your largest customer is carrying about 15.6% of revenue, while your top three carry about 31.1% and your top five carry about 43.3%.
If the top account left, you would need to replace about $28,000 in revenue and about $10,640 in gross profit. Even a 20% slowdown across the top three would still put about $11,200 in revenue and about $4,256 in gross profit at risk.
Planning guide
Planning ranges used in this concentration calculator
This calculator uses a planning guide because concentration risk depends on how much one customer can move the business.
The real question is simple: if your biggest customer walked away, how painful would the replacement gap be?
General small business
Use this if none of the listed industries fit, or if you want a broad planning check first.
Benchmark range: 0% to 20%
This planning guide flags when one customer carries too much of total revenue.
Source: Daykeeper planning guide (Used in this calculator)
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Calculator guide
How to use this concentration calculator
This calculator shows how dependent the business is on a few customers and what both a lost top account and a softer top-three cluster would put at risk.
Why concentration risk matters
A profitable business can still be fragile if too much revenue sits in one or two accounts.
That fragility often stays hidden until a renewal slips, a buyer changes, or a contract ends.
What to do with the result
If concentration is high, the next move is usually diversification, not panic.
The goal is to lower dependence before a single customer event becomes a business event.