### Energy Equivalency Calculation

Using fuel energy equivalents provides the user with a comparison tool for gauging various fuels against a known constant that has relative meaning. A common method of measurement is the Gasoline Gallon Equivalent. **The chart at the bottom of this page** arrives at the equivalent measurement by comparing the BTU content per unit of each fuel type and then calculating the ratio.

### What’s a BTU?

As a basis for determining energy content of a fuel, it is helpful to understand exactly what a BTU (British Thermal Unit) is. Its scientific definition goes something like this: *British Thermal Unit - The amount of heat (energy) required to raise the temperature of 1 pound of water by 1 degree Fahrenheit.*

Think of it this way: it's basically a standard. Just as PSI (pounds per square inch) is a standard for measuring pressure, so too is a BTU a standard for measuring energy content.

**See GGE conversion chart below**

Gasoline Gallon Equivalents | |||

Fuel Type | Unit of Measure | BTUs/Unit | Gallon Equivalent |

Gasoline (regular) | gallon | 114,100 | 1.00 gallon |

Diesel #2 | gallon | 129,500 | 0.88 gallons |

Biodiesel (B100) | gallon | 118,300 | 0.96 gallons |

Biodiesel (B20) | gallon | 127,250 | 0.90 gallons |

Compressed Natural Gas (CNG) | cubic foot | 900 | 126.67 cu. ft. |

Liquid Natural Gas (LNG) | gallon | 75,000 | 1.52 gallons |

Propane (LPG) | gallon | 84,300 | 1.35 gallons |

Ethanol (E100) | gallon | 76,100 | 1.50 gallons |

Ethanol (E85) | gallon | 81,800 | 1.39 gallons |

Methanol (M100) | gallon | 56,800 | 2.01 gallons |

Methanol (M85) | gallon | 65,400 | 1.74 gallons |

Electricity | kilowatt hour (Kwh) | 3,400 | 33.56 Kwhs |

**Learn all About Alternative Fuels with The Ultimate Alt Fuel Primer.**