Subscription MRR Calculator
What Is This Calculator?
Monthly Recurring Revenue (MRR) is the normalized monthly revenue from all active subscriptions. It is the single most important metric for any subscription business — SaaS, membership sites, subscription boxes, or any model with recurring billing. MRR is not simply total monthly revenue; it specifically counts predictable, recurring subscription revenue and normalizes annual plans to their monthly equivalent. Understanding MRR requires breaking it into components: New MRR (revenue from new customers), Expansion MRR (upgrades and add-ons from existing customers), Churned MRR (revenue lost from cancellations), and Contraction MRR (revenue lost from downgrades). Net New MRR — the sum of new plus expansion minus churn minus contraction — tells you whether your recurring revenue base is growing or shrinking. The best SaaS companies achieve Net Revenue Retention above 100%, meaning their existing customer base generates more revenue over time even without acquiring a single new customer. This is the magic of the subscription model when executed well. Bessemer Venture Partners' Cloud Index tracks public SaaS companies and shows that the median NRR is 110-115%, meaning the average public SaaS company grows revenue from its existing customer base by 10-15% annually without acquiring a single new customer. Companies below 100% NRR are fighting an uphill battle where they must constantly acquire new customers just to replace the revenue walking out the door. This calculator breaks MRR into its components so you can identify whether your growth is coming from healthy new customer acquisition and expansion, or whether it is being undermined by churn you may not be measuring accurately.
How to Use This Calculator
Enter Starting MRR
Add Growth Components
Enter Loss Components
Key Concepts
Net Revenue Retention (NRR)
Revenue from existing customers this month divided by their revenue last month, expressed as a percentage. NRR above 100% means expansion exceeds churn. Top-performing SaaS companies (Snowflake, Twilio, Datadog) achieve 120-170% NRR. The median public SaaS company runs 110-120%.
Gross Revenue Churn
Total MRR lost (cancellations + downgrades) as a percentage of starting MRR. Target below 3% monthly for SMB-focused SaaS, below 1% monthly for enterprise SaaS. Above 5% monthly is unsustainable — you are losing over half your revenue base annually.
ARR (Annual Recurring Revenue)
MRR multiplied by 12. This is the standard metric for SaaS valuations. SaaS companies are typically valued at 5-15x ARR depending on growth rate, NRR, and profitability. A company with $1M ARR growing 100% YoY might command a $10M-$15M valuation.
Quick Ratio (SaaS)
(New MRR + Expansion MRR) divided by (Churned MRR + Contraction MRR). A Quick Ratio above 4 indicates very healthy growth. Between 2-4 is good. Below 2 means churn is consuming too much of your growth. Mamoon Hamid of Kleiner Perkins popularized this metric.
Expansion Revenue
Additional revenue from existing customers through upsells, cross-sells, seat additions, and usage overages. The cheapest revenue you can generate because there is no customer acquisition cost. The best SaaS companies generate 30-40% of new MRR from expansion.
Expert Insights
Track MRR components weekly in a spreadsheet or dashboard, not just monthly. A sudden spike in contraction MRR in week 2 gives you 2-3 weeks to investigate and respond. Discovering it at month-end gives you zero time.
Frequently Asked Questions
Results are estimates for educational purposes only. Actual amounts may vary based on your specific financial situation, market conditions, and other factors. This calculator does not constitute financial advice.
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