How To Calculate Average Monthly Growth Rate

Calculate the compound monthly growth rate (CMGR) for your business metrics with precision

How to Calculate Average Monthly Growth Rate: Complete Guide

The average monthly growth rate (often calculated as Compound Monthly Growth Rate or CMGR) is a critical financial metric that helps businesses, investors, and analysts understand performance trends over time. Unlike simple growth calculations that only consider the difference between starting and ending values, CMGR accounts for the compounding effect that occurs over multiple periods.

Why Monthly Growth Rate Matters

Understanding your monthly growth rate provides several key benefits:

• Performance Benchmarking: Compare your growth against industry standards or competitors
• Financial Planning: Create more accurate forecasts and budgets based on historical trends
• Investment Analysis: Evaluate the potential return on investments with compounding effects
• Business Valuation: Determine company worth based on consistent growth patterns
• Goal Setting: Establish realistic targets for revenue, user acquisition, or other KPIs

The CMGR Formula Explained

The compound monthly growth rate formula is derived from the compound annual growth rate (CAGR) formula but adjusted for monthly periods:

CMGR = (Final Value / Initial Value)^{(1 / Number of Months)} – 1

Where:
• Final Value = Ending value of the period
• Initial Value = Starting value of the period
• Number of Months = Total time period in months

For example, if your business grew from $10,000 to $15,000 over 12 months:

1. Divide final by initial: 15000 / 10000 = 1.5
2. Calculate the root: 1.5^(1/12) ≈ 1.0348
3. Subtract 1: 1.0348 – 1 = 0.0348
4. Convert to percentage: 0.0348 × 100 = 3.48%

Monthly vs. Annual Growth Rates

Metric	Monthly Growth Rate	Annual Growth Rate
Time Horizon	Short-term (1 month)	Long-term (1 year)
Compounding Effect	More visible	Less visible
Volatility	Higher (more sensitive)	Lower (smoothed out)
Use Cases	Operational decisions, quick adjustments	Strategic planning, investor reporting
Calculation Frequency	12 times per year	Once per year

While annual growth rates (like CAGR) are commonly reported in financial statements, monthly growth rates provide more granular insights that are particularly valuable for:

• Startups and high-growth companies needing to track progress frequently
• Subscription businesses monitoring monthly recurring revenue (MRR)
• Marketing teams evaluating campaign performance month-over-month
• Investors analyzing short-term performance trends

Real-World Applications

1. SaaS Business Metrics

For Software-as-a-Service companies, monthly growth rate calculations are essential for tracking:

• Monthly Recurring Revenue (MRR) Growth: The percentage increase in subscription revenue each month
• Customer Churn Rate: The percentage of customers lost each month (negative growth)
• Customer Acquisition Cost (CAC) Payback: How quickly new customer revenue covers acquisition costs
• Net Revenue Retention (NRR): Growth from existing customers after accounting for churn

Sample SaaS Growth Metrics (2023 Industry Benchmarks)

Metric	Top Quartile	Median	Bottom Quartile
MRR Growth Rate	15%+	8-12%	<5%
Net Revenue Retention	120%+	100-110%	<90%
Customer Churn (Monthly)	<1%	2-3%	>5%
CAC Payback Period	<12 months	12-18 months	>24 months

2. Investment Portfolio Analysis

Investors use monthly growth rates to:

• Compare performance across different assets
• Identify trends in volatile markets
• Calculate dollar-cost averaging strategies
• Assess risk-adjusted returns

For example, an investment growing from $50,000 to $65,000 over 18 months would have:

• Total growth: 30% ($15,000 gain)
• Monthly growth rate: 1.53% (calculated using CMGR)
• Annualized growth: 19.56% (1.0153¹² – 1)

3. E-commerce Performance Tracking

Online stores monitor monthly growth for:

• Revenue per visitor
• Average order value
• Conversion rates
• Customer lifetime value
• Return customer rate

Common Mistakes to Avoid

1. Using simple division: Dividing total growth by number of months ignores compounding effects. A 100% total growth over 12 months isn’t 8.33% monthly (that would actually compound to 213% annual growth).
2. Mixing time periods: Ensure all values use the same time units (months vs. years). Converting between them requires proper annualization.
3. Ignoring negative values: If your initial value is negative (like negative cash flow), the formula breaks down. Use absolute values or specialized financial metrics instead.
4. Overlooking seasonality: Monthly growth rates can be misleading without considering seasonal patterns (e.g., retail in December vs. January).
5. Confusing nominal vs. real growth: Inflation isn’t accounted for in basic CMGR calculations. For real growth rates, adjust for inflation.

