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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Introduction
Annual Recurring Revenue growth rate is the metric that separates fundable SaaS businesses from lifestyle businesses. A company at $500K ARR growing 15% annually is a small business. A company at the same $500K ARR growing 150% annually is a startup. Investors, acquirers, and finance teams use ARR growth rate not just to measure performance but to project trajectory and determine valuation. According to Bessemer Venture Partners' State of the Cloud Report, the rule-of-thumb for Series A readiness is $1M ARR growing 100%+ year-over-year. For Series B, $5M to $10M ARR growing 80% to 100% is the benchmark. The underlying math of ARR growth is not complex. What trips up founders is not knowing which growth rate to report (YoY vs. MoM annualized), how to adjust for churn, and what growth rate is actually needed to hit a revenue target by a specific date.
What This Calculator Does
This calculator computes current ARR from MRR, projects ARR over 12 to 36 months at a given growth rate, calculates the month-over-month growth rate needed to hit a target ARR by a specific date, and shows the compounding effect of churn on gross ARR growth. It outputs year-over-year ARR growth percentage, projected ARR at 12, 24, and 36 months, required monthly growth rate to achieve a target, and new ARR needed per month at current growth rates. It uses 2026 SaaS benchmarks from Bessemer Venture Partners and OpenView.
The Formula
ARR is MRR multiplied by 12, representing the annualized run rate of current subscriptions. Year-over-year growth compares ARR on the same calendar date 12 months apart. The required monthly growth rate uses the compound growth formula: to go from $500K to $2M ARR in 24 months requires a monthly growth rate of ($2M / $500K)^(1/24) - 1 = 7.18% per month. This is a compounding calculation, not a division. Projections use the same compound formula forward, showing the exponential effect of consistent monthly growth rates.
Step-by-Step Example
Calculate your current ARR from MRR
Example: Current MRR $41,500. ARR = $41,500 × 12 = $498,000. This is your current annualized run rate, not the revenue you collected in the past 12 months, which may differ due to growth.
Calculate year-over-year ARR growth rate
ARR one year ago: $215,000. Current ARR: $498,000. YoY growth = ($498,000 - $215,000) / $215,000 × 100 = 131.6%. This is in the range for Series A consideration per Bessemer benchmarks for a sub-$1M ARR company.
Project ARR at 12, 24, and 36 months
Assume 8% monthly growth rate. Month 12: $498,000 × (1.08)^12 = $1,256,000. Month 24: $498,000 × (1.08)^24 = $3,167,000. Month 36: $498,000 × (1.08)^36 = $7,984,000. This assumes consistent growth, which requires increasing absolute new ARR each month since the base grows.
Calculate required growth rate to hit a target
Target: $3M ARR in 24 months. Current: $498,000. Required monthly growth rate = ($3,000,000 / $498,000)^(1/24) - 1 = 7.95%/month. To put this in perspective: 7.95% monthly growth means new ARR added each month must increase from $39,840 (current month at 8%) to $237,600 by month 24. This requires either volume scaling, price increases, or both.
Real-World Use Cases
Series A Fundraise Timeline Planning
A SaaS founder targeting a Series A at $2M ARR models the required growth rate. Current ARR: $450K. Target: $2M in 18 months. Required monthly growth: ($2M / $450K)^(1/18) - 1 = 9.3%/month. The calculator shows that consistent 9.3% monthly growth requires adding $41,850 in net new ARR in month one, rising to $175,000 in month 18. Knowing this, the founder can reverse-engineer the sales capacity, marketing spend, and conversion rates needed to sustain that growth.
Tracking Growth Efficiency Decline
A growth-stage SaaS company monitors ARR growth rate monthly and spots a deceleration from 12% monthly to 7% over 6 months. Running the calculator shows this shifts their 36-month ARR projection from $48M to $19M. The deceleration signals that current channels are saturating and new growth vectors must be identified before the trend continues.
Acquisition Valuation Reverse-Engineering
A strategic acquirer offering 8x ARR for a SaaS business with $2.4M ARR implies a $19.2M valuation. The target company uses the ARR growth calculator to show that at its current 95% YoY growth rate, ARR will be $4.68M in 12 months. If the acquirer's 8x multiple holds, the same business is worth $37.4M in one year. This analysis forms the foundation for arguing against a full-price sale versus a partial sale or fundraise.
Comparison
| ARR Stage | Good YoY Growth | Strong YoY Growth | Typical Series Benchmark | Rule of 40 Target |
|---|---|---|---|---|
| < $1M ARR | >80% | >150% | Series A: >100% YoY | N/A (growth only phase) |
| $1M-$5M ARR | >60% | >100% | Series B: >80% YoY | >40 |
| $5M-$20M ARR | >40% | >80% | Series C: >60% YoY | >40 |
| $20M-$100M ARR | >25% | >50% | Growth Equity: >30% YoY | >40 |
| $100M+ ARR | >15% | >30% | IPO-ready: >20% YoY | >40 |
Common Mistakes to Avoid
Conflating bookings with ARR. New ARR from a signed annual contract is recognized ratably over the contract term, not at signing. A $120,000 annual contract signed on December 1 contributes $10,000 to December MRR and $10,000 to each subsequent month, not $120,000 in December. Reporting bookings as ARR inflates growth metrics and creates expectation mismatches with investors.
Not adjusting ARR for churn in growth rate calculations. Gross new ARR and net new ARR are different numbers. If you added $200,000 in new ARR but lost $80,000 to churn, your net new ARR is $120,000. Growth rates calculated on gross new ARR without subtracting churn will overstate real growth by a factor proportional to churn rate.
Reporting ARR growth rate from a low base period that inflates the percentage. A company that went from $10,000 to $100,000 ARR did not grow 900%. Context matters. Investors look at both absolute ARR and growth rate. A 300% growth rate on $50,000 ARR is less meaningful than 80% growth on $2M ARR.
Using ARR growth rate without the Rule of 40 sanity check. The Rule of 40 states that revenue growth rate plus profit margin (or free cash flow margin) should equal or exceed 40% for a healthy SaaS business. A company growing 80% but burning 50% of revenue fails the Rule of 40. Growth rate in isolation can mask unsustainable burn.
Frequently Asked Questions
Accuracy and Disclaimer
ARR growth projections in this calculator are mathematical extrapolations of current growth rates and do not account for market saturation, competitive dynamics, or operational constraints. Actual ARR growth depends on execution, product-market fit, and market conditions. These projections are planning tools only and are not suitable for use in audited financial statements, SEC filings, or investor-grade financial models without professional review. Consult a qualified CFO or investment banker for fundraising-related financial projections.
Conclusion
ARR growth rate is a backwards-looking metric that tells you how fast the business has been growing. What matters is building the model that shows how you get to the next milestone. If you are planning for a fundraise or acquisition, use the Subscription Revenue Forecast Calculator to model the specific subscriber additions and churn scenarios that produce your target ARR trajectory. Then use the LTV to CAC Ratio Calculator to verify that the acquisition spend required to hit that growth rate is economically sustainable given your current unit economics.
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