Convert energy between SI, electrical, food, thermal, and mechanical units.
Result
1 kJ = 0.2390057361 kcal
1 kJ in every supported unit.
| Unit | Value |
|---|---|
| JouleJ | 1,000 |
| KilojoulekJ | 1 |
| Caloriecal | 239.0057361377 |
| Kilocaloriekcal | 0.2390057361 |
| Watt-hourWh | 0.2777777778 |
| Kilowatt-hourkWh | 0.0002777778 |
| British thermal unitBTU | 0.9478171203 |
| Foot-poundft⋅lb | 737.5621492773 |
Complete tool guide
The Energy Converter is a free online conversion tool for translating a energy value from one measurement unit into another. Convert energy between SI, electrical, food, thermal, and mechanical units. Enter a number once to see the selected result and a comparison table covering every supported unit.
Unit conversion is useful whenever a specification, recipe, report, product label, instrument, dataset, or instruction uses a measurement system different from the one you need. The converter applies the defined mathematical relationship consistently and avoids the common mistakes caused by moving decimal points or relying on a remembered approximate factor.
Enter the source number exactly as supplied, including any required decimal precision.
Choose the original unit in the From field and verify its symbol; similarly named units can represent different quantities.
Choose the required destination unit in the To field and read the live result. Use Swap when you need the reverse relationship.
Review the all-conversions table, then copy the labeled result and retain the source value for traceability.
Energy is normalized through joules. The supported factors connect SI energy, food calories, watt-hours, British thermal units, and foot-pounds.
Energy values are normalized through joules.
This converter supports Joule (J), Kilojoule (kJ), Calorie (cal), Kilocalorie (kcal), Watt-hour (Wh), Kilowatt-hour (kWh), British thermal unit (BTU), Foot-pound (ft⋅lb).
The output represents an equivalent amount of energy, not power. A kilowatt-hour measures energy consumed over time, while a kilowatt measures a rate.
The food “Calorie” is a kilocalorie. Energy, power, torque, and force are different physical quantities even when their unit names appear in related calculations.
Displayed values are rounded for readability. A converted number cannot be more accurate than the source measurement, so do not treat extra decimal places as additional instrument precision.
Convert energy between SI, electrical, food, thermal, and mechanical units. Supported choices are Joule (J), Kilojoule (kJ), Calorie (cal), Kilocalorie (kcal), Watt-hour (Wh), Kilowatt-hour (kWh), British thermal unit (BTU), Foot-pound (ft⋅lb). Select the unit attached to the source value and the unit required for the result.
The calculator uses the factors and formulas described above and retains precision internally. The practical accuracy still depends on the source measurement, correct unit selection, displayed rounding, and whether the context uses the same unit definition.
Check for a rounded factor, a different regional unit, an incorrect source unit, or a distinction such as decimal versus binary, US versus imperial, gauge versus absolute, or mass versus volume. Compare the complete unit name and method.
Only some metric-prefix conversions work that way. Imperial relationships, offset temperature scales, reciprocal fuel economy, area, volume, and many cross-system conversions require specific formulas. Use the defined converter rather than assuming a power of ten.
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