Enter a value in one field (Joules, kcal or kWh), then click "Convert energy". The tool will automatically fill in the other units using standard physics conversions:
- 1 kcal = 4,184 joules
- 1 kWh = 3,600,000 joules
This energy converter helps you quickly convert between Joules (J), kilocalories (kcal) and kilowatt-hours (kWh), three of the most commonly used energy units in physics, nutrition and electricity billing. Whether you need to convert food calories into joules, joules into kWh, or understand how energy consumption relates to electricity usage, this calculator provides instant and accurate results using standard scientific formulas.
All conversions are performed locally in your browser, with no data sent to any server. This makes the tool fast, private and reliable for students, engineers, athletes, nutrition tracking or anyone needing a simple energy unit converter.