Advanced Applications

1. Weighted Average Growth Rates

When you have multiple data points with different weights (importance), use a weighted average formula:

Weighted CMGR = Σ (w_i × CMGR_i) / Σ w_i

Where w_i represents the weight of each component

2. Growth Rate Smoothing

To reduce volatility in monthly growth rates, apply moving averages:

• 3-month moving average: (Month1 + Month2 + Month3) / 3
• 6-month moving average: More smoothing for seasonal businesses
• 12-month moving average: Eliminates seasonality completely

3. Growth Rate Decomposition

Break down overall growth into components:

• Volume effect: Growth from selling more units
• Price effect: Growth from price increases
• Mix effect: Growth from changing product mix

Authoritative Sources on Growth Rate Calculations

U.S. Bureau of Labor Statistics – CPI Calculator

The official BLS inflation calculator helps adjust nominal growth rates for inflation to calculate real growth. Essential for economic analysis.

MIT Sloan School of Management – Financial Calculations

MIT’s finance resources provide academic rigor to growth rate calculations, including compound growth formulas and their applications in corporate finance.

U.S. Securities and Exchange Commission – Financial Reporting

The SEC’s guide on compound interest explains regulatory expectations for growth rate disclosures in financial statements.

Frequently Asked Questions

1. How is monthly growth rate different from compound annual growth rate (CAGR)?

While both account for compounding, CAGR measures growth over at least one year, while monthly growth rate looks at shorter periods. You can annualize monthly growth by compounding it 12 times: (1 + monthly rate)¹² – 1 = annualized rate.

2. Can monthly growth rates exceed 100%?

Yes, though it’s uncommon for established businesses. Startups in hypergrowth phases (like some tech companies) may experience monthly growth rates over 100%, meaning they more than double each month. For example, growing from $1,000 to $2,500 in one month represents a 150% monthly growth rate.

3. How do I calculate growth rate with negative numbers?

When dealing with negative values (like negative cash flow), standard growth rate formulas don’t work. Alternatives include:

• Using absolute values if the sign doesn’t matter
• Calculating the change in absolute terms instead of percentage
• For financial metrics, using specialized ratios like burn rate instead

4. What’s a good monthly growth rate for a startup?

Good growth rates vary by industry and stage:

• Pre-revenue startups: Focus on user growth (5-15% MoM)
• Early-stage SaaS: 10-20% MRR growth is excellent
• E-commerce: 5-10% revenue growth is strong
• Mature companies: 1-3% monthly growth is typical

Venture capitalists often look for at least 15-20% monthly growth in early-stage startups they consider for investment.

5. How does seasonality affect monthly growth calculations?

Seasonal businesses (like retail or tourism) experience predictable fluctuations. To get meaningful insights:

• Compare to the same month in previous years (YoY growth)
• Use 12-month moving averages to smooth seasonality
• Calculate seasonality indices to adjust expectations
• Focus on year-over-year comparisons rather than month-over-month for seasonal businesses

Practical Tips for Using Growth Rates

1. Track consistently: Use the same calculation method every month for comparable data
2. Visualize trends: Plot growth rates on charts to spot patterns and anomalies
3. Segment your data: Calculate growth rates for different customer segments, products, or regions
4. Set realistic targets: Base goals on historical growth rates adjusted for market conditions
5. Combine with other metrics: Growth rate alone doesn’t tell the full story – combine with profitability, churn, and efficiency metrics
6. Account for outliers: Remove or adjust for one-time events that distort growth calculations
7. Use rolling periods: Calculate 3-month or 6-month growth rates to smooth short-term volatility

Alternative Growth Metrics

While CMGR is powerful, consider these alternatives depending on your needs:

• Simple Monthly Growth: (Final – Initial)/Initial – ignores compounding but is easier to calculate
• Year-over-Year (YoY) Growth: Compares to the same month in the previous year, eliminating seasonality
• Trailing Twelve Months (TTM): Growth calculated over the most recent 12 months, regardless of fiscal year
• Revenue Growth Rate: Specifically measures sales growth, often reported quarterly
• User Growth Rate: Tracks active user base expansion, critical for subscription businesses
• Gross Merchandise Volume (GMV) Growth: Used by marketplaces to measure total sales value growth

Calculating Growth Rates in Spreadsheets

Most spreadsheet programs have built-in functions for growth calculations:

Microsoft Excel

• Basic growth rate: =((final-initial)/initial)
• CMGR: =((final/initial)^(1/periods))-1
• XIRR function: For irregular cash flow growth calculations
• GROWTH function: Predicts exponential growth based on existing data

Google Sheets

• Same formulas as Excel work in Google Sheets
• Array formulas: Can calculate growth across multiple periods simultaneously
• SPARKLINE: Create mini-charts to visualize growth trends

For complex financial modeling, consider using Excel’s Data Table or Scenario Manager features to test how changes in growth rates affect your projections.

