Kilojoule to Megajoule Converter
Convert Kilojoule (kJ) to Megajoule (MJ) instantly. 1 kJ = 0.001 MJ.
Energy Converter
27 units available
1 kJ = 0.001 MJ
Formula:
MJ = kJ × 0.001With your value: 1 kJ = 0.001 MJ
How big is that?
Everyday references on a logarithmic scale, all expressed in kilojoule so you can sanity-check the result.
Other Kilojoule to Megajoule conversions
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 |
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 |
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.
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
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
How to Convert Kilojoule to Megajoule
To convert from Kilojoule (kJ) to Megajoule (MJ), multiply the value by 0.001.
Formula: MJ = kJ × 0.001
Reverse: kJ = MJ × 1,000
Step-by-Step Example
- Start with your value in Kilojoule. For example: 5 kJ
- Multiply by the conversion factor: 5 x 0.001
- The result is: 0.005 MJ
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.
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.
Frequently Asked Questions
How many Megajoule are in 1 Kilojoule?
There are exactly 0.001 Megajoule in 1 Kilojoule. This means the conversion factor from Kilojoule to Megajoule is 0.001.
What is the formula to convert Kilojoule to Megajoule?
The formula to convert Kilojoule to Megajoule is: MJ = kJ × 0.001. For example, to convert 10 Kilojoule to Megajoule, you would multiply 10 by 0.001.
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 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 are the common uses of Kilojoule?
The Kilojoule is commonly used in energy calculations, engineering and science, education.
Related Energy Conversions
Cite this page
UnitConvertLab. (2026). Kilojoule to Megajoule converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/kilojoule-to-megajoule