Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 MJ | 2.77778e-07 MWh | |
| 0.01 MJ | 2.77778e-06 MWh | |
| 0.1 MJ | 2.77778e-05 MWh | |
| 1 MJ | 0.000277778 MWh | |
| 5 MJ | 0.00138889 MWh | |
| 10 MJ | 0.00277778 MWh | |
| 50 MJ | 0.0138889 MWh | |
| 100 MJ | 0.0277778 MWh | |
| 1000 MJ | 0.277778 MWh |
Formula: Megawatt-Hour = Megajoule × 0.0002778
Multiply any megajoule value by 0.0002778 to get megawatt-hour.
Reverse: Megajoule = Megawatt-Hour × 3600
Common megajoule values — factor: 1 MJ = 0.0002778 MWh
| Megajoule (MJ) | Megawatt-Hour (MWh) | Context |
|---|---|---|
| 0.001 MJ | 2.778e-07 MWh | 1 kJ |
| 0.01 MJ | 2.778e-06 MWh | 10 kJ |
| 0.1 MJ | 2.778e-05 MWh | 100 kJ |
| 1 MJ | 0.0002778 MWh | 1 MJ |
| 3.6 MJ | 0.001 MWh | 1 kWh |
| 10 MJ | 0.002778 MWh | 10 kWh |
| 34 MJ | 0.009444 MWh | 1L petrol |
| 100 MJ | 0.02778 MWh | ~28 kWh |
| 360 MJ | 0.1 MWh | 100 kWh |
| 1,000 MJ | 0.2778 MWh | ~278 kWh |
| 4,600 MJ | 1.278 MWh | 1 tonne TNT |
| 1e+04 MJ | 2.778 MWh | ~2.8 MWh |
| 1e+05 MJ | 27.78 MWh | ~28 MWh |
| 1e+06 MJ | 277.8 MWh | ~278 MWh |
| 1.000e+09 MJ | 2.778e+05 MWh | ~278 GWh |
1 MJ = 0.0002778 MWh. Memorize for instant estimates.
Use 0.0002778 as a quick mental multiplier.
Multiply result by 3600 to recover the original MJ value.
Measures fuel energy content — 1 liter of petrol ≈ 34 MJ.
Compares battery pack energy in MJ and kWh for range calculations.
Quantifies explosive yield — 1 kg TNT ≈ 4.6 MJ.
Calculates daily/annual energy yield of solar and wind in MJ.
Compares fuel energy costs across transport modes in MJ/km.
Models annual heating and cooling energy demand in MJ.
The megajoule (MJ) equals 1,000,000 joules and is used for large-scale energy measurements in engineering, transportation, and industrial processes.
One liter of petrol contains about 34 MJ of chemical energy. A bolt of lightning releases about 1-5 MJ. An adult's daily food intake is roughly 8-10 MJ. Electric vehicle batteries are typically rated at 40-100 MJ (11-28 kWh).
Interesting fact: The kinetic energy of a 1,000 kg car traveling at 100 km/h is about 0.385 MJ. TNT explosive releases about 4.6 MJ per kilogram when detonated.
The megawatt-hour (MWh) equals 1,000 kWh or 3.6 × 10⁹ joules. It is the standard unit for utility-scale electricity generation, large industrial consumers, and grid-level energy storage.
Power plants, wind farms, and solar installations are rated and billed in MWh. A 2 MW wind turbine generates about 6 MWh per day on average. Large data centers consume thousands of MWh per month.
Interesting fact: The Hoover Dam generates about 4,000 MWh per hour. A single nuclear power plant produces about 8,000 MWh per hour. World electricity consumption is approximately 25,000 TWh (25 billion MWh) per year.
Converting megajoule to megawatt-hour is common across energy, nutrition, engineering, and science. Different sectors use different energy units — joules in physics, kcal in nutrition, kWh in electricity, and BTU in HVAC — making accurate conversion essential for cross-disciplinary work and international comparisons.
Quick reference: 5 MJ = 0.001389 MWh and 10 MJ = 0.002778 MWh. Reverse: 1 MWh = 3600 MJ. Exact factor: 1 MJ = 0.0002778 MWh.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.