A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States.
Kilojoules to Btu
Convert Kilojoule (kJ) to British thermal unit (BTU) instantly with an exact formula, conversion table, and FAQ.
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Convert kilojoules (kJ) to btu (BTU) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
The British thermal unit (BTU) is the energy needed to raise one pound of water by one degree Fahrenheit, widely used for heating and air-conditioning ratings.
BTU = kJ × 0.9478171203
Results update instantly for Kilojoules to Btu conversions.
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Formula
BTU = kJ × 0.9478171203
kJ = BTU × 1.055055853
Conversion table
| 1 kJ | 0.947817 BTU |
| 5 kJ | 4.739086 BTU |
| 10 kJ | 9.478171 BTU |
| 20 kJ | 18.956342 BTU |
| 50 kJ | 47.390856 BTU |
| 100 kJ | 94.781712 BTU |
| 500 kJ | 473.908560 BTU |
| 1000 kJ | 947.817120 BTU |
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How the formula works
Both kilojoule and british thermal unit measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in kilojoules by 0.9478171203 to get btu. To reverse the conversion, multiply a british thermal unit value by 1.055055853 to get back to kilojoules.
Frequently asked questions
What is Kilojoule (kJ)?
A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States.
What is British thermal unit (BTU)?
The British thermal unit (BTU) is the energy needed to raise one pound of water by one degree Fahrenheit, widely used for heating and air-conditioning ratings.
How do I convert kilojoules to btu?
Multiply the kilojoule value by 0.9478171203 to get the equivalent in btu. For example, 5 kJ × 0.9478171203 = 4.739086 BTU.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.9478171203 is an exact, non-rounded value.
Can I convert btu back to kilojoules?
Yes. Divide the british thermal unit value by 0.9478171203, or multiply it by 1.055055853, to get kilojoules.
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About converting kilojoules to btu
A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States. The British thermal unit (BTU) is the energy needed to raise one pound of water by one degree Fahrenheit, widely used for heating and air-conditioning ratings.
Use this calculator to move between kilojoules and btu accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.