Monthly Recurring Revenue (MRR)
This is the monthly predictable revenue a business expects receiving from its customers. Its equivalent is the Annual Recurring Revenue (ARR). The MRR metric is used to track month-by-month revenue changes: new MRR from new customers, churned MRR, contraction MRR, and expansion MRR all from existing customers.
Also, Net New MRR = New MRR (revenue from new subscribers to your product) + Expansion MRR (additional revenue from existing subscribers who have upgraded their feature usage) − Contraction MRR (a downgrade to a lower-tiered service by existing customers) − Churned MRR (revenue loss from customers who discontinued/cancelled their contract).
Generally, MRR = sum of all active subscription revenue normalized to a monthly amount.

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THE HONEST TRUTH
MRR is most relevant when broken into its components, i.e., Churned MRR, Contraction MRR, Expansion MRR, New MRR. Without a holistic number, the headline number can be misleading.
MRR is most relevant when broken into its components, i.e., Churned MRR, Contraction MRR, Expansion MRR, New MRR. Without a holistic number, the headline number can be misleading.