Account-level Churn
IntermediateAccount-level churn is the share of customer accounts that stop using or paying for a product within a period, counted per organisation rather than per person.
The denominator is the accounts active at the start of the period and the numerator is the accounts lost by the end of it; one user leaving an organisation is not churn unless the whole organisation leaves. Three churn rates must not be confused: user churn, account churn and revenue churn move independently, and losing one large customer can leave account churn almost unchanged while wrecking revenue. The definition of lost also has to be fixed in advance, because a cancelled subscription and an absence of activity for a set number of days are two different events months apart.
How it is calculated
Account-level churn = accounts lost during the period ÷ accounts active at the start of the period
Accounts added mid-period belong in neither the numerator nor the denominator, otherwise fast growth artificially lowers the rate. The unit is a percentage and the period length is part of the definition; a monthly rate cannot be turned into an annual one by multiplying by twelve.