Energy Converter
Your entries are calculated in this browser and are not saved by this tool.
How the Energy Converter works
Convert joules, watt-hours, kilowatt-hours, calories and BTU. Enter the requested values in the tool above, select Calculate, and review both the main result and its breakdown.
Formula used
All values convert through joules, clearly distinguishing a small calorie from a food kilocalorie.
Worked example
1 kilowatt-hour equals 3.6 million joules.
Practical uses
- Convert a measurement
- Check a specification
- Compare international units
Assumptions and limits
Results depend on the supplied values and displayed rounding. For reproducibility, record the inputs and assumptions used when sharing a result.
Frequently asked questions
Is this calculator free?
Yes. It can be used without creating an account.
Are the values I enter stored?
The calculation runs in your browser. The core tool does not submit your calculator entries to WordPress.
Can I rely on the result for a major decision?
Use it as an educational estimate, verify important inputs, and seek qualified advice when the decision carries financial, medical, tax or legal consequences.