Unit Converters · Free tool
Energy Converter
Convert between joules, calories, kilocalories, kilowatt-hours, and BTUs. Free, instant.
Updated April 2026
Result
0.2390057361 Kilocalorie (kcal)
1 Kilojoule (kJ) = 0.2390057361 Kilocalorie (kcal)
All units
| Unit | Value |
|---|---|
| Joule (J) | 1,000 |
| Kilojoule (kJ) | 1 |
| Calorie (cal) | 239.0057361377 |
| Kilocalorie (kcal) | 0.2390057361 |
| Watt-hour (Wh) | 0.2777777778 |
| Kilowatt-hour (kWh) | 0.0002777778 |
| British thermal unit (BTU) | 0.9478133945 |
| Electronvolt (eV) | 6.241509e+21 |
| Foot-pound (ft·lb) | 737.5621211697 |
What it does
Convert joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTU, electronvolts, and foot-pounds. Useful in physics homework, food labels (kcal ↔ kJ), HVAC (BTU ↔ kWh), utility bills, and engineering. All conversions use SI exact relationships (1 cal = 4.184 J, 1 kWh = 3.6 MJ, 1 BTU = 1055.06 J).
For power see unit converter; for weight-related nutrition, calorie calculator.
How to use it
- Select source and target energy units.
- Enter the numeric value.
- Read the direct conversion plus the per-unit table.
- Swap source and target with the swap button.