How to Convert Fuel Efficiency

The Fuel Efficiency Converter calculates the equivalent fuel efficiency between thermochemical British thermal unit per pound (Btu(th)/lb) and joule per kilogram (J/kg) using the following conversion factors:

From Btu(th)/lb to J/kg:

From J/kg to Btu(th)/lb:

Where:

• \( \text{Btu(th)/lb} \): Thermochemical British thermal unit per pound, a unit of fuel efficiency by mass, used in energy calculations, particularly in the US and UK.
• \( \text{J/kg} \): Joule per kilogram, a metric unit used in scientific and engineering applications to measure energy per unit mass.

Enter the fuel efficiency value and select the unit to convert between Btu(th)/lb and J/kg.

Using the Fuel Efficiency Converter

This converter is designed to assist with converting fuel efficiency between Btu(th)/lb and J/kg, useful in fields like thermodynamics, energy engineering, and HVAC systems.

Input the fuel efficiency value and select the unit (Btu(th)/lb or J/kg). The calculator will display the converted values in both units.

Example: Convert 5 Btu(th)/lb to J/kg.

1. Fuel Efficiency: \( 5 \, \text{Btu(th)/lb} \)
2. Conversion: \( 5 \times 2324.4444444446 = 11622.222222223 \, \text{J/kg} \)
3. Result: \( 5 \, \text{Btu(th)/lb} = 11622.222222223 \, \text{J/kg} \)

Use this tool for quick and accurate conversions in scientific and engineering applications.

Common Conversion Table

The following table provides quick reference conversions for common fuel efficiency values between Btu(th)/lb and J/kg:

Btu(th)/lb	J/kg
1	2324.4444
2	4648.8889
5	11622.2222
10	23244.4444
20	46488.8889

Use this table for quick lookups or to verify calculator results.

Common FAQ

Below are frequently asked questions about fuel efficiency conversions between Btu(th)/lb and J/kg:

• Q: What is the difference between Btu(th)/lb and J/kg?
  A: Btu(th)/lb (thermochemical British thermal unit per pound) measures energy per pound, while J/kg (joule per kilogram) measures energy per kilogram. 1 Btu(th)/lb equals 2324.4444444446 J/kg due to unit scaling (1 lb ≈ 0.453592 kg).
• Q: Why convert between Btu(th)/lb and J/kg?
  A: Conversions are needed in industries like HVAC and energy engineering, where Btu(th)/lb is used in the US/UK, and J/kg is standard in metric systems globally.
• Q: How accurate is this converter?
  A: The converter uses the precise conversion factor (1 Btu(th)/lb = 2324.4444444446 J/kg) and provides results rounded to 6 decimal places for Btu(th)/lb and 5 for J/kg, ensuring high accuracy.
• Q: Can negative values be converted?
  A: Yes, the converter handles negative values, which may be relevant in specific scientific contexts, and performs conversions accurately.
• Q: How does Btu(th)/lb differ from Btu(IT)/lb?
  A: Btu(th) (thermochemical) is slightly different from Btu(IT) (International Table). 1 Btu(th)/lb = 2324.4444444446 J/kg, while 1 Btu(IT)/lb = 2326 J/kg, due to different Btu definitions.