Kilojoules to Joules Converter
Convert kilojoules (kJ) to joules (J) instantly. Energy conversions link food labels in kJ and kcal, SP Group bills in kWh and air-conditioner capacity in BTU.
Result
- Joules
- 1,000 J
How to use the kilojoules to joules converter
- Enter the kilojoules (kJ).
- The results update as you type, or press Calculate.
- Read the joules first, then the supporting figures below it.
Formula
Joules = kilojoules × 1,000
Worked example
For example, with these inputs:
- Kilojoules (kJ): 1
the calculator returns:
- Joules: 1,000 J
Kilojoules to Joules table
| Kilojoules | Joules |
|---|---|
| 1 kJ | 1,000 J |
| 2 kJ | 2,000 J |
| 5 kJ | 5,000 J |
| 10 kJ | 10,000 J |
| 20 kJ | 20,000 J |
| 25 kJ | 25,000 J |
| 50 kJ | 50,000 J |
| 100 kJ | 100,000 J |
| 250 kJ | 250,000 J |
| 500 kJ | 500,000 J |
| 1,000 kJ | 1,000,000 J |
About this conversion
Energy conversions link food labels in kJ and kcal, SP Group bills in kWh and air-conditioner capacity in BTU.
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
Frequently asked questions
How many joules are in one kilojoule?
1 kJ = 1,000 J.
How do I convert kJ to J?
Joules = kilojoules × 1,000.