About the BTU Converter
Convert british thermal units (BTU) to kilojoules (kJ) instantly. Includes the exact conversion factor, formula and a quick reference table.
Also known as: BTU to kJ, British thermal units to Kilojoules, convert British thermal units to Kilojoules, btu to kj, btu to kwh, british thermal unit converter.
How to use this calculator
- Enter value in british thermal units.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Open “Step-by-step” to see how the answer was worked out.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
kJ = BTU × 1.0550558526
Worked example
Using the values pre-filled in the calculator above:
- Value in british thermal units = 1,000 BTU
the calculator returns:
- Kilojoules: 1,055.055853 kJ
- Joules: 1,055,055.85 J
- Megajoules: 1.0551 MJ
- Calories: 252,164.4 cal
Working
1,000 BTU × 1.0550558526 = 1,055.05585262 kJ