British Thermal Unit to Kilojoule
Convert BTU to kJ instantly — free, no sign-up.
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About the British Thermal Unit (BTU)
The British Thermal Unit is the energy needed to raise 1 pound of water by 1°F — still the standard unit for rating air conditioner and furnace capacity in the US.
About the Kilojoule (kJ)
The Kilojoule is equal to 1,000 joules, the unit used on nutrition labels in most countries outside the US alongside (or instead of) Calories.
How to convert BTU to kJ
- Enter the value in BTU in the box above.
- The kJ equivalent updates instantly.
- Use the swap button to convert kJ back to BTU just as easily.