Megajoule (MJ)
The megajoule (MJ) is one million joules. 3.6 MJ equals exactly 1 kWh.
Symbol: MJ
Quantity: energy, work and heat
SI relation: 1 MJ = 1000000 J (exact)
Derivation: 1 MJ = 10⁶ J
Exact: yes, by definition
Typical uses
- Fuel heating values (natural gas ≈ 38 MJ/m³, diesel ≈ 45 MJ/kg)
- Energy statistics and gas billing
- Explosion and crash energy
Convert megajoules to other units
| Conversion | 1 MJ equals | Reverse |
|---|---|---|
| megajoule to joule | 1000000 J | joule to megajoule |
| megajoule to kilojoule | 1000 kJ | kilojoule to megajoule |
| megajoule to kilocalorie | 239.0057361 kcal | kilocalorie to megajoule |
| megajoule to kilowatt-hour | 0.2777777778 kWh | kilowatt-hour to megajoule |
| megajoule to BTU | 947.8171203 BTU | BTU to megajoule |
| megajoule to calorie | 239005.7361 cal | calorie to megajoule |
| megajoule to watt-hour | 277.7777778 Wh | watt-hour to megajoule |
| megajoule to therm | 0.00948043428 thm | therm to megajoule |
| megajoule to electronvolt | 6.241509074 × 10²⁴ eV | electronvolt to megajoule |
| megajoule to foot-pound | 737562.1493 ft·lbf | foot-pound to megajoule |
| megajoule to erg | 10000000000000 erg | erg to megajoule |
Open the Energy Converter to convert any value between all units.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Megajoule (MJ). Retrieved October 17, 2026, from https://scientificconverters.com/units/megajoule/
IEEE
Scientific Converters, "Megajoule (MJ)," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/units/megajoule/