Monthly Recurring Revenue (MRR)

Monthly Recurring Revenue (MRR) is the normalized, predictable revenue a subscription business generates each month from all active customer subscriptions — the single most important health metric in SaaS because it converts lumpy, varied billing cycles (monthly, annual, quarterly) into one comparable monthly number. An annual subscription of $1,200/year contributes $100 to MRR; a monthly subscription of $50/month contributes $50. MRR is typically broken into components that reveal the underlying health of the business far better than the topline number alone: New MRR (from new customers this month), Expansion MRR (existing customers upgrading — more seats, higher tier), Contraction MRR (existing customers downgrading), and Churned MRR (customers who canceled). The formula for Net New MRR in a given month is: New + Expansion − Contraction − Churned. A SaaS business with $100K MRR growing at 10% month-over-month via new sales but losing 15% to churn every month is actually shrinking — a distinction the topline number hides but the components reveal. MRR is also the input to Annual Recurring Revenue (ARR = MRR × 12), which investors and boards use for annualized comparisons, and to the Rule of 40 (growth rate % + profit margin % should exceed 40 for a healthy SaaS business). Concrete worked example: in January, a SaaS company has $50,000 MRR from 500 customers at $100/month average. In February: 40 new customers sign up at $100/month (+$4,000 New MRR); 10 existing customers upgrade to a $200/month plan (+$1,000 Expansion MRR); 5 customers downgrade from $200 to $100 (−$500 Contraction MRR); 15 customers cancel entirely (−$1,500 Churned MRR, assuming $100 average). Net New MRR = $4,000 + $1,000 − $500 − $1,500 = $3,000. February MRR = $53,000. Tracking these components monthly in a dashboard (via Stripe + a tool like ChartMogul or Baremetrics) is standard practice for any subscription SaaS business past its first few customers. One subtlety builders often get wrong early: MRR should be normalized, not just summed from raw invoice amounts — a customer who prepays for a full year upfront still only contributes 1/12th of that payment to MRR each month, and a one-time setup fee or non-recurring professional-services charge should be excluded from MRR entirely, since including either inflates the metric with revenue that won't repeat next month and misleads anyone using MRR to forecast forward. Usage-based SaaS businesses complicate MRR further, since consumption can vary meaningfully month to month even for a loyal, non-churning customer — most usage-based companies report an estimated or trailing-average MRR figure specifically to smooth out this natural noise, rather than a hard committed number the way a fixed seat-based subscription provides.