Joule to BTU Converter
Convert joules to BTU instantly with an energy calculator built for science, nutrition, HVAC, electricity, engineering, and everyday reference.
J to BTU Calculator
Enter an energy value and the conversion updates automatically.
Result updates automatically.
Formula: BTU = joules × 0.0009478171
How to Convert Joule to BTU
Energy conversion uses joules as the SI reference unit. Multiply the source energy by the factor shown below to convert it into the selected output unit.
1 joule
0.0009478171 BTU
10 joules
0.0094781712 BTU
100 joules
0.094781712 BTU
Energy Formula Notes
The calculator converts through joules as the base energy unit, then formats the result for the selected energy unit.
Joules to BTU Converter FAQ
Which energy units are supported?
This tool supports joules, kilojoules, BTU, small calories, kilocalories, watt-hours, kilowatt-hours, foot-pounds, and newton-meters.
How do I convert J to BTU?
Multiply the J value by 0.0009478171 to get BTU. The calculator performs the formula automatically.
Can I reverse the energy conversion?
Yes. Use the swap button to reverse the selected units and calculate the opposite direction.