Cubic Feet per Minute to Horsepower Calculator

This calculator converts engine displacement in cubic feet per minute (CFM) to horsepower (HP), helping you determine engine performance based on airflow capacity.

Input Parameters

Calculation Results

Calculation Formula

Horsepower (HP) ≈ CFM × 0.635 + BHP × 1.5

Where:
CFM: Cubic Feet per Minute of air flow
BHP: Brake Horsepower of the engine
The formula provides an estimation of horsepower based on airflow capacity

Note: This calculation provides an estimation and actual performance may vary based on engine design and other factors.

Cubic Feet per Minute to Horsepower Calculator Calculator Usage Guide

Learn how to use the Cubic Feet per Minute to Horsepower Calculator calculator and its working principles

How to Use This Calculator

  1. Enter the engine's Cubic Feet per Minute (CFM) value in the first input field. This represents the volumetric airflow rate through the engine's intake system.
  2. If you know the engine's Brake Horsepower (BHP), enter that value in the second input field. This provides a reference point for more accurate calculation.
  3. Click the "Calculate" button to compute the estimated horsepower.
  4. The result will be displayed in the "Estimated Horsepower (HP)" field.

Working Principle

This calculator uses a simplified formula that relates airflow capacity (CFM) to engine power (HP). The formula is:

HP ≈ CFM × 0.635 + BHP × 1.5

The CFM value is multiplied by 0.635 to convert airflow volume to approximate power, while the BHP value is weighted more heavily to account for existing power output. This provides an estimation of how CFM relates to horsepower in general engine design.

Applications

This calculator is useful for:

  • Engine builders who need to estimate power output based on intake system capacity
  • Performance enthusiasts evaluating engine modifications
  • Automotive technicians assessing engine performance

Important Note: This calculation provides an estimation based on a generalized formula. Actual engine performance depends on many factors including compression ratio, camshaft design, valve size, ignition timing, and more. For precise engine tuning, professional engine building practices should be followed.