Convert Joules to Gigawatt-Hours
Convert Joules (J) to Gigawatt-Hours (GWh) instantly and accurately.
Conversion Formula
GWh = J × 2.777777778e-13
About Joules
The joule (J) is the SI unit of energy, defined as one newton acting through one metre (1 J = 1 N·m = 1 kg·m²/s²). Named after James Prescott Joule, whose 1840s paddle-wheel experiments established the mechanical equivalent of heat (~4.15 J = 1 calorie). One joule is modest: it lifts a 100 g apple by 1 m, heats 0.239 mL of water by 1°C, or powers a 1 W LED for 1 second. Daily adult resting metabolism is ~6-9 MJ. 1 J = 1 W·s = 0.23901 cal = 9.4782 × 10⁻⁴ BTU = 2.7778 × 10⁻⁷ kWh.
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
| Joules (J) | Gigawatt-Hours (GWh) |
|---|---|
| 1 J | 2.778 × 10-13 GWh |
| 2 J | 5.556 × 10-13 GWh |
| 5 J | 1.389 × 10-12 GWh |
| 10 J | 2.778 × 10-12 GWh |
| 25 J | 6.944 × 10-12 GWh |
| 50 J | 1.389 × 10-11 GWh |
| 100 J | 2.778 × 10-11 GWh |