Annual recurring revenue at the start of the period.
Revenue Additions
ARR from new logos acquired.
Upsells, cross-sells, seat expansion.
Revenue Losses
ARR from lost customers.
Downgrades from existing customers.
Your Results
Enter ARR components to calculate metrics.
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What This Calculator Does
This ARR growth calculator builds a complete annual recurring revenue bridge showing how beginning ARR changes through new customer additions, expansion revenue (upsells, cross-sells, seat growth), churned revenue (lost customers), and contraction (downgrades). It calculates ending ARR, net new ARR, net revenue retention (NRR), gross revenue retention (GRR), and ARR growth rate with 2026 SaaS performance benchmarks.
The Formula
The ARR bridge decomposes revenue changes into four components: new (from new logos), expansion (from existing customers spending more), churn (from lost customers), and contraction (from existing customers spending less). NRR measures total revenue change from existing customers including expansion. GRR measures revenue retained excluding any expansion. NRR above 100% means existing customers are generating more revenue over time even without new sales.
Step-by-Step Example
Enter beginning ARR
Start of period ARR: $2,000,000.
Add revenue components
New ARR: $600,000. Expansion: $300,000. Churned: $200,000. Contraction: $50,000.
Calculate metrics
Ending ARR: $2,650,000. Net new ARR: $650,000. Growth: 32.5%.
Analyze retention
NRR: 102.5% (existing customers grew). GRR: 87.5%. Implied monthly churn: 0.83%.
Real-World Use Cases
Board and Investor Reporting
Present a clear ARR bridge showing the sources of growth and the relative contribution of new business vs. expansion vs. churn impact.
Retention Program Evaluation
Track NRR and GRR quarter over quarter to measure the effectiveness of customer success and retention initiatives.
Growth Planning
Model different scenarios for new sales targets, expansion rates, and churn reduction to plan headcount and budget allocation.
Common Mistakes to Avoid
Confusing NRR with GRR. GRR can never exceed 100% (it only measures retention). NRR can exceed 100% when expansion outpaces churn, which is the gold standard for SaaS.
Not breaking out contraction from churn. A customer downgrading from $1,000/month to $500/month is contraction, not churn. Treating it as churn overstates customer loss severity.
Measuring ARR growth without segmenting by cohort. Blended metrics can mask declining performance in newer cohorts if legacy customers have strong retention.
Including one-time revenue in ARR. ARR should only include recurring, committed revenue. Implementation fees, professional services, and one-time charges should be excluded.
Frequently Asked Questions
Accuracy and Disclaimer
ARR calculations are based on the data provided. Ensure consistent definitions for new, expansion, churn, and contraction revenue across reporting periods. ARR should follow your company accounting policy for revenue recognition.
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