Churn Rate
What is Churn Rate?
Churn rate is the share of customers — or of recurring revenue — that you lose over a period. Customer churn = customers lost during the period ÷ customers at the start of the period; revenue churn applies the same idea to recurring dollars. It is the mirror image of retention, and it drives how long an average customer stays: expected lifespan is roughly 1 ÷ churn rate, so a lower churn rate lengthens the relationship and lifts lifetime value. For any business built on repeat or recurring work, churn quietly sets the ceiling on growth — new customers first have to replace the ones leaving.
Churn is the leak in the bucket. You can pour new customers in the top, but if they drain out the bottom at the same pace, the business runs hard and grows nowhere. That is why churn is read before the cost of winning each new customer: until the leak is sized, you cannot tell whether new sales are building the book or just refilling it.
Its effect compounds through lifetime value. Because the time a customer stays is roughly the inverse of churn, tightening up the customers you keep stretches the average relationship and raises what each customer is ultimately worth — often a cheaper path to growth than buying more leads. Revenue churn deserves its own look, since losing a few large accounts can hurt more than losing many small ones.
Watch it on recurring agreements especially, where a lapsed card or a missed renewal shows up as churn even when the customer never meant to leave. Track churn alongside the recurring revenue base it erodes and lifetime value to see the whole retention picture.