Model how expansion and churn compound over 24 months. Net revenue retention is the engine under every SaaS business.
Expansion vs New Logo over 24 months:
Growth from expansion: $4.3M
Growth from new logos: $2.4M
| MONTH | ARR | EXPANSION | CHURN | NET NEW LOGO | NET CHANGE |
|---|---|---|---|---|---|
| 1 | $5.0M | $125K | $60K | $100K | $165K |
| 2 | $5.2M | $129K | $62K | $100K | $167K |
| 3 | $5.3M | $133K | $64K | $100K | $169K |
| 4 | $5.5M | $138K | $66K | $100K | $172K |
| 5 | $5.7M | $142K | $68K | $100K | $174K |
| 6 | $5.8M | $146K | $70K | $100K | $176K |
| 7 | $6.0M | $151K | $72K | $100K | $178K |
| 8 | $6.2M | $155K | $74K | $100K | $181K |
| 9 | $6.4M | $160K | $77K | $100K | $183K |
| 10 | $6.6M | $164K | $79K | $100K | $185K |
| 11 | $6.7M | $169K | $81K | $100K | $188K |
| 12 | $6.9M | $173K | $83K | $100K | $190K |
| 13 | $7.1M | $178K | $86K | $100K | $193K |
| 14 | $7.3M | $183K | $88K | $100K | $195K |
| 15 | $7.5M | $188K | $90K | $100K | $198K |
| 16 | $7.7M | $193K | $93K | $100K | $200K |
| 17 | $7.9M | $198K | $95K | $100K | $203K |
| 18 | $8.1M | $203K | $97K | $100K | $206K |
| 19 | $8.3M | $208K | $100K | $100K | $208K |
| 20 | $8.5M | $213K | $102K | $100K | $211K |
| 21 | $8.7M | $219K | $105K | $100K | $214K |
| 22 | $9.0M | $224K | $107K | $100K | $216K |
| 23 | $9.2M | $229K | $110K | $100K | $219K |
| 24 | $9.4M | $235K | $113K | $100K | $222K |
NRR is the single most important metric for SaaS business health. It measures how much revenue you retain and expand from your existing customer base, excluding new logo sales entirely. While acquisition metrics tell you how fast you're filling the bucket, NRR tells you how fast it's leaking — and whether your existing customers are actually growing with you.
Why does NRR matter more than gross retention? A company with 120% NRR can grow revenue year-over-year even with zero new customer acquisition — existing customers expand faster than others churn. This is the compounding engine behind the most capital-efficient SaaS businesses in the world.
Benchmarks to calibrate against: world-class SaaS companies hit 120%+ NRR (Snowflake and Twilio both peaked above 130%). A strong benchmark is 110–120%. Acceptable for early-stage companies is 100–110%. Below 100% means you're losing ground on your existing customers — a signal that becomes existential at scale.
There are two primary levers to pull: expansion (upsell, cross-sell, seat growth) and churn reduction. Expansion has higher leverage because it doesn't require new acquisition spend — you're growing revenue from customers who already trust your product. The most effective tactics include a land-and-expand sales motion, proactive QBRs, CSM-led expansion plays, product stickiness improvements, and usage-based pricing that grows naturally as customers succeed.
The compounding effect is significant: 110% NRR doubles revenue from existing customers in 7 years. 120% NRR doubles it in 4 years — purely from expansion and retention, without a single new logo. This is why investors treat NRR as a core underwriting metric and why best-in-class go-to-market teams obsess over it.
120%+ is world-class and investor-grade (common in top-quartile PLG companies). 110–120% is strong. 100–110% is acceptable for early-stage companies. Below 100% means your existing customer base is shrinking, which is an existential signal at scale.
Gross Revenue Retention (GRR) counts only churn and contraction — it can never exceed 100%. NRR adds expansion revenue, so it can exceed 100%. GRR measures how well you retain; NRR measures how well you grow what you have.
A 2% monthly churn rate is 22% annual churn compounded — meaning you lose roughly one in five customers per year. Even strong expansion (3% monthly) struggles to overcome high churn. NRR will be approximately (1 + 0.03)^12 / (1 + 0.02)^12 - 1 = ~112% in this scenario, but the math deteriorates fast as churn rises.
Below 1% monthly (under 12% annually) is the threshold most B2B SaaS companies target. Below 0.5% monthly (6% annual) is strong. Above 2% monthly is a significant warning sign. The benchmark varies by segment — enterprise SaaS can achieve 0.2–0.5% monthly; SMB SaaS typically sees 1–3%.
Discuss this in #cs-and-expansion with 194+ revenue operators in the community.