Unit Converters · Browser · Free

BTU to Joules Converter

Type an amount of energy in BTU and read the same energy in joules. One BTU (IT) equals 1055.05585262 J.

Two units for the same quantity

The British Thermal Unit and the joule both measure energy, so a value quoted in BTU can be restated in joules without changing the quantity itself. Only the unit label changes.

This converter works with the International Table form of the unit, the version defined as exactly 1055.05585262 joules.

BTU to joules formula

One BTU (IT) equals 1055.05585262 joules, so the conversion is a single multiplication: E(J) = 1055.05585262 * E(BTU).

For example, 5 BTU gives 1055.05585262 * 5, about 5275.279263 J, the same figure listed in the table below. To work backwards, divide the number of joules by 1055.05585262 to get BTU.

Using the converter

Enter the energy in BTU in the input box and press Convert; the joule value appears in the result line next to J.

Copy puts that result on your clipboard, and Clear empties the box so you can run the next conversion.