Customer Churn, Gross Revenue Retention and NRR Calculator
Reviewed by Finin2min Editorial Desk · Last reviewed 11 August 2026
Calculate logo churn, gross revenue retention and net revenue retention from beginning customers and MRR movements.
Retention inputs
Logo churn
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Net revenue retention
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Gross revenue retention
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Calculation guidance will appear here.
How This Is Calculated
Logo churn = customers lost ÷ starting customers. Gross Revenue Retention (GRR) = (starting MRR − churned MRR − contraction) ÷ starting MRR, capped conceptually at 100% since it excludes expansion. Net Revenue Retention (NRR) additionally adds back expansion revenue, and can exceed 100% if expansion from existing customers outpaces churn and contraction combined.
Frequently Asked Questions
What is the difference between GRR and NRR?
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GRR (Gross Revenue Retention) measures revenue retained from existing customers, excluding any upsell/expansion — it can never exceed 100%. NRR (Net Revenue Retention) additionally includes expansion revenue from existing customers, and can exceed 100% if expansion outweighs churn and contraction.
Why can NRR be a more important metric than new customer growth for SaaS companies?
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Because NRR above 100% means the existing customer base alone is growing revenue even before counting any new customer acquisition — a business with strong NRR can compound growth efficiently from its installed base, which is generally cheaper than acquiring entirely new customers.
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Scope: Computes customer/revenue churn rate, Gross Revenue Retention (GRR) and Net Revenue Retention (NRR) — key SaaS metrics for assessing the health of the existing customer base.
Calculation logic
Gross Revenue Retention = (Starting period revenue − Revenue lost to downgrades and cancellations) ÷ Starting period revenue, expressed as a percentage (expansion revenue is excluded, so GRR cannot exceed 100%).
Net Revenue Retention = (Starting period revenue − Revenue lost to downgrades/cancellations + Expansion revenue from upsells/cross-sells) ÷ Starting period revenue — NRR can exceed 100% if expansion outweighs churn.
Customer churn rate = Number of customers lost in the period ÷ Number of customers at the start of the period.
Inputs and assumptions
Revenue and customer figures for the calculation should be from the same cohort/period start-point that the user is measuring retention against, per standard SaaS metric convention.
New customers acquired during the period are excluded from the retention base by definition — GRR/NRR measure only what happens to the existing customer base.
Exclusions and edge cases
Does not automatically cohort customers by signup month — the user provides the starting-period revenue/customer base to be measured.
Logo churn (customer count) and revenue churn (dollar amount) can diverge significantly, especially with usage-based pricing — the calculator computes both so they aren't conflated.
Sources
No external regulatory source applies — this is a general financial formula, not a statutory computation.
Review status: reviewed and approved by CA Nikhil Gupta on 18 July 2026.
Guides that use this calculator
Background, worked examples and the rules behind these numbers.