Formula
kJ to J conversion formula
Use this relationship for a direct conversion:
J = kJ x 1,000
Worked example
2 kJ = 2,000 J.
The thermochemical calorie and International Table BTU are named explicitly to avoid ambiguous legacy definitions.
Energy conversion
Convert Kilojoule to Joule
1 kilojoule (kJ) equals 1,000 joule (J). Enter any value below to convert from kJ to J.
Enter a value and choose units. Results update instantly.
1 kJ = 1,000 J
All Energy units
From 1 kJ| Unit | Value |
|---|---|
| Joule J | 1,000 |
| Kilojoule kJ | 1 |
| Thermochemical calorie cal | 239.0057361377 |
| Kilocalorie kcal | 0.2390057361 |
| Watt-hour Wh | 0.2777777778 |
| Kilowatt-hour kWh | 0.0002777778 |
| BTU (International Table) BTUₕᵀ | 0.9478171203 |
| Foot-pound ft·lb | 737.5621492773 |
| Electronvolt eV | 6.2415090745e21 |
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Quick reference
Kilojoule to Joule table
| Kilojoule (kJ) | Joule (J) |
|---|---|
| 0.01 | 10 |
| 0.1 | 100 |
| 1 | 1,000 |
| 2 | 2,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 1,000 | 1,000,000 |
From unit
About the kilojoule
One thousand joules.
Symbol: kJ
To unit
About the joule
The SI unit of energy, equal to one newton meter.
Symbol: J
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Related conversions
Source
Conversion standard
Definitions are checked against NIST SP 811: Energy units. Calculations use full internal precision before display rounding.
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kJ to J FAQ
How do you convert kilojoule to joule?
Use the formula J = kJ x 1,000. 1 kilojoule (kJ) equals 1,000 joule (J).
Is the kJ to J conversion exact?
Both unit definitions use exact factors. Only the displayed decimal may be rounded.