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Kilojoules to BTU
Convert kilojoules (kJ) to BTU (BTU). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 kJ = 0.947813 BTU
Kilojoules to BTU Conversion Table
Common values, ready to copy:
| kilojoules | BTU |
|---|---|
| 1 kJ | 0.947813 BTU |
| 2 kJ | 1.8956 BTU |
| 5 kJ | 4.7391 BTU |
| 10 kJ | 9.4781 BTU |
| 25 kJ | 23.6953 BTU |
| 50 kJ | 47.3907 BTU |
| 100 kJ | 94.7813 BTU |
| 1,000 kJ | 947.81 BTU |
Formula
BTU = kilojoules × 9.47813394e-1
Energy uses the SI joule. Food calories (kcal) are 1,000 small calories: 1 kcal = 4,184 J. 1 kWh = 3.6 MJ = 3,600,000 J. 1 BTU = 1,055.06 J.
About Kilojoules and BTU
Kilojoules (kJ): A thousand joules; the practical SI energy unit for food and nutrition in metric countries. Common uses: Food energy labeling outside the US, electrical energy in kJ for small batteries, and biology (metabolism).
BTU (BTU): British Thermal Unit; the energy to raise one pound of water by one degree Fahrenheit; defined as exactly 1,055.06 J. Common uses: US heating and air conditioning (a 24,000 BTU air conditioner cools roughly a 1,500 sq ft room), and US natural gas billing.
How the conversion works
Energy uses the SI joule. Food calories (kcal) are 1,000 small calories: 1 kcal = 4,184 J. 1 kWh = 3.6 MJ = 3,600,000 J. 1 BTU = 1,055.06 J.
The exact relationship is BTU = kilojoules × 9.47813394e-1, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between kilojoules and BTU comes up wherever energy measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.