Convert Calories to Gigawatt-Hours
Convert Calories (cal) to Gigawatt-Hours (GWh) instantly and accurately.
Conversion Formula
GWh = cal × 1.162222222e-12
About Calories
A calorie (cal) - the thermochemical calorie - is exactly 4.184 J, defined as the heat to raise 1 g of water by 1°C. Standard since 1954. The calorie is the fundamental unit of heat measurement in thermochemistry: glucose combustion releases 669.9 kcal/mol; water vaporisation requires 539.7 cal/g. Bond dissociation energies in quantum chemistry are often quoted in kcal/mol. Note: the dietary Calorie (capital C) on food labels is 1 kcal = 4,184 J - a factor-of-1,000 difference that causes persistent confusion. 1 cal = 4.184 J = 1.163 × 10⁻³ Wh.
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
| Calories (cal) | Gigawatt-Hours (GWh) |
|---|---|
| 1 cal | 1.162 × 10-12 GWh |
| 2 cal | 2.324 × 10-12 GWh |
| 5 cal | 5.811 × 10-12 GWh |
| 10 cal | 1.162 × 10-11 GWh |
| 25 cal | 2.906 × 10-11 GWh |
| 50 cal | 5.811 × 10-11 GWh |
| 100 cal | 1.162 × 10-10 GWh |