Convert Megajoules to Gigawatt-Hours
Convert Megajoules (MJ) to Gigawatt-Hours (GWh) instantly and accurately.
Conversion Formula
GWh = MJ × 2.777777778e-7
About Megajoules
A megajoule (MJ) is 10⁶ J - the scale of fuel combustion in vehicles and kinetic energy of road traffic. Energy content: 1 L diesel ~34.9 MJ; 1 L petrol ~32.2 MJ. A 1,500 kg car at 100 km/h has KE = ½ × 1,500 × 27.78² ≈ 0.579 MJ; at 200 km/h it carries 2.31 MJ - explaining crash severity's quadratic speed dependence. A 60 kWh EV battery stores 60 × 3.6 = 216 MJ. Detonation of 1 kg TNT releases 4.184 MJ. Adults at rest metabolise ~6-9 MJ/day. 1 MJ = 10⁶ J = 239.0 kcal = 0.27778 kWh = 947.8 BTU.
About Gigawatt-Hours
A gigawatt-hour (GWh) is the energy from 1 GW for one hour - exactly 3.6 TJ. National electricity generation is reported in annual GWh: Ireland ~32,000 GWh/year; France ~496,000 GWh/year. The Hornsea One offshore wind farm (1.12 GW) generates ~4,000 GWh/year. The Bath County Pumped Storage (3 GW, USA) stores ~24 GWh. World total battery storage capacity reached ~1,600 GWh by end-2022. Energy of 1 megaton TNT ≈ 1.162 GWh. 1 GWh = 3.6 TJ = 1,000 MWh = 3.412 × 10⁹ BTU.
Quick Reference Table
| Megajoules (MJ) | Gigawatt-Hours (GWh) |
|---|---|
| 1 MJ | 2.778 × 10-7 GWh |
| 2 MJ | 5.556 × 10-7 GWh |
| 5 MJ | 1.389 × 10-6 GWh |
| 10 MJ | 2.778 × 10-6 GWh |
| 25 MJ | 6.944 × 10-6 GWh |
| 50 MJ | 1.389 × 10-5 GWh |
| 100 MJ | 2.778 × 10-5 GWh |