British Thermal Unit to Joule
Convert BTU to J instantly — free, no sign-up.
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About the British Thermal Unit (BTU)
The British Thermal Unit is the energy needed to raise 1 pound of water by 1°F — still the standard unit for rating air conditioner and furnace capacity in the US.
About the Joule (J)
The Joule is the SI unit of energy, defined as the work done by one newton of force over one meter — a single joule is roughly the energy released dropping an apple one meter.
How to convert BTU to J
- Enter the value in BTU in the box above.
- The J equivalent updates instantly.
- Use the swap button to convert J back to BTU just as easily.