The Cancellation Ceiling (Maximum Customer Cap)
New customers divided by cancellation rate is the hard ceiling on how big you can ever get.
- Difficulty
- Easy
- Time to result
- ~days to results
- Steps
- 3
- Confidence
- 95%
A one-line calculation that turns an abstract churn percentage into a concrete, scary maximum company size. Because cancellations are a percentage of your whole base (exponential) while marketing adds a fixed number (linear), churn automatically overtakes marketing as you grow. Use it to make the case that churn — not acquisition — is the binding constraint on growth.
Origin
Cohen offers this as a more useful alternative to arguing about whether 4% or 5% monthly churn is 'good'. He shows that cancellations automatically grow with company size while marketing does not, producing a mathematical ceiling where churn equals growth.
Core principles
- 01Cancellations are quoted as a percentage (exponential in your size); marketing is quoted as an absolute number (linear)
- 02Triple your customers and cancellations triple, but marketing delivers the same number of new leads
- 03There is a maximum size you can ever reach: it's where churn equals growth
- 04Works identically for logo churn (customers) and revenue churn (dollars)
How to run it
- 1
Measure monthly new customers and cancellation rate
Take how many new customers you add per month and your monthly cancellation percentage.
Pro tip Use logo (customer count) first because the resulting number is more visceral than a dollar figure.
- 2
Divide new customers by the cancellation rate
New customers per month divided by the monthly cancellation rate gives the ceiling. Example: 100 new customers/month divided by 5% = 2,000 maximum customers, ever.
Watch out As you approach the ceiling, growth crawls because you bring in customers and nearly the same number leave.
- 3
React to the number emotionally, then act
Let the ceiling sink in ('we will never have more than 2,000 customers'), then treat lowering churn as the priority rather than only pushing marketing.
Pro tip You already know you want more marketing; the point of this number is to force attention onto the churn hole.
In the wild
A company adding 100 customers a month with 5% monthly cancellation: 100 / 0.05 = 2,000. That company will never exceed 2,000 customers unless it changes marketing or churn.
→ A concrete, alarming cap that reframes churn from a tolerable percentage into an existential limit.
Cohen notes that of the 100+ public SaaS companies, only about two have NRR below 100% — and those have poor financials — because otherwise cancellation would mechanically win. Median NRR at IPO is 119%.
→ Confirms the ceiling is real: you cannot build a large SaaS company unless expansion revenue beats churn.
Common mistakes
Debating whether 5% churn is 'fine'
Comparing churn percentages abstractly ('is four much worse than five?') is noise; computing the ceiling makes the stakes real.
Believing marketing can outrun churn
Marketing doesn't care how many customers you have, so it can't scale with a churn problem that automatically grows as you grow.
Is it for you?
Best for
SaaS founders and operators who need to prioritize retention work and justify it to a team fixated on acquisition
Not ideal for
One-time-purchase or non-subscription businesses where there is no recurring cancellation rate to compound
From the transcript
“it's simply the amount of new customers you add divided by that cancellation rate. That is the amount that that is the limit.”
“So 100 divided by 5% is 2,000. So a company like that will never have more than 2,000 customers.”
“cancellations grow faster than marketing and so cancellations overpower the growth of the company and slow it to a halt”
From the episode
5 questions to ask when your product stops growing
Jason Cohen (2x unicorn founder)