GRR vs NRR: the two retention metrics that matter
GRR (Gross Revenue Retention) measures what % of MRR you keep from existing customers ignoring expansion — it caps at 100%. NRR (Net Revenue Retention) adds upgrades and seat expansion back in, so it can exceed 100%. Investors anchor on NRR because >100% means your existing base grows even with zero new signups — a moat that compounds.
- • GRR > 90% monthly (annual ~70%): healthy for SMB SaaS.
- • NRR > 100% monthly (annual >120%): top-decile expansion motion.
- • NRR < 90% annual: leaky bucket — fix retention before scaling acquisition.
Why 1% of churn matters more than you think
Cutting monthly churn from 4% to 3% extends average lifetime from 25 months to 33 months — a 32% increase in LTV without changing pricing or acquisition. At $50K MRR with no new signups, that's roughly $6,000 in additional 12-month revenue. Retention compounds; acquisition is a one-time injection.
How to use this calculator
Pull your real numbers from billing (Stripe/Chargebee). Monthly logo churn = customers cancelled ÷ customers at start of month. Monthly revenue churn = MRR lost to cancels + downgrades ÷ MRR at start. Expansion = MRR added from upgrades ÷ MRR at start. Run the model with current numbers, then with –1 point churn — that delta is your retention team's annual ROI target.
Churn is the most misunderstood SaaS metric — gross vs. net, monthly vs. annual, customer vs. revenue churn all give different numbers, and confusing them leads to dramatic over- or under-stating of business health. This calculator runs all five variants in parallel and shows how each affects the revenue impact and LTV math.
What each input means
Get these inputs right and the output is reliable. Get them wrong and the calculator just multiplies bad assumptions.
Period start customers
Active customers at the beginning of the period.
Typical range: Use last month's end-of-period for monthly churn.
Customers churned (gross)
Customers who cancelled (regardless of new signups).
Typical range: Pull from Stripe/billing system, not CS records.
Customers churned (net of expansions)
Adjusted for upgrades/downgrades.
Typical range: Same as gross unless you have tier upgrades.
MRR start of period
Total recurring revenue at start.
Typical range: Sum of all active subscriptions.
MRR lost (churned)
Recurring revenue from cancelled customers.
Typical range: MRR weighted, not customer count.
MRR expansion
Upgrades + cross-sells in the period.
Typical range: Healthy SaaS: 8–15% of starting MRR.
Worked examples
Real scenarios with the math walked through line by line.
Mid-stage SaaS, healthy retention
Scenario: 1,000 customers, 25 churned. MRR start $80k, MRR churned $1,500, MRR expansion $6,000.
Math: Customer churn = 25/1,000 = 2.5%. Gross revenue churn = $1,500/$80k = 1.9%. Net revenue churn = ($1,500 − $6,000)/$80k = −5.6% (net revenue retention of 105.6%).
Outcome: NRR >100% is the gold standard. This business grows on its existing book even with zero new signups.
Self-serve SMB SaaS with high gross churn
Scenario: 5,000 customers, 350 churned. MRR start $250k, MRR churned $14k, MRR expansion $5k.
Math: Customer churn = 7%. Gross revenue churn = 5.6%. Net = (14k − 5k)/250k = 3.6%.
Outcome: Customer LTV ≈ ARPU ÷ revenue churn = $50 ÷ 0.056 = $893. CAC needs to stay <$300 to maintain healthy LTV/CAC.
Common mistakes
Where this calculation usually goes wrong in the real world.
- Reporting customer churn instead of revenue churn. Revenue churn weights by ARPU — higher-paying customers count more.
- Annualizing monthly churn linearly. 5% monthly is 46% annual, not 60%.
- Mixing voluntary and involuntary (failed payment) churn. Fix involuntary with smart dunning before optimizing voluntary.
- Excluding 'paused' accounts. They almost all cancel within 60 days.
- Not segmenting by cohort. A 5% blended churn rate may hide 15% on new customers and 1% on customers >12 months old.
When to use this calculator
- Monthly board reporting.
- Forecasting MRR and LTV.
- Deciding whether to invest in retention vs. acquisition.
- Diagnosing whether a recent product change hurt or helped retention.
Glossary
Gross revenue churn
MRR lost from cancellations ÷ starting MRR. Always positive.
Net revenue churn
(MRR lost − MRR expansion) ÷ starting MRR. Can be negative (NRR >100%).
NRR
Net revenue retention = (start MRR + expansion − churned) ÷ start MRR. Best-in-class SaaS targets 120%+.
Cohort churn
Churn rate calculated separately for each signup cohort. Reveals whether retention is improving over time.
More questions answered
What's a healthy churn rate for SaaS?
Benchmarks vary by segment: enterprise SaaS targets <1% monthly customer churn (12% annual); mid-market 1–2%; SMB self-serve 3–7%; PLG/freemium 5–10%. Revenue churn typically runs 1–2 points lower than customer churn because larger customers churn less. Anything above 8% monthly customer churn is usually a product-market-fit problem, not a marketing fix.
Why do you focus on net revenue retention instead of just churn?
Net revenue retention captures both churn and expansion — the two levers that determine whether a SaaS business can grow without constant new acquisition. A business with 5% gross churn and 8% expansion has 103% NRR and compounds even with zero new signups. A business with 2% gross churn and zero expansion has 98% NRR and slowly shrinks. NRR is the single most predictive metric for long-term SaaS valuation.
How do I reduce churn quickly?
Fastest-win sequence: (1) fix involuntary churn with smart dunning (Stripe Smart Retries, Recurly, Churnkey) — typically recovers 30–50% of failed-payment churn within weeks; (2) add cancellation save flow with pause option — saves 20–35% of voluntary cancellations; (3) increase onboarding completion rate — first-30-day churn is usually 2–3× higher than ongoing churn, so completion improvements compound for years.
Methodology last reviewed: 2026-05 by the RevenueLab editorial team.
FAQ
What's a good monthly churn rate?
B2C consumer apps: 5–7% monthly is normal. SMB SaaS: 3–5% is average, under 2% is excellent. Mid-market: 1–2%. Enterprise SaaS: under 1% monthly (under 10% annual). Anything above 7% monthly is a leaky bucket — fix retention before pouring money into acquisition.
What's the difference between logo churn and revenue churn?
Logo churn counts customers (5 of 100 leave = 5% logo churn). Revenue churn counts MRR lost (if those 5 customers were your biggest, revenue churn might be 12%). Revenue churn is the more important number — it weights losses by impact. Track both: a gap between them tells you whether you lose your biggest or smallest accounts.
What is NRR (Net Revenue Retention)?
NRR = (starting MRR − churn + expansion) ÷ starting MRR. It measures whether existing customers grow or shrink in revenue over a period. NRR > 100% means existing customers pay you more this month than last month, even ignoring new signups. Best-in-class SaaS posts 110–130% annual NRR — Snowflake famously hit 168%.
How do I calculate customer LTV from churn?
Simple form: LTV = ARPU ÷ monthly churn rate. At $99 ARPU and 4% monthly churn, average customer lifetime is 1/0.04 = 25 months, so LTV ≈ $2,475. More accurate version applies gross margin: LTV = (ARPU × gross margin) ÷ monthly churn. For LTV:CAC, divide that by your blended CAC — aim for 3x or higher.
Why does cutting churn 1 point matter so much?
Churn compounds. Cutting monthly churn from 5% to 4% changes annual retention from ~54% to ~61% and extends customer lifetime by 25%. The compounding effect over multi-year horizons is dramatic — a single point of monthly churn improvement can be worth 6–12 months of acquisition spend in retained revenue.