How many Kilojoule are in 1 British Thermal Unit?

One british thermal unit equals 1.05506 kilojoule.

Can I convert Kilojoule back to British Thermal Unit?

Yes. Enter a value in either field to convert from British Thermal Unit (BTU) to Kilojoule (kJ) or the reverse — results update instantly.

British Thermal Unit to Kilojoule Converter

BTU → kJ

Convert between joules, calories, BTU, kWh, and more energy units. Perfect for physics, nutrition, and electricity calculations.

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How to Convert British Thermal Unit to Kilojoule

Enter a value above, select your units, and get instant results. Works both ways — British Thermal Unit to Kilojoule or Kilojoule to British Thermal Unit.

Formula: Kilojoule = British Thermal Unit × 1.05506

Quick steps

Enter the value you want to convert in the "British Thermal Unit" field.
Select "British Thermal Unit" as your "From" unit.
Select "Kilojoule" as your "To" unit.
The converted result appears instantly in the "Kilojoule" field.
To reverse the conversion, enter a value in the "Kilojoule" field instead.

Common British Thermal Unit to Kilojoule Conversions

British Thermal Unit	Kilojoule
1	1.05506
5	5.2753
10	10.5506
25	26.3765
50	52.753
100	105.506

Frequently Asked Questions

Multiply your british thermal unit value by 1.05506. For example, 10 BTU = 10.5506 kJ.

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Convert British Thermal Unit to Kilojoule