Convert Millijoules to Megawatt-Hours
Convert Millijoules (mJ) to Megawatt-Hours (MWh) instantly and accurately.
Conversion Formula
MWh = mJ × 2.777777778e-13
About Millijoules
A millijoule (mJ) is 10⁻³ J - the scale of surgical lasers, spark ignition, and the kinetic energy of small everyday objects. Nd:YAG lasers for ophthalmology and tattoo removal deliver 10-200 mJ per pulse. The minimum spark energy to ignite methane-air is ~0.29 mJ; an automotive spark plug discharges 30-60 mJ per cycle. A 2 g mosquito flying at 1 m/s has kinetic energy ½ × 0.002 × 1² = 1 mJ. Electrocautery monopolar pulses deliver 50-500 mJ to coagulate blood vessels. 1 mJ = 10⁻³ J = 0.2390 cal.
About Megawatt-Hours
A megawatt-hour (MWh) is the energy from 1 MW for one hour - exactly 3.6 GJ. It is the standard unit for wholesale electricity trading. Power purchase agreements (PPAs) specify capacity and price in $/MWh or €/MWh. A 5 MW wind turbine at full capacity generates 5 MWh/h. Primary aluminium smelting consumes 13-15 MWh per tonne. The Moss Landing battery (California) stores 3,287 MWh. The daily output of a 1 GW nuclear plant at 90% capacity factor is ~21,600 MWh. 1 MWh = 3.6 GJ = 3,412,141 BTU = 1,000 kWh.
Quick Reference Table
| Millijoules (mJ) | Megawatt-Hours (MWh) |
|---|---|
| 1 mJ | 2.778 × 10-13 MWh |
| 2 mJ | 5.556 × 10-13 MWh |
| 5 mJ | 1.389 × 10-12 MWh |
| 10 mJ | 2.778 × 10-12 MWh |
| 25 mJ | 6.944 × 10-12 MWh |
| 50 mJ | 1.389 × 10-11 MWh |
| 100 mJ | 2.778 × 10-11 MWh |