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Free subscription growth calculator for SaaS businesses. Project MRR and ARR growth based on new customer acquisition, churn rate, and expansion revenue with detailed financial modeling. Our calculator helps SaaS companies forecast subscription revenue growth and plan for sustainable scaling with accurate projections.
Last updated: February 2, 2026
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Current Business Metrics
Current Monthly Recurring Revenue
Monthly new customer MRR added
Monthly revenue churn rate (3-7% typical for SaaS)
Monthly expansion MRR from upsells/cross-sells (1-3% good)
Projected MRR (Month 12)
$96,996
+$46,996 net new MRR
Projected ARR
$1,163,951
Annual run rate
Growth Rate
94.0%
Over 12 months
MRR Components Breakdown:
New MRR
+$60,000
Churned MRR
-$30,343
Expansion MRR
+$17,339
Net Revenue Retention
74%
NRR (target: greater than 100%)
Avg Monthly Growth
5.7%
Compound monthly rate
Analysis:
Healthy subscription growth with balanced acquisition and retention.
SaaS Growth Tips:
Target Growth
10-20% Monthly
100-400%+ annual growth typical
Target Growth
5-10% Monthly
60-150% annual growth typical
Target Growth
2-5% Monthly
25-80% annual growth typical
$50k starting MRR, $5k new MRR/month, 3.5% churn, 2% expansion over 12 months:
Projected MRR (Month 12)
$96,996
Growth Rate
94%
Our subscription growth calculator projects MRR and ARR growth using compound revenue modeling. The calculation uses SaaS metrics formulas to simulate month-by-month revenue changes from new customer acquisition, churn losses, and expansion gains.
MRR(month) = MRR(month-1) + New MRR - Churned MRR + Expansion MRRChurned MRR = MRR(month-1) × Churn Rate %Expansion MRR = MRR(month-1) × Expansion Rate %Growth Rate = (Ending MRR - Starting MRR) ÷ Starting MRR × 100%The calculator simulates MRR growth month-by-month, compounding the effects of churn and expansion on the growing base. Each month's ending MRR becomes the next month's starting base for churn and expansion calculations, accurately modeling how retention and expansion compound over time.
Shows projected MRR growth over time with acquisition, churn, and expansion components
Subscription growth calculation is based on recursive MRR modeling where each month's revenue depends on the previous month's base plus changes from acquisition, churn, and expansion. The formula MRR(t) = MRR(t-1) × (1 + new_rate - churn_rate + expansion_rate) captures the compound nature of subscription growth. New MRR represents customer acquisition (new revenue added), churn rate represents percentage of existing MRR lost each month (customer cancellations), and expansion rate represents percentage of existing MRR added from upsells and cross-sells. These rates apply to the growing base each month, creating compound effects. For example, 3.5% churn on $50k MRR loses $1,750 in month one, but 3.5% churn on $100k MRR loses $3,500 in month twelve (same rate, different base). Net Revenue Retention (NRR) measures retention including expansion: (Starting MRR - Churned MRR + Expansion MRR) ÷ Starting MRR. NRR above 100% indicates negative net churn where expansion exceeds losses. Growth rate calculation uses ending vs. starting MRR over the period. The calculator accounts for these compound effects to provide accurate long-term projections.
Need help with other financial calculations? Check out our investment growth simulator and startup valuation calculator.
Get Custom Growth Calculator for Your SaaSResult: Strong growth trajectory with healthy retention and expansion
NRR of 74% shows expansion offsetting churn (negative net churn).94% growth over 12 months demonstrates balanced acquisition and retention strategy.
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