This **cfm to kw conversion calculator** is created to convert **Cubic Feet per Minute (CFM)** to **Kilowatts (kW)**.

CFM measures the

volumetric flow rateof air, while kW quantifieselectrical power. The relationship between these units is not straightforward, as it depends on several factors, including air pressure and temperature.

Consider a large industrial fan moving **10,000 CFM** of air. To determine the electrical power required to operate this fan, you’d need to **convert CFM to kW**. This is where the **CFM to kW calculator** comes in handy, taking into account the specific system parameters to provide an accurate conversion.

## CFM to kW Calculator

CFM | Pressure (psi) | Efficiency | kW (calculated) |
---|---|---|---|

100 | 100 | 0.80 | 40.6 |

200 | 100 | 0.80 | 81.2 |

300 | 100 | 0.80 | 121.8 |

400 | 100 | 0.80 | 162.4 |

500 | 100 | 0.80 | 203.0 |

600 | 100 | 0.80 | 243.6 |

700 | 100 | 0.80 | 284.2 |

800 | 100 | 0.80 | 324.8 |

900 | 100 | 0.80 | 365.4 |

1000 | 100 | 0.80 | 406.0 |

100 | 125 | 0.85 | 47.1 |

200 | 125 | 0.85 | 94.2 |

300 | 125 | 0.85 | 141.3 |

400 | 125 | 0.85 | 188.4 |

500 | 125 | 0.85 | 235.5 |

600 | 125 | 0.85 | 282.6 |

700 | 125 | 0.85 | 329.7 |

800 | 125 | 0.85 | 376.8 |

900 | 125 | 0.85 | 423.9 |

1000 | 125 | 0.85 | 471.0 |

100 | 150 | 0.90 | 52.4 |

200 | 150 | 0.90 | 104.8 |

300 | 150 | 0.90 | 157.2 |

400 | 150 | 0.90 | 209.6 |

500 | 150 | 0.90 | 262.0 |

600 | 150 | 0.90 | 314.4 |

700 | 150 | 0.90 | 366.8 |

800 | 150 | 0.90 | 419.2 |

900 | 150 | 0.90 | 471.6 |

1000 | 150 | 0.90 | 524.0 |

## CFM to kW Conversion Formula

**kW = (CFM × Pressure (psi) × 0.746) / (229 × Efficiency)**

Where:

- CFM is the air flow rate
- Pressure is in pounds per square inch (psi)
- 0.746 is the conversion factor from horsepower to kilowatts
- 229 is a constant derived from thermodynamic principles
- Efficiency is the overall system efficiency (typically 0.7 to 0.9)

**Let’s convert 500 CFM at 100 psi with 80% efficiency:**

**kW = (500 × 100 × 0.746) / (229 × 0.8) ≈ 203.3**

500 CFM of air at 100 psi with 80% efficiency requires approximately 203.3 kW of power.

### How do I convert CFM to kW?

To convert CFM to kW, follow these steps:

**Determine the air flow rate**in CFM**Measure the air pressure**in psi**Estimate the system efficiency****Apply the conversion formula****Calculate the result**

Suppose you have an air compressor with the following specifications:

- Air flow rate: 750 CFM
- Pressure: 125 psi
- System efficiency: 85%

Step 1: Air flow rate is given as 750 CFM

Step 2: Pressure is 125 psi

Step 3: Efficiency is 0.85 (85%)

Step 4: Apply the formula

kW = (750 × 125 × 0.746) / (229 × 0.85)

Step 5: Calculate

kW ≈ 452.5

**The 750 CFM air compressor operating at 125 psi with 85% efficiency requires approximately 452.5 kW of power.**

### How many CFM per kW?

To find CFM per kW, we rearrange the conversion formula:

**CFM/kW = (229 × Efficiency) / (Pressure (psi) × 0.746)**

**Let’s calculate CFM per kW for a system operating at 90 psi with 75% efficiency:**

`CFM/kW = (229 × 0.75) / (90 × 0.746) ≈ 2.57`

This means that under these conditions, you get approximately

2.57 CFMfor every kW of power input.

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