How it works
Convert work and heat energy. The calorie is the thermochemical calorie of exactly 4.184 joules, and kWh is energy rather than power.
result = value × source factor / destination factor
Worked example
Show example inputs and result
Value: 100 · From unit: J · To unit: kJ.
- Converted value
- 0.1 kJ
Questions and answers
Which unit convention is used?
Convert work and heat energy. The calorie is the thermochemical calorie of exactly 4.184 joules, and kWh is energy rather than power.
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.
Conversion reference: NIST SI Guide
Method reviewed: October 8, 2026 · Methods & accuracy