Growth Rate Benchmarks by Industry

Understanding typical growth rates in your industry helps set realistic expectations:

Industry Growth Rate Benchmarks (2023 Data)

Industry	Typical Monthly Growth (Mature Companies)	High-Growth Companies	Key Metric
Software (SaaS)	1-3%	10-20%	MRR Growth
E-commerce	2-5%	15-30%	Revenue Growth
Manufacturing	0.5-2%	5-10%	Production Volume
Healthcare	1-4%	8-15%	Patient Volume
Financial Services	0.8-3%	6-12%	AUM Growth
Retail (Brick & Mortar)	0.3-1.5%	3-8%	Same-Store Sales
Biotechnology	2-6%	20-50%+	R&D Pipeline Growth

Note that these benchmarks represent typical performance. Economic conditions, competitive landscape, and company-specific factors can significantly impact actual growth rates.

Future Growth Projections

Once you’ve calculated historical growth rates, you can project future performance:

1. Linear projection: Assume the same absolute growth each period
2. Compounding projection: Apply the growth rate to each subsequent period (more accurate for most business cases)
3. Regression analysis: Use statistical methods to identify growth trends and patterns
4. Scenario analysis: Create best-case, worst-case, and most-likely scenarios

For compounding projections, use the formula:

Future Value = Present Value × (1 + Growth Rate)ⁿ

Where n = number of future periods

Remember that projections become less accurate the further into the future you go. Most businesses find 12-24 month projections most useful for planning purposes.

Tools for Growth Rate Analysis

While manual calculations work, these tools can streamline growth analysis:

• Spreadsheet software: Excel, Google Sheets (with templates available)
• Business intelligence tools: Tableau, Power BI, Looker
• Financial modeling software: Finmark, Jirav, Vena
• SaaS metrics tools: Baremetrics, ChartMogul, ProfitWell
• E-commerce analytics: Google Analytics, Shopify Analytics, Kissmetrics
• Investment platforms: Bloomberg Terminal, Morningstar, Yahoo Finance

For most small businesses, starting with spreadsheet templates is cost-effective before investing in specialized software.

Case Study: Calculating Growth for a Subscription Business

Let’s examine a practical example for a SaaS company:

Month | MRR | MoM Growth | 3-Mo Avg
————————————————————-
Jan 2023 | $12,500 | – | –
Feb 2023 | $13,200 | 5.6% | –
Mar 2023 | $14,000 | 6.1% | 5.85%
Apr 2023 | $14,500 | 3.6% | 5.1%
May 2023 | $15,500 | 6.9% | 5.53%
Jun 2023 | $16,800 | 8.4% | 6.3%
Jul 2023 | $17,500 | 4.2% | 6.5%
Aug 2023 | $18,500 | 5.7% | 6.5%
Sep 2023 | $19,800 | 7.0% | 7.03%
Oct 2023 | $21,000 | 6.1% | 6.93%
Nov 2023 | $23,000 | 9.5% | 7.53%
Dec 2023 | $25,500 | 10.9% | 8.83%

Key insights from this data:

• The 3-month moving average smooths out monthly volatility
• December shows strong growth, possibly due to annual subscriptions
• The business is accelerating growth (higher averages over time)
• Single-month dips (like April) are less concerning in context

Calculating the overall CMGR for this period:

• Initial MRR (Jan): $12,500
• Final MRR (Dec): $25,500
• Periods: 12 months
• CMGR = (25500/12500)^(1/12) – 1 ≈ 7.2% monthly

Final Thoughts

Mastering monthly growth rate calculations provides a powerful lens to view your business performance. By understanding not just the formula but also its applications, limitations, and contextual factors, you can:

• Make data-driven decisions about resource allocation
• Identify emerging trends before they become obvious
• Set realistic yet ambitious growth targets
• Communicate performance effectively to stakeholders
• Build more accurate financial forecasts
• Benchmark against competitors and industry standards

Remember that growth rates are just one metric in your analytical toolkit. Combine them with profitability measures, customer satisfaction scores, and operational efficiency metrics for a complete picture of business health.

For businesses experiencing rapid growth, consider implementing more sophisticated analytics like cohort analysis, customer lifetime value calculations, and predictive modeling to maintain sustainable growth trajectories.