Monthly churn on current ARR — see the leaky bucket over 12 months before you underestimate the problem.
The leaky bucket reality:
At 1.5% monthly churn, you lose 16.6% of ARR annually — even before considering contraction.
That's $1.3M at risk each year just to stay flat.
| MONTH | ARR | CHURNED | NEW LOGO | NET CHANGE |
|---|---|---|---|---|
| 1 | $8.0M | $120K | $150K | +$30K |
| 2 | $8.0M | $120K | $150K | +$30K |
| 3 | $8.1M | $121K | $150K | +$29K |
| 4 | $8.1M | $121K | $150K | +$29K |
| 5 | $8.1M | $122K | $150K | +$28K |
| 6 | $8.1M | $122K | $150K | +$28K |
| 7 | $8.2M | $123K | $150K | +$27K |
| 8 | $8.2M | $123K | $150K | +$27K |
| 9 | $8.2M | $123K | $150K | +$27K |
| 10 | $8.3M | $124K | $150K | +$26K |
| 11 | $8.3M | $124K | $150K | +$26K |
| 12 | $8.3M | $125K | $150K | +$25K |
Most leaders think of churn linearly: 2% monthly churn means we lose 2% of revenue per month, so 24% per year. The reality is worse in a different way than expected. Compounded monthly churn of 2% results in 21.5% annual churn (not 24%), but the impact compounds differently when you factor in that lost revenue also means lost expansion potential. Every churned customer is not just their current ARR — it's their growth potential for the next 3–5 years. The leaky bucket metaphor is apt: new logo acquisition is pouring water into a bucket that has a hole. The larger the hole, the faster you have to pour just to stay flat. The ARR waterfall visualization is more honest than a single churn rate number because it shows the month-by-month erosion as a concrete dollar figure, not an abstract percentage.
Churn rate varies dramatically by segment: SMB churn of 2–4% monthly is common and often accepted as structural; enterprise churn below 0.5% monthly is the standard for best-in-class programs. The NRR connection is direct — high churn makes 100%+ NRR nearly impossible regardless of expansion rate, because expansion revenue must first offset what's leaving. Benchmark ranges: best-in-class enterprise SaaS sits at 0.2–0.5% monthly churn. Acceptable is below 1%. Warning zone is 1.5–2%. Crisis is above 2% monthly (25%+ annually), a level at which even aggressive new logo acquisition struggles to produce net growth.
Under 0.5% monthly (about 6% annually) is world-class. Under 1% monthly (12% annually) is healthy for most B2B SaaS. 1–2% monthly is a warning zone. Above 2% monthly (25%+ annually) means you're losing a quarter of your customers every year — a level that makes sustainable growth extremely difficult.
Annual churn = 1 - (1 - monthly_churn)^12. A 2% monthly churn doesn't equal 24% annual — it equals about 21.5% annual. The compounding effect means monthly and annual rates can't be converted by simple multiplication.
Customer churn counts the number of customers who cancel. Revenue churn (or MRR churn) counts the revenue lost. If your largest customer churns, revenue churn is high but customer churn might be low. Revenue churn is more meaningful for business health — it directly impacts ARR and NRR.
Poor time-to-value in the first 90 days is the #1 driver of early churn. Customers who don't reach a meaningful success milestone in their first 90 days churn at 3–5× the rate of those who do. After the 6-month mark, the primary churn driver shifts to ROI — customers who can't quantify the value relative to cost will not renew.
Discuss this in #cs-and-expansion with 194+ revenue operators in the community.