From Startup Fortune · · 2m
How to Calculate Net Dollar Retention Before Your Investors Do
Founders fudge net dollar retention calculations to hide true customer health.
In brief
Founders fudge net dollar retention calculations to hide true customer health. Investors demand accurate net dollar retention calculations to assess existing customer growth without new logos. Originally reported by Startup Fortune.
Net Dollar Retention Formula
Net dollar retention equals starting ARR from a cohort, plus expansion, minus contraction and churn, divided by that same starting ARR.
What Net Dollar Retention Means
A 100% NDR means a cohort's revenue held flat even if some individual customers left or shrank.
Why Investors Care
Investors recompute NDR from your cohort data because gross retention and logo retention both hide the number that actually drives valuation.
Bessemer's Benchmark Ranges
Bessemer's annual State of the Cloud reports show acceptable NDR ranges: 100-110% for maturing SaaS, 110-120% good, above 120% premium multiples.
Common Fudging Moves
The most common fudge is calculating NDR off total ARR instead of a fixed starting cohort, which quietly folds new sales into the metric.
How to Calculate NDR
Take the ARR from a defined cohort at the start of a period, add expansion, subtract contraction and churn, divide by original starting ARR.
Example Calculation
Starting with $10 million ARR, losing $1.5 million to churn and downgrades, expanding by $2 million gives a 105% net dollar retention.
Gross Retention Limitations
Gross retention only measures what you kept, capped at 100%, and never credits expansion.
Logo Retention Flaws
Logo retention counts accounts, not dollars, so losing one $200,000 enterprise customer and gaining three $5,000 ones looks identical to losing nothing.
Why NDR Matters
Net dollar retention is the only metric that can go above 100%, showing if your product gets more valuable to existing customers.
Snowflake's Extreme Case
Snowflake reported net revenue retention above 170% in early public years, showing existing customer base expanding faster than most companies' entire growth engines.
NDR vs Churn Rate
Churn rate tells how many customers or revenue left; NDR tells what happened to revenue that stayed, net of everyone who left and grew.
How to Negotiate Accurately
Prep your cohort-level billing data before investor calls, define the twelve-month cohort, and run calculations skeptically against the full list.
The essence
Investors demand accurate net dollar retention calculations to assess existing customer growth without new logos.
