SaaS MRR to ARR Growth Rate Calculator
Simulate monthly recurring revenue expansion, churn impact, and 12-month annualized revenue run rate.
Parameters & Config
Active MRR at the start of the billing month
Monthly revenue from newly acquired signups
Additional revenue from existing customer tier upgrades and add-ons
Lost revenue from cancellations and downgrades during the month
Total MRR achieved at period end after additions and churn
Ending MRR projected over 12 months
Key Metrics & Sub-Totals
3 itemsCalculation Summary & Unit Breakdown
| Metric | Calculated Value | Notes / Logic |
|---|---|---|
| Beginning Monthly Recurring Revenue | $25000.00 | - |
| New Sign-up MRR Added | $4500.00 | New customer bookings |
| Expansion & Upsell MRR | $1500.00 | Tier upgrades |
| Churned & Lost MRR | $1200.00 | Cancellations + contractions |
| Net New Added MRR | $4800.00 | Net expansion |
| Ending Monthly Recurring Revenue | $29800.00 | Current month close |
| Annualized Run Rate (ARR) | $357600.00 | Ending MRR × 12 |
| Net Monthly Growth Rate | 19.2% | Month-over-month |
| SaaS Quick Ratio | 5x | Growth vs Churn efficiency |
Overview & Methodology
Monthly Recurring Revenue (MRR) and Annualized Run Rate (ARR = Ending MRR × 12) are the primary metrics used to value subscription SaaS businesses. Tracking Net New MRR (New + Expansion - Churned) reveals true organic momentum.
Mathematical Formulation
Net New MRR = New MRR + Expansion MRR - Churned MRR. Ending MRR = Starting MRR + Net New MRR. ARR = Ending MRR × 12.Optimization Best Practices
Focus on Net New MRR rather than gross new bookings to prevent hiding high churn behind aggressive paid ad acquisition.
SaaS valuation multiples (typically 6x to 15x ARR) scale exponentially with month-over-month growth velocity.
Aim for Expansion MRR from existing customers to eventually equal or exceed Churned MRR (Net Negative Churn).
Frequently Asked Questions
Q.How is Annual Recurring Revenue (ARR) calculated from MRR?
ARR is calculated simply as your current active Ending Monthly Recurring Revenue (MRR) multiplied by 12.
Q.What is a good month-over-month MRR growth rate for early SaaS?
For startups under $50k MRR, 10% to 15% month-over-month growth is top quartile. For scaling companies ($1M+ ARR), 5% to 8% monthly is strong.
Q.What is Net New MRR?
Net New MRR is the net change in your recurring revenue base: New Customer MRR + Expansion MRR minus Churned/Downgraded MRR.