The rate at which customers or their revenue leave. Worth asking which is being quoted: losing many small accounts and losing one large one produce very different pictures from the same headline figure.
Why it matters
Churn sounds like a single, simple fact, but the word covers at least two genuinely different
measurements, and a company can quote whichever one flatters it most. Losing many small
customers and losing one large one can produce an identical churn rate on a customer-count basis
while meaning very different things for the revenue that actually walks out the door.
For a buyer, churn is one of the clearest early signals of whether a product is holding onto the
value it creates. A business that has to keep replacing a large share of its customer base every
year is spending real effort just to stay flat, and that effort competes directly with the effort
spent on growth.
How it works
Customer churn counts the share of customers who leave in a period, regardless of what each
one was worth. It treats a customer paying a small amount the same as one paying a large amount,
which makes it a poor measure of financial impact but a reasonable measure of how many
relationships the product is failing to keep.
Revenue churn (sometimes called dollar churn) counts the share of revenue lost, weighting
each departure by what that customer was actually paying. Losing a handful of your largest
accounts can produce a small customer-churn number and a large revenue-churn number at the same
time, and that gap is exactly the thing worth asking about.
Gross versus net matters too. Gross churn counts only what left. Net churn nets losses
against expansion from remaining customers, which is the same idea net revenue retention captures
from the opposite direction — the two are close cousins, calculated from the same underlying
customer movements.
The period and the cohort matter. A monthly churn rate compounds very differently from an
annual one, and churn measured across the whole customer base can hide a much higher rate among
newer or smaller accounts than among long-standing ones.
On GetDeal
A GetDeal listing does not carry a churn figure of its own; a buyer should ask for
it, with the customer and revenue numbers it is drawn from, and check both in the data room. The AI
analysis report sees a churn figure only where public sources or the deck state one: when it builds
its valuation range and per-section confidence, it works from public sources and, where supplied,
the company's own statements, which it treats as claims rather than verified facts — and it never recomputes churn from
raw customer records.
Calculate your valuation range
Questions people ask
- What is the difference between customer churn and revenue churn?
- Customer churn counts how many customers left, treating every customer the same regardless of size. Revenue churn counts how much revenue was lost, weighting each departure by what that customer was actually paying. A company can lose few customers by count but a large share of revenue if the ones who left were its biggest accounts, so the two figures can tell very different stories from the same set of cancellations.
- Why does the churn period matter when comparing two companies?
- A monthly churn rate and an annual churn rate are not directly comparable, because a small monthly rate compounds over twelve months into a much larger annual figure. Two companies can each quote a churn number that sounds similarly low while measuring over very different windows, so it is worth confirming the period before treating either figure as comparable.
- Can a low overall churn rate hide a problem?
- Yes. A blended churn rate across an entire customer base can look healthy while newer or smaller customers are leaving at a much higher rate than long-standing larger ones. Breaking the figure down by customer age, size or cohort often reveals a problem that a single blended number conceals, particularly in a company still growing its base of newer accounts.
See also
More in Metrics
- ARR — The annualised value of subscription revenue that repeats — contracted and expected to continue.
- Burn rate — How much cash the company consumes each month.
- CAC — What it costs, on average, to win one customer — sales and marketing spend divided by customers gained.
- EBITDA — A measure of operating profit that strips out financing, tax and accounting charges for past spending, so two businesses can be compared on how well the operations themselves earn..
- Gross margin — What is left of revenue after the direct cost of delivering the product.
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Updated 2026-09-09