Kilojoule to British Thermal Unit
Convert kJ to BTU instantly — free, no sign-up.
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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.
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.
How to convert kJ to BTU
- Enter the value in kJ in the box above.
- The BTU equivalent updates instantly.
- Use the swap button to convert BTU back to kJ just as easily.