B2B SaaS Net Dollar Retention (NDR), Logo Churn & Expansion ARR Calculator
Model Net Dollar Retention (NDR), Gross Revenue Retention (GRR), Logo Churn, SaaS Quick Ratio, and 3-Year Compounding ARR Trajectories with cohort upgrade, downgrade, and churn modeling.
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How to Use the SaaS NDR & Churn Calculator
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STEP 01Enter your cohort baseline metrics: Starting ARR (e.g. $1,200,000) and beginning customer count (e.g. 100 enterprise accounts).
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STEP 02Input expansion ARR generated from seat upgrades, usage tiers, and cross-sells alongside contraction ARR from downgrades.
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STEP 03Specify lost churned ARR and canceled customer logo count over the 12-month measurement window.
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STEP 04Evaluate your SaaS Quick Ratio, Net Dollar Retention (NDR %), Gross Revenue Retention (GRR %), and 3-year compounding cohort trajectory.
Frequently Asked Questions (SaaS NDR & Churn Calculator)
What is the exact formula for Net Dollar Retention (NDR)?
Net Dollar Retention (NDR) measures the percentage of recurring revenue retained from an existing customer cohort over a 12-month period. Formula: NDR = [(Starting ARR + Expansion ARR - Contraction ARR - Churned ARR) / Starting ARR] × 100. An NDR above 100% indicates net negative revenue churn.
How does Gross Revenue Retention (GRR) differ from NDR?
Gross Revenue Retention (GRR) measures revenue retention without crediting expansion or upsells. Formula: GRR = [(Starting ARR - Contraction ARR - Churned ARR) / Starting ARR] × 100. GRR can never exceed 100%. While top enterprise SaaS companies boast 120%–135% NDR, their GRR is typically 90%–95%.
What is a healthy SaaS Quick Ratio?
The SaaS Quick Ratio measures growth efficiency by comparing revenue additions against revenue losses: Quick Ratio = (New ARR + Expansion ARR) / (Contraction ARR + Churned ARR). A ratio greater than 4.0 indicates hyper-efficient compounding growth, 2.0 to 4.0 indicates solid growth, while below 2.0 indicates that customer churn is severely eroding acquisition efforts.