Engine CFM Calculator

Our Carburetor CFM Calculator is a powerful tool designed to help you determine the required airflow (in cubic feet per minute, CFM) for your engine’s carburetor. CFM calculation is essential for ensuring optimal engine performance and efficiency.

Table of Contents


Maximum Engine RPM:

Engine Size in Cubic Inches:

Volumetric Efficiency (in percentage):


Carb CFM:

How to Use:

  1. Enter Engine Information: Input the maximum engine RPM, engine size in cubic inches, and volumetric efficiency (in percentage).
  2. Click “Calculate CFM”: Once you’ve entered the required information, click the button to calculate CFM.
  3. View Results: The tool will quickly compute the required CFM for your engine’s carburetor and display the result.

Example Calculation:

Let’s consider the following engine specifications:

  • Maximum Engine RPM: 6000
  • Engine Size (Cubic Inches): 350
  • Volumetric Efficiency: 85%

Using the formula:

CFM=Max RPM×Engine Size3456×(Efficiency100)CFM=3456Max RPM×Engine Size​×(100Efficiency​)



Result: The required CFM for the carburetor is approximately 1281.25.

Use our Carburetor CFM Calculator to ensure your engine receives the correct airflow for optimal performance and efficiency.

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