Customer Churn Rate

What it measures

The percentage of unique customers (logos) that cancel or stop paying in a defined period (typically a month) as a share of the logos active at the start of that period. One-time customers, trial sign-ups that never converted to paid, and downgrades (plan reductions) are excluded—only full account terminations count as churn.

Why it matters

Churn rate tells you how fast your customer base is leaking. If you churn 5% monthly, you lose roughly half your base every year; if you churn 2% monthly, you keep 78% annually. Sales and product teams obsess over this because it's the inverse of retention: you can acquire customers all day, but if half of them leave, you're running a leaky bucket. Leadership reads churn to answer 'Can we grow faster than we bleed?' Finance uses it to forecast revenue waterfalls; product uses it to prioritize retention features. A rising churn rate is often the first signal that product-market fit is slipping.

How to read it

Low churn (under 2% monthly) means your product is sticky, your customer success team is effective, or you've found a durable niche. High churn (over 5% monthly) doesn't necessarily mean the product is bad—it might mean you're selling to the wrong segment, pricing is too high, or onboarding is broken. Compare churn month-over-month: is it climbing, steady, or falling? Churn that rises month-over-month is a red flag (sign of accelerating decay); churn that falls is green. Also always segment churn by cohort, region, and deal size—a $1K/month customer churning is different from a $50K/month customer churning.

What good looks like

Watch-outs

• Counting downgrades as churn. A customer who moves from a $5K/month plan to a $2K/month plan is a downgrade or contraction—not a churn. Only full-account terminations (customer revenue goes to $0) count as churn.
• Including trial or freemium churn. Free-trial users who never pay are not logos and do not contribute to churn rate—churn only applies to paying customers. Similarly, free-tier users who downgrade to zero don't count as churn.
• Averaging churn across wildly different cohorts. A 3% churn rate across SMB (small 1K/month deals) vs. Enterprise (large 100K+ deals) hides the real picture. Segment by ACV, region, or product tier and track cohort churn separately.
• Forgetting to annualize. A 3% monthly churn doesn't mean 36% annually (3% × 12). It means you retain 97% each month, so annualized retention is 0.97^12 ≈ 71%—meaning 29% annual churn. Use this for strategic planning; monthly churn is operational.

Worked example