How many kilojoules are in 1 British thermal unit?

1 British thermal unit equals 1.05506 kJ.

How do I convert kilojoules back to British thermal units?

Use the reverse converter: 1 kilojoule equals 0.947817 BTU.

Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.

To convert British thermal units to kilojoules, multiply the value by 1.05505585.

kJ = BTU × 1.05505585

40 BTU × 1.05505585 = 42.2 kJ

British Thermal Unit (BTU): Used for heating, cooling and gas in the US. The IT BTU is about 1,055.056 joules.
Kilojoule (kJ): 1,000 joules; used for food energy in Australia, New Zealand and much of Europe.

How do I convert British thermal units to kilojoules?: To convert British thermal units to kilojoules, multiply the value by 1.05505585.
How many kilojoules are in 1 British thermal unit?: 1 British thermal unit equals 1.05506 kJ.
How many kilojoules are in 10 British thermal units?: 10 BTU equals 10.5506 kJ.
How do I convert kilojoules back to British thermal units?: Use the reverse converter: 1 kilojoule equals 0.947817 BTU.
Is this converter accurate?: Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.