Megajoule to Kilojoule Converter
Convert Megajoule (MJ) to Kilojoule (kJ) instantly. 1 MJ = 1,000 kJ.
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27 units available
1 MJ = 1,000 kJ
Formula:
kJ = MJ × 1,000With your value: 1 MJ = 1,000 kJ
How big is that?
Everyday references on a logarithmic scale, all expressed in megajoule so you can sanity-check the result.
Other Megajoule to Kilojoule conversions
Megajoule to Kilojoule Conversion Table
| Megajoule (MJ) | Kilojoule (kJ) |
|---|---|
| 0.5 | 500 |
| 1 | 1,000 |
| 2 | 2,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 15 | 15,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 250 | 250,000 |
| 500 | 500,000 |
| 1000 | 1,000,000 |
Kilojoule to Megajoule Conversion Table
| Kilojoule (kJ) | Megajoule (MJ) |
|---|---|
| 0.5 | 0.0005 |
| 1 | 0.001 |
| 2 | 0.002 |
| 5 | 0.005 |
| 10 | 0.01 |
| 15 | 0.015 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1000 | 1 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Megajoule (MJ)
Energy
Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Kilojoule (kJ)
Energy
Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert Megajoule to Kilojoule
To convert from Megajoule (MJ) to Kilojoule (kJ), multiply the value by 1,000.
Formula: kJ = MJ × 1,000
Reverse: MJ = kJ × 0.001
Step-by-Step Example
- Start with your value in Megajoule. For example: 5 MJ
- Multiply by the conversion factor: 5 x 1,000
- The result is: 5,000 kJ
About Megajoule
The megajoule (MJ) is a unit of energy and work. One megajoule equals 1.000000 × 10^+6 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
Common uses: energy calculations, engineering and science, education.
About Kilojoule
The kilojoule (kJ) is a unit of energy and work. One kilojoule equals 1000 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
Common uses: energy calculations, engineering and science, education.
Frequently Asked Questions
How many Kilojoule are in 1 Megajoule?
There are exactly 1,000 Kilojoule in 1 Megajoule. This means the conversion factor from Megajoule to Kilojoule is 1,000.
What is the formula to convert Megajoule to Kilojoule?
The formula to convert Megajoule to Kilojoule is: kJ = MJ × 1,000. For example, to convert 10 Megajoule to Kilojoule, you would multiply 10 by 1,000.
What is a Megajoule?
The megajoule (MJ) is a unit of energy and work. One megajoule equals 1.000000 × 10^+6 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
What is a Kilojoule?
The kilojoule (kJ) is a unit of energy and work. One kilojoule equals 1000 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
What are the common uses of Megajoule?
The Megajoule is commonly used in energy calculations, engineering and science, education.
Related Energy Conversions
Cite this page
UnitConvertLab. (2026). Megajoule to Kilojoule converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/megajoule-to-kilojoule