Joule to British Thermal Unit
Convert J to BTU instantly — free, no sign-up.
—
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.
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.
How to convert J to BTU
- Enter the value in J in the box above.
- The BTU equivalent updates instantly.
- Use the swap button to convert BTU back to J just as easily.