To convert megajoules to kilojoules, multiply by 1000.
The calculation uses 1 MJ = 1000 kJ. Results are displayed to at most 10 significant digits. Definitions can be exact while a displayed decimal is rounded. Match the displayed precision to your original measurement.
The formula
value in kJ = value in MJ × 1000
MJ- Input unit: megajoules
kJ- Output unit: kilojoules
How to use this calculator
- Enter a value in MJ.
- Multiply by the stored conversion factor.
- Read the result in kJ; divide by the same factor to convert back.
Worked examples
Worked conversion
1 MJ × 1000 ≈ 1000 kJ.
Reverse conversion
1000 kJ ÷ 1000 ≈ 1 MJ. Rounding intermediate values can change the last displayed digit.
Frequently asked questions
What factor does this converter use?
It uses 1000 kJ per MJ.
Why can another converter show a slightly different answer?
Check the unit convention first (such as US versus Imperial or decimal versus binary), then compare rounding. Measurement uncertainty is separate from the unit conversion.
MJ to kJ table
| MJ | kJ (rounded) |
|---|---|
| 0 | 0 |
| 1 | 1000 |
| 2 | 2000 |
| 5 | 5000 |
| 10 | 10000 |
| 100 | 100000 |
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