Convert Watt-Hours to Gigawatt-Hours
Convert Watt-Hours (Wh) to Gigawatt-Hours (GWh) instantly and accurately.
Conversion Formula
GWh = Wh × 1.000000000e-9
About Watt-Hours
A watt-hour (Wh) is the energy delivered by 1 watt for one hour - exactly 3,600 J. It is the practical unit for small-scale electrical energy: a 10,000 mAh 5 V power bank stores 50 Wh; a laptop battery holds 50-90 Wh; a smartphone battery holds 10-15 Wh; an AA alkaline cell stores ~3 Wh. LED lamps labelled 9 W save 51 Wh/h over a 60 W incandescent. IATA dangerous-goods rules use Wh as the threshold for lithium batteries in aircraft: cells >20 Wh and batteries >100 Wh need special approval. 1 Wh = 3,600 J = 3.412 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
| Watt-Hours (Wh) | Gigawatt-Hours (GWh) |
|---|---|
| 1 Wh | 1 × 10-9 GWh |
| 2 Wh | 2 × 10-9 GWh |
| 5 Wh | 5 × 10-9 GWh |
| 10 Wh | 1 × 10-8 GWh |
| 25 Wh | 2.5 × 10-8 GWh |
| 50 Wh | 5 × 10-8 GWh |
| 100 Wh | 1 × 10-7 GWh |