# How to Calculate Net Dollar Retention Before Your Investors Do

> Founders fudge net dollar retention calculations to hide true customer health.
- Title: How to Calculate Net Dollar Retention Before Your Investors Do
- Summary: Founders fudge net dollar retention calculations to hide true customer health. Investors demand accurate net dollar retention calculations to assess existing…
- Keywords: net dollar retention, investors, founders, saas, revenue retention, churn rate, bessemer venture partners, snowflake, twilio, startups, business, Calculate
- Source: Startup Fortune — https://startupfortune.com/how-to-calculate-net-dollar-retention-before-your-investors-do-it-for-you
- Published: 2026-10-20T22:15:39+00:00
- Read time: 2 min
- Topics: net dollar retention, investors, founders, saas, revenue retention, churn rate, bessemer venture partners, snowflake, twilio, startups, business
## 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.
## Key takeaway

Investors demand accurate net dollar retention calculations to assess existing customer growth without new logos.