How do you calculate churn rate?

Customers or revenue lost during a period, divided by the count or revenue at the start. The denominator choice — starting base versus average base versus renewal-eligible base — changes the answer materially and is rarely stated.

What is the difference between logo churn and revenue churn?

Logo churn counts customers; revenue churn weights them by value. They diverge when the customers leaving are systematically larger or smaller than average, and that divergence is itself the finding.

Should downgrades count as churn?

They are contraction, not churn — the customer is still there. Folding them together makes it impossible to tell a shrinking relationship from a lost one, which call for different responses.

Why is annual churn not just monthly churn times twelve?

Because churn compounds against a shrinking base. Twelve months at 2% leaves about 78.5% remaining, so annual churn is roughly 21.5%, not 24%.

Churn Rate

The proportion of customers or revenue lost over a period, expressed as a percentage of the starting base.

The calculation and its ambiguity

Customers or revenue lost in a period over the base at the start. The arithmetic is trivial; the comparability is not, because four choices are made silently and each moves the number.

What makes two churn figures incomparable

Choice	Options	Why it matters
Unit	Logos or revenue	Diverge when departing customers are not average-sized
Denominator	Starting, average, or renewal-eligible base	Renewal-eligible is far smaller, so the rate looks higher
Downgrades	Churn or contraction	Folding them in conflates shrinking with leaving
Period	Monthly or annual	Compounding means one is not a multiple of the other

Source: Distinctions stated here

The denominator choice is the biggest lever

Annual contracts mean only a fraction of the base can churn in any given month. Dividing by the whole base rather than the renewal-eligible base produces a reassuring number that describes contract timing more than customer behaviour.

Computing it defensibly

State the unit, denominator, treatment of downgrades and period alongside every figure. Without those four, the number cannot be compared to anything, including your own prior quarters.
Use cohorts. Follow each starting cohort forward rather than computing a period rate over a mixed base, which conflates tenure effects with genuine change.
Separate voluntary from involuntary churn. Failed payments are a billing problem with a different, usually cheaper, fix than a product or value problem.
Report logo and revenue churn together. One high and the other low locates the problem in a specific customer size band.

Where it misleads

A falling rate during rapid growth can be a base effect: a larger denominator of young customers who have not reached their renewal yet.
Averaging across contract lengths mixes populations with structurally different opportunities to leave.
Churn is recorded when a contract ends, which can be months after the customer stopped using the product — so it is a lagging measure of a decision already made.

RELATED TERMS

Gross Revenue Retention (GRR)

Revenue retained from an existing cohort excluding expansion. Caps at 100% and measures only what was lost.

Logo Retention

The proportion of customers retained by count rather than by value.

Renewal Rate

The proportion of contracts up for renewal in a period that actually renewed.

Churn

Customers or revenue lost over a period. The leak determining whether acquisition compounds or merely replaces.

COMMON QUESTIONS

How do you calculate churn rate?: Customers or revenue lost during a period, divided by the count or revenue at the start. The denominator choice — starting base versus average base versus renewal-eligible base — changes the answer materially and is rarely stated.
What is the difference between logo churn and revenue churn?: Logo churn counts customers; revenue churn weights them by value. They diverge when the customers leaving are systematically larger or smaller than average, and that divergence is itself the finding.
Should downgrades count as churn?: They are contraction, not churn — the customer is still there. Folding them together makes it impossible to tell a shrinking relationship from a lost one, which call for different responses.
Why is annual churn not just monthly churn times twelve?: Because churn compounds against a shrinking base. Twelve months at 2% leaves about 78.5% remaining, so annual churn is roughly 21.5%, not 24%.

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