kJ to J Converter
Convert kJ to J: 1 kJ = 1,000 J. Formula, worked example, table of common values and unit definitions.
Result2,500 J
1 kJ = 1,000 J
2.5 kJ =
2,500 J
Formula
J = kJ × 1,000 kJ = J × 0.001
Worked example
- 2.5 kJ × 1,000 = 2,500 J
Common values
| kJ | J |
|---|---|
| 0.1 | 100 |
| 0.5 | 500 |
| 1 | 1,000 |
| 2.5 | 2,500 |
| 10 | 10,000 |
| 100 | 100,000 |
Unit definitions
| Unit | Equals | What it is |
|---|---|---|
| kJ | 1,000 J | Kilojoule. |
| J | 1 J | Joule, the SI unit of energy: one watt-second. |
Frequently asked questions
How many J are in one kJ?
1 kJ = 1,000 J.
What is the formula to convert kJ to J?
J = kJ × 1,000. To go back, kJ = J × 0.001.
Is a kilojoule the same as a kilocalorie?
No. A kilocalorie (the food Calorie) is about 4.19 kJ. The two are both energy units, so the conversion is a fixed factor, but kJ and kcal are not interchangeable.
Related
Opposite direction: J to kJ
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