1 kilojoule (kJ) = 1,000 joules (J). To convert, multiply by 1,000: J = kJ × 1,000. For example, 5 kJ = 5,000 J.
J = kJ × 1,000
Kilojoules to joules table
| Kilojoules (kJ) | Joules (J) |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 4 | 4,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 250 | 250,000 |
| 500 | 500,000 |
| 1,000 | 1,000,000 |
The two units
Kilojoule (kJ). One thousand joules; food labels outside the US often give energy in kJ.
Joule (J). The SI unit of energy: one newton acting over one meter.
Because both units are defined in terms of the same base unit, the factor 1,000 is exact, not a rounded measurement.
Convert kilojoules to other units
- Kilojoules to calories — 1 kJ = 239.0057361 cal
- Kilojoules to kilocalories — 1 kJ = 0.2390057361 kcal
- Kilojoules to watt-hours — 1 kJ = 0.2777777778 Wh
- Kilojoules to kilowatt-hours — 1 kJ = 0.0002777778 kWh
- Kilojoules to British thermal units — 1 kJ = 0.9478171203 BTU
- Kilojoules to electronvolts — 1 kJ = 6.241509e+21 eV
Convert other units to joules
Questions people ask
- How many joules are in a kilojoule?
- 1,000, exactly.
- How do you convert kilojoules to joules?
- J = kJ × 1,000. It is the same as dividing by 0.001.
- How do you convert joules back to kilojoules?
- kJ = J ÷ 1,000. See joules to kilojoules.
Results use the legal definitions of each unit and are checked against the Pint unit library. Display rounds to 10 significant digits. All unit conversions · More tools
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