SaaS MRR Calculator
Calculate MRR, ARR, net growth, and months to target. Factor in churn and new customer acquisition.
What is SaaS MRR Calculator?
A SaaS MRR (Monthly Recurring Revenue) calculator tracks the key financial metric for subscription businesses. MRR is the predictable revenue your business generates each month from active subscriptions. This tool calculates MRR, ARR (Annual Recurring Revenue = MRR × 12), net MRR growth (accounting for new customers, expansions, contractions, and churn), and projects future MRR based on current growth rates. For SaaS businesses, MRR growth rate is often more important than absolute revenue because it predicts future scale.
How It Works
Enter your current number of customers and average revenue per user (ARPU) to calculate base MRR. Then input monthly new customers, expansion revenue, and churn rate to see net MRR movement. The tool calculates: Net New MRR = New MRR + Expansion MRR - Churn MRR - Contraction MRR. It projects future MRR at current growth rates and shows how many months until you reach target MRR milestones. The quick ratio (new + expansion) / (churn + contraction) indicates growth efficiency — above 4 is excellent.
Common Use Cases
- •Tracking monthly SaaS business health through MRR and growth rate trends
- •Forecasting future revenue for financial planning, hiring, and fundraising
- •Understanding the impact of churn rate on long-term revenue trajectory
- •Calculating the MRR milestone timeline for board reporting and investor updates
- •Modeling the revenue impact of pricing changes or new plan tier introductions
- •Evaluating the quick ratio to determine if growth is sustainable or churn-driven decay
Frequently Asked Questions
How is MRR calculated?▼
MRR = Number of customers × Average Revenue Per User (ARPU). Net MRR accounts for new revenue minus churned revenue.
How is MRR calculated correctly?▼
Normalise every subscription to a monthly figure and add them up: an annual plan at £1,200 contributes £100 of MRR, not £1,200 in the month it was paid. Exclude one-off fees, setup charges and usage overages, which are not recurring by definition.
What is net revenue retention and why does it matter more than churn?▼
Net revenue retention combines churn, downgrades and expansion from existing customers. Above 100% means your existing base grows revenue by itself even with no new customers, which is the strongest signal in a subscription business. Gross churn alone hides that expansion.
What is the difference between customer churn and revenue churn?▼
Customer churn counts accounts lost; revenue churn counts the money lost. Losing ten small customers and one enterprise account can mean modest customer churn and severe revenue churn. Track both, because they answer different questions.
How do I calculate the LTV to CAC ratio?▼
Lifetime value is roughly gross margin per customer divided by monthly churn rate; customer acquisition cost is total sales and marketing spend divided by new customers acquired. A ratio of 3:1 or better is the conventional benchmark, along with a payback period under about 12 months.
Should MRR be quoted before or after discounts?▼
After. MRR should reflect what customers actually pay, so committed discounts reduce it. Quoting list-price MRR overstates the business and produces a reconciliation problem the moment anyone compares it to cash received.
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