Rule of 40 Calculator
Rule of 40 Calculator for SaaS: add your revenue growth rate to your profit margin and see instantly whether your company clears the 40% benchmark.
Reviewed by Daniel Agrici, Founder & Lead Developer
Formula
Rule of 40 Score = Revenue Growth Rate (%) + Profit Margin (%)
The Rule of 40 adds your year-over-year revenue growth rate to your profit margin (typically EBITDA margin). A combined score of 40 or higher indicates a healthy balance between growth and profitability for a SaaS company.
Worked Examples
Example 1: High-Growth, Low-Profit Company
Problem:A SaaS company is growing at 55% year-over-year with a -10% EBITDA margin. Do they pass the Rule of 40?
Solution:Revenue Growth Rate = 55%\nEBITDA Margin = -10%\nRule of 40 Score = 55 + (-10) = 45\nThreshold = 40\n45 >= 40, so the company PASSES\nThe high growth rate more than compensates for the negative margin.
Result:Score: 45 (Passes) | Growth compensates for losses | Should maintain growth while gradually improving margins
Example 2: Mature, Profitable Company
Problem:A mature SaaS company grows at 12% year-over-year with a 22% EBITDA margin. Evaluate against the Rule of 40.
Solution:Revenue Growth Rate = 12%\nEBITDA Margin = 22%\nRule of 40 Score = 12 + 22 = 34\nThreshold = 40\n34 < 40, so the company FAILS\nGap to 40 = 40 - 34 = 6 points\nNeeds either 6% more growth or 6% more margin to pass.
Result:Score: 34 (Fails by 6 points) | Needs to improve growth to 18% or margin to 28% to pass
Frequently Asked Questions
What is the Rule of 40 for SaaS companies?
The Rule of 40 is a widely used benchmark in the SaaS industry that states a healthy software company should have its combined revenue growth rate and profit margin equal to or exceed 40 percent. For example, a company growing at 50 percent with a negative 10 percent profit margin scores 40 and passes the test. Similarly, a company growing at 20 percent with a 20 percent profit margin also scores 40. The rule was popularized by venture capitalist Brad Feld and has become a standard metric that investors, board members, and executives use to evaluate the balance between growth and profitability in SaaS businesses.
How is the Rule of 40 calculated?
The Rule of 40 is calculated by adding two key metrics together: the year-over-year revenue growth rate (expressed as a percentage) and the profit margin (also expressed as a percentage). The formula is simply Rule of 40 Score = Revenue Growth Rate + Profit Margin. Revenue growth is typically measured as ARR or MRR growth year-over-year. Profit margin can be measured using EBITDA margin, operating margin, or free cash flow margin depending on the context. EBITDA margin is the most commonly used measure. If the resulting sum equals 40 or higher, the company passes the Rule of 40 test.
Should I prioritize growth or profitability for the Rule of 40?
The optimal balance between growth and profitability depends on your company stage, market conditions, and competitive dynamics. Early-stage companies (under $10 million ARR) typically prioritize growth heavily, often accepting negative margins of 20 to 40 percent if growth exceeds 60 to 80 percent annually. Growth-stage companies ($10 million to $100 million ARR) should aim for balanced improvement in both metrics. Mature companies (above $100 million ARR) typically see growth rates decline naturally and must shift toward profitability. Research shows that investors generally value an additional point of growth more highly than an additional point of margin, so growth is slightly preferred when both options are available.
What profit margin metric should I use for Rule of 40?
The most commonly used profit margin metric for the Rule of 40 is EBITDA margin (Earnings Before Interest, Taxes, Depreciation, and Amortization as a percentage of revenue). EBITDA margin is preferred because it normalizes for differences in capital structure, tax situations, and accounting methods across companies. Some analysts prefer free cash flow margin because it captures actual cash generation including working capital changes. Operating margin (EBIT margin) is another valid option. For consistency when comparing against industry benchmarks, use EBITDA margin. For internal decision-making, free cash flow margin may provide a more accurate picture of financial health.
References
Reviewed by Daniel Agrici, Founder & Lead Developer · Editorial policy