1 joule (J) = 0.001 kilojoules (kJ). To convert, divide by 1,000: kJ = J ÷ 1,000. For example, 500 J = 0.5 kJ.
kJ = J ÷ 1,000
Joules to kilojoules table
| Joules (J) | Kilojoules (kJ) |
|---|---|
| 100 | 0.1 |
| 200 | 0.2 |
| 300 | 0.3 |
| 400 | 0.4 |
| 500 | 0.5 |
| 1,000 | 1 |
| 2,000 | 2 |
| 2,500 | 2.5 |
| 5,000 | 5 |
| 10,000 | 10 |
| 25,000 | 25 |
| 50,000 | 50 |
| 100,000 | 100 |
The two units
Joule (J). The SI unit of energy: one newton acting over one meter.
Kilojoule (kJ). One thousand joules; food labels outside the US often give energy in kJ.
Because both units are defined in terms of the same base unit, the factor 0.001 is exact, not a rounded measurement.
Convert joules to other units
- Joules to calories — 1 J = 0.2390057361 cal
- Joules to kilocalories — 1 J = 0.0002390057 kcal
- Joules to watt-hours — 1 J = 0.0002777778 Wh
- Joules to kilowatt-hours — 1 J = 2.777778e-7 kWh
- Joules to British thermal units — 1 J = 0.0009478171 BTU
- Joules to electronvolts — 1 J = 6.241509e+18 eV
Convert other units to kilojoules
Questions people ask
- How many kilojoules are in a joule?
- 0.001, exactly.
- How do you convert joules to kilojoules?
- kJ = J ÷ 1,000. It is the same as dividing by 1,000.
- How do you convert kilojoules back to joules?
- J = kJ × 1,000. See kilojoules to joules.
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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