BTU to Joules Converter
Convert BTU to joules and back. Enter British thermal units and read the energy in joules, kilojoules, or kilowatt-hours.
Calculator by Toolsloft ↗- Result
- 1055.055853 Joules (J)
- Conversion
- 1 British thermal units (BTU) = 1055.055853 Joules (J)
Convert BTU to joules, the conversion that comes up with furnace, air conditioner, and appliance ratings that are quoted in British thermal units but need to be in SI joules. Enter the BTU value and read the energy in joules, and swap to convert joules back to BTU.
How this is calculated
This uses the International Table BTU, defined as 1055.05585262 joules exactly, the value used across HVAC and engineering references. The tool multiplies BTU by 1055.05585262 to get joules and divides for the reverse.
How to use
- Enter the energy in BTU.
- Keep BTU to joules, or press Swap for the reverse.
- Read the result in joules.
Examples
- One BTU:
1 BTU = 1,055.06 J - Furnace output:
10000 BTU = 10,550,558.53 J
FAQ
- How many joules are in one BTU?
- One International Table BTU is 1055.05585262 joules. Rounded, that is about 1055 joules.
- Which BTU definition does this use?
- The International Table BTU, the standard used in HVAC and most engineering work. Other definitions differ by a fraction of a percent.