AbraCalc

1 BTU to kJ

1 British Thermal Unit equals approximately 1.055 kilojoules.

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How to use this tool

  1. Enter energy and from unit in the fields above.
  2. Results update instantly as you type — or click Calculate.
  3. Read your kilojoules and the full breakdown beneath it.

Convert 1 BTU to kilojoules — used for comparing HVAC and heating system ratings.