What is churn rate?
Churn rate is the percentage of customers or recurring revenue a business loses over a given period. It is the single biggest growth drag and the truest test of customer value.
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Definition
Churn rate is the percentage of customers or recurring revenue a business loses over a given period. It comes in two forms: customer (logo) churn, the share of customers lost, and revenue (MRR) churn, the share of recurring revenue lost. For SaaS, churn is the single biggest drag on growth — and the truest test of whether the customers you acquire are worth acquiring.
How to calculate churn rate.
Pick customer churn or revenue churn depending on what you're measuring:
Customer Churn Rate =
Customers Lost in Period ÷ Customers at Start of Period
Gross Revenue (MRR) Churn =
MRR Lost in Period ÷ MRR at Start of Period
Net Revenue Churn =
(Churned MRR − Expansion MRR) ÷ MRR at Start of Period
Gross vs net matters. Gross churn counts only lost revenue. Net revenue churn subtracts expansion from existing customers — and if expansion outpaces losses, net churn goes negative, which is a strong signal of healthy, expanding revenue. Always state the period (monthly or annual) and whether it's gross or net.
Churn rate example.
A business starts the month with 500 customers and $50,000 MRR:
Revenue churn (4.0%) is higher than customer churn (3.0%) here — a sign the customers who left were paying above average.
Why churn matters for attribution.
Churn changes what a marketing channel is actually worth. Two channels can have identical CAC, but if one acquires customers who churn in month two and the other acquires customers who stay and expand, their real economics are worlds apart. Attribution that stops at the first sale — or counts trial signups — completely misses this.
That's why retention belongs inside attribution. Signal Sparrow ties cohort retention to the channel that acquired each customer, so you can see which sources bring durable, expanding revenue — not just cheap signups that churn. Combined with revenue attribution reconciled to Stripe, churn stops being a lagging surprise and becomes a channel-selection input.
Questions, answered.
Everything teams ask before switching their attribution to Stripe truth. Still curious? Talk to us.
Churn rate is the percentage of customers or recurring revenue lost over a period. Customer churn measures lost customers; revenue churn measures lost MRR.
Divide what you lost by what you started with. Customer churn = customers lost ÷ starting customers; gross MRR churn = MRR lost ÷ starting MRR. Always specify the period.
Customer churn counts lost accounts; revenue churn counts lost MRR. They differ when the customers who leave pay more or less than average — a high-value churned customer raises revenue churn above customer churn.
It varies by segment, but many healthy B2B SaaS businesses target low single-digit monthly churn, and best-in-class achieve negative net revenue churn, where expansion outpaces losses.
Negative (net) churn happens when expansion revenue from existing customers exceeds the revenue lost to downgrades and cancellations — so your existing customer base grows revenue even before new sales.
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