How to convert british thermal units to kilojoules
To convert a measurement in british thermal units to kilojoules, multiply the value by 1.055056. The conversion factor comes from the relationship between both units and the joule.
For example, to convert 5 BTU to kilojoules: 5 × 1.055056 = 5.275279 kJ.
What is a british thermal unit?
A British thermal unit (BTU) is the energy needed to raise the temperature of one pound of water by one degree Fahrenheit, about 1,055 joules. The BTU arose from imperial heating and steam engineering. It remains the dominant unit for heating, ventilation, and air-conditioning capacity in the United States, where furnaces and air conditioners are rated in BTU.
Common uses of british thermal units include: Air conditioner and furnace ratings; Heating and cooling load calculations; Natural gas and fuel energy content; HVAC system sizing in the US.
What is a kilojoule?
A kilojoule equals 1,000 joules and is the standard metric unit for expressing food energy on nutrition labels in most of the world. As metric countries adopted SI units for food labeling, the kilojoule replaced the food calorie on packaging in regions such as Australia, New Zealand, and the European Union (shown alongside kcal).
Common uses of kilojoules include: Food energy on nutrition labels; Dietary and exercise energy tracking; Chemical reaction energy (enthalpy); Battery and mechanical energy specs.
British Thermal Units to kilojoules worked examples
Here are some common values converted:
1 BTU = 1.055056 kJ 5 BTU = 5.275279 kJ 10 BTU = 10.550559 kJ 50 BTU = 52.752793 kJ 100 BTU = 105.505585 kJ
Frequently asked questions
How many kilojoules are in one british thermal unit?
One british thermal unit (BTU) equals 1.055056 kilojoules (kJ). Multiply any value in british thermal units by 1.055056 to convert to kilojoules.
How do I convert british thermal units to kilojoules?
Multiply the value in british thermal units by 1.055056. For example, 5 BTU × 1.055056 = 5.275279 kJ.
How do I convert kilojoules to british thermal units?
Multiply the value in kilojoules by 0.947817120313, or divide by 1.055056. Use the swap button on the converter above to reverse the direction.
Is the british thermal unit to kilojoule conversion exact?
The thermochemical calorie is defined as exactly 4.184 J and the BTU as 1055.056 J. Conversions between SI energy units are exact.
What is the formula for british thermal units to kilojoules?
The formula is: kJ = BTU × 1.055056. This comes from the definition of both units relative to the joule.