BTU to Kilojoules converter

To convert BTU to kilojoules, enter the value in the first field. The result in kilojoules is calculated automatically using the exact conversion factor.

1 BTU = 1.05505585262 kJ
1 kJ ≈ 0.947817120313 BTU

Formula: kJ = BTU × 1.05505585262
BTU ≈ kJ × 0.947817120313

Definitions: 1 BTU = 1055.05585262 J; 1 kJ = 1000 J

The British thermal unit (BTU) here is the International Table BTU, about 1,055 joules, roughly the energy needed to raise one pound of water by one degree Fahrenheit. It is used in the United States for heating and cooling equipment, fuel content and natural gas.

The kilojoule (kJ) is 1,000 joules. It is used for food energy on nutrition labels in Australia, New Zealand and Europe, often next to kcal, and for reaction energies in chemistry.

See the conversion table with commonly used values, handy for quick reference or study.