Net Churn Rate

Net churn rate is the net percentage change in MRR from an existing customer cohort, calculated by subtracting expansion revenue (upgrades, seat additions, cross-sells) from gross churn. When expansion exceeds churn losses, net churn becomes negative — meaning your existing customers grow your revenue even without acquiring a single new account.

formula.sh

Net Churn Rate = (MRR Churned − MRR Expanded) / Beginning MRR × 100

> MRR Churned — revenue lost from cancellations and downgrades
> MRR Expanded — revenue gained from upgrades, seat expansion, and cross-sells within the same existing customer cohort
> Beginning MRR — MRR at the start of the period (does not include new customer MRR)
> A negative result indicates negative churn — existing customer base is net growing

example

example.sh

Starting MRR $500,000 from existing customers. Lost $15,000 to churn/downgrades. Gained $25,000 from expansions.

($15,000 − $25,000) / $500,000 × 100

→ -2% net churn — your existing base grows MRR by 2% per month before any new sales.

why it matters

Negative net churn is the holy grail of SaaS economics. It means your existing customers, as a cohort, pay you more over time — not less. Companies with negative net churn can grow MRR indefinitely even if new customer acquisition completely stalls.

This is why investors pay a dramatic premium for companies with strong negative net churn. The implied LTV is theoretically infinite: customers not only stay, they expand. Combined with reasonable CAC, this produces economics that compound rather than decay.

The companies that achieve negative net churn tend to have usage-based or seat-based pricing with a natural land-and-expand motion. Every customer who succeeds naturally consumes more. If your pricing model does not allow for expansion within an account, negative net churn is structurally impossible — which is a valid reason to revisit your pricing.

common mistakes

✗Including new customer MRR in the expansion figure — expansion must come only from accounts that existed at period start.

✗Assuming negative net churn means you can cut acquisition investment; new customers are still needed to replace logos lost to gross churn.

✗Celebrating negative net churn at the aggregate level without checking whether it holds for all customer segments or is driven by a few whale expansions.

pro tips

✓Model the steady-state MRR implied by your net churn rate: if net churn is -2%/month compounding, your existing base doubles in ~36 months.

✓Track net churn by acquisition cohort to see if newer customers expand as readily as older ones — a flattening curve signals product or market maturation.

✓Use negative net churn as a fundraising anchor: show investors the LTV implied by the expansion curve, not just a static LTV/CAC calculation.

the mrrsucks take

Negative net churn is the difference between a SaaS business and a SaaS religion. Your customers don't just stay — they pay you more for the privilege. Everything else is just software with a subscription wrapper.

faq

What does negative net churn mean?+

Negative net churn means your existing customer base generates more new MRR through expansion (upgrades, additional seats, add-ons) than it loses through cancellations and downgrades. Your revenue from existing customers grows without any new sales.

How do I achieve negative net churn?+

Design pricing that scales with customer success — seat-based, usage-based, or outcome-based models. Build expansion triggers into the product (usage thresholds, team features, advanced tiers). Invest in customer success that proactively identifies and executes expansion opportunities.

The churn spiral›$1K MRR milestone›

related metrics

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