Unit Converters · Browser · Free

BTU to Kilojoules Conversion

This tool changes an energy amount given in BTU into its kilojoule (kJ) equivalent. Type a value, press Convert, and read the result right away.

About this converter

Both BTU and the kilojoule are units of energy, so this page answers a simple question: how many kilojoules does a given number of BTU come to? It works from the International Table definition of the BTU, where 1 BTU (IT) is defined as exactly 1055.05585262 J, that is exactly 1.05505585262 kJ.

Enter your amount in the input, press the Convert button, and the matching energy in kilojoules appears on screen. You can then copy the result or clear the field and try another number.

BTU to kilojoules formula

To convert yourself, multiply the energy in BTU by the factor 1.05505585262: E(kJ) = 1.05505585262 × E(BTU).

For example, 0.5 BTU means 0.5 × 1.05505585262, which gives 0.52752792631 kJ, about 0.527528 kJ.

Reading the conversion table

The table below pairs common BTU amounts with their kilojoule equivalents, from 1 BTU (1.05505585262 kJ) up to 10,000 BTU (10550.5585262 kJ). For an amount that is not listed, multiply it by 1.05505585262 or compare it with the nearest rows.