Convert Megajoules to Kilowatt-hours
1 megajoule (MJ) equals 0.2777777778 kilowatt-hours (kWh).
1 MJ = 0.2777777778 kWh
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk megajoule to kilowatt-hour converter to paste a column from Excel.
How to Convert Megajoule to Kilowatt-hour
- 1 MJ = 0.2777777778 kWh
- 1 kWh = 3.6 MJ
- Example: convert 15 MJ to kWh: 15 MJ = 15 × 0.2777777778 kWh = 4.166666667 kWh
Formula
kWh = MJ × 0.2777777777778
or kWh = MJ ÷ 3.6
Derivation from SI units:
- 1 MJ = 10⁶ J
- 1 kWh = 1000 W × 3600 s = 3.6 × 10⁶ J
- 1 MJ = 1000000 J ÷ 3600000 J per kWh = 0.2777777777778 kWh
Both units are defined exactly, so the factor is exact. Megajoule definition: megajoule; Kilowatt-hour definition: kilowatt-hour.
Worked examples
- One cubic metre of natural gas at about 38 MJ holds 10.55555556 kWh.
38 MJ × 0.2777777778 = 10.55555556 kWh - One kilogram of diesel at about 45 MJ holds 12.5 kWh.
45 MJ × 0.2777777778 = 12.5 kWh
Megajoule to Kilowatt-hour conversion table
| Megajoules (MJ) | Kilowatt-hours (kWh) |
|---|---|
| 1 MJ | 0.2777777778 kWh |
| 3.6 MJ | 1 kWh |
| 10 MJ | 2.777777778 kWh |
| 35 MJ | 9.722222222 kWh |
| 38 MJ | 10.55555556 kWh |
| 45 MJ | 12.5 kWh |
| 50 MJ | 13.88888889 kWh |
| 100 MJ | 27.77777778 kWh |
| 1000 MJ | 277.7777778 kWh |
Where it's used
Fuel energy contents in MJ are converted to kWh to compare fuels with electricity. Divide by 3.6.
Megajoule to other energy units
| Conversion | 1 MJ equals |
|---|---|
| megajoule to joule | 1000000 J |
| megajoule to kilojoule | 1000 kJ |
| megajoule to calorie | 239005.7361 cal |
| megajoule to kilocalorie | 239.0057361 kcal |
| megajoule to watt-hour | 277.7777778 Wh |
| megajoule to kilowatt-hour | 0.2777777778 kWh |
| megajoule to BTU | 947.8171203 BTU |
| megajoule to therm | 0.00948043428 thm |
| megajoule to electronvolt | 6.241509074 × 10²⁴ eV |
| megajoule to foot-pound | 737562.1493 ft·lbf |
| megajoule to erg | 10000000000000 erg |
Frequently asked questions
How many kWh is 1 MJ?
1 MJ = 0.2777777778 kWh.
How many kilowatt-hours are in 1 megajoule?
1 MJ = 0.2777777778 kWh.
How do I convert megajoules to kilowatt-hours?
Multiply the value in MJ by 0.2777777778, or divide it by 3.6. For example, 15 MJ × 0.2777777778 = 4.166666667 kWh.
Is the MJ to kWh conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "kilowatt hour (kW·h)".
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). Convert Megajoules to Kilowatt-hours. Retrieved October 17, 2026, from https://scientificconverters.com/energy/megajoules-to-kilowatt-hours/
IEEE
Scientific Converters, "Convert Megajoules to Kilowatt-hours," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/megajoules-to-kilowatt-hours/