Convert thermochemical BTU to joules

Explanation

From this page you can convert thermochemical BTU to joules (or BTU_th to J) simply, by using the application above.

In case you are wondering, to convert from thermochemical BTU to joules you need to multiply by 1054.3503. This factor is calculated using the respective definitions of the two units you can find below.

Formula

1 BTU_th≈1054.3503 J

thermochemical BTUBTU_th

dimension	energy
symbol	BTU_th

The thermochemical BTU (BTU_th) is a unit of energy.

Definition of the thermochemical BTU

The BTU is the amount of energy needed to raise the temperature of one pound of water by one degree Fahrenheit on average from the freezing and boiling point of water.

Value

Since the thermochemical BTU is based on the thermochemical calorie and the definition of the calorie follows the same logic as the BTU but for one gram of water and one degree Celsius, it is simply a matter of converting these units.

Given that one thermochemical calorie is equal to 4.184 joules, there are 453.59237 grams in a pound and a difference of one °C is a difference of 5/9 °F, then one BTU is equal to: 4.184 × 453.59237 × 5/9 joules.

Equivalences

One thermochemical BTU is equivalent to:

Other BTUs

thermochemical BTU	BTU_th
International BTU	BTU_IT
BTU (mean)	BTU
BTU 39 °F	BTU
BTU 59 °F	BTU
BTU 60 °F	BTU

Multiple BTU units

All BTU units share the same base definition, that it is the amount of energy needed to raise the temperature of one pounds of water by one degree Fahrenheit. But they all differ on variables like the starting temperature of the water and the pressure.

To make things worse, most documents do not specify which BTU they are using. I therefore have to recommend you to be carefull if you require a precise result.

joulesJ

dimension	energy
system	International system of units (SI)
symbol	J

The joule (J) is the base unit of energy in the International System of Units.

Definition of the joule

Le joule est le travail produit par un newton dont le point d'application se déplace de un mètre dans la direction de la force.

9^th CGPM (1948) p. 113

That is to say, one joule is the work done by a force of one newton whose point of application moves one meter in the direction of the force.

SI Energy Units

picojoule	pJ	0.000 000 000 001
nanojoule	nJ	0.000 000 001
microjoule	µJ	0.000 001
millijoule	mJ	0.001
joule	J	1
kilojoule	kJ	1000
megajoule	MJ	1 000 000
gigajoule	GJ	1 000 000 000
terajoule	TJ	1 000 000 000 000