Convert BTU to kJ

Conversion Calculator

Enter your value in the conversion calculator below.

TIP: If the result of your conversion is 0, try increasing the "Decimals".

How to convert BTU to kJ: Enter a value in the BTU field and click on the "Calculate kJ" button. Your answer will appear in the kJ field.

Conversion Definitions

The following is a list of definitions relating to conversions between BTU and kilojoules.

What is a British Thermal Unit (BTU)?

A British Thermal Unit is a unit of energy in the Imperial System. The symbol for British Thermal Unit is BTU or Btu. There are 0.94781712 BTU in a kilojoule. A BTU is measured as the quantity of heat required to raise the temperature of 1 pound of water by 1°F.

What is a kilojoule (kJ)?

A kilojoule is a unit of energy in the International System of Units (SI). The symbol for kilojoule is kJ. There are 1.05505585262 kilojoules in a BTU.

Conversion Formula

Let's take a closer look at the conversion formula so that you can do these conversions yourself with a calculator or with an old-fashioned pencil and paper.

The formula to convert from BTU to kJ is:

kJ = BTU x 1.05505585262

Conversion Example

Next, let's look at an example showing the work and calculations that are involved in converting from British Thermal Units to kilojoules (BTU to kJ).

BTU to Kilojoule Conversion Example

Task: Convert 4 BTUs to kilojoules (show work)

Formula:
BTU x 1.05505585262 = kJ

Calculations:
4 BTU x 1.05505585262 = 4.22022341 kJ

Result:
4 BTU is equal to 4.22022341 kJ

Conversion Table

For quick reference purposes, below is a conversion table that you can use to convert from BTUs to kilojoules.

BTUs to Kilojoules Conversion Chart

British Thermal Units (BTU)	kilojoules (kJ)
1 BTU	1.05505585 kJ
2 BTU	2.11011171 kJ
3 BTU	3.16516756 kJ
4 BTU	4.22022341 kJ
5 BTU	5.27527926 kJ
6 BTU	6.33033512 kJ
7 BTU	7.38539097 kJ
8 BTU	8.44044682 kJ
9 BTU	9.49550267 kJ
10 BTU	10.55055853 kJ
20 BTU	21.10111705 kJ
30 BTU	31.65167558 kJ
40 BTU	42.2022341 kJ
50 BTU	52.75279263 kJ
75 BTU	79.12918895 kJ
100 BTU	105.50558526 kJ
250 BTU	263.76396316 kJ
500 BTU	527.52792631 kJ
750 BTU	791.29188947 kJ
1,000 BTU	1,055.05585262 kJ
2,500 BTU	2,637.63963155 kJ
5,000 BTU	5,275.2792631 kJ
7,500 BTU	7,912.91889465 kJ
10,000 BTU	10,550.5585262 kJ
25,000 BTU	26,376.3963155 kJ
50,000 BTU	52,752.792631 kJ
75,000 BTU	79,129.1889465 kJ
100,000 BTU	105,505.585262 kJ
250,000 BTU	263,763.963155 kJ

Related Units

This table provides a summary of the Energy units within their respective measurement systems.

Unit	Symbol	Measurement System	Description
calories (thermochemical)	cal	International System of Units (SI)	1 cal = 4.184 J
kilocalories	kcal	International System of Units (SI)	1,000 cal = 1 kcal
British Thermal Unit	BTU or Btu	Imperial System	1 BTU = 1,055 J
joules	J	International System of Units (SI)	base unit
kilojoules	kJ	International System of Units (SI)	1,000 J = 1 kJ
megajoules	MJ	International System of Units (SI)	1,000,000 J = 1 MJ
gigajoules	GJ	International System of Units (SI)	1,000,000,000 J = 1 GJ
terajoules	TJ	International System of Units (SI)	1,000,000,000,000 J = 1 TJ

Find a Conversion

Looking for a conversion? Select a conversion type and the desired units.