Convert Kilocalories to Gigawatt-Hours
Convert Kilocalories (kcal) to Gigawatt-Hours (GWh) instantly and accurately.
Conversion Formula
GWh = kcal × 1.162222222e-9
About Kilocalories
A kilocalorie (kcal) - the food Calorie (capital C) on US and Canadian nutrition labels - is exactly 4,184 J. WHO recommends ~2,000-2,500 kcal/day for adults. Energy density of nutrients: fat 9 kcal/g, carbohydrate 4 kcal/g, protein 4 kcal/g, ethanol 7 kcal/g. Running at 10 km/h burns ~600-800 kcal/h. Standard free energy of ATP hydrolysis is approximately −7.3 kcal/mol (−30.5 kJ/mol). Pre-SI thermodynamic tables in the US and Japan use kcal/mol for reaction enthalpies. 1 kcal = 4,184 J = 4.184 kJ = 3.968 BTU = 1.163 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
| Kilocalories (kcal) | Gigawatt-Hours (GWh) |
|---|---|
| 1 kcal | 1.162 × 10-9 GWh |
| 2 kcal | 2.324 × 10-9 GWh |
| 5 kcal | 5.811 × 10-9 GWh |
| 10 kcal | 1.162 × 10-8 GWh |
| 25 kcal | 2.906 × 10-8 GWh |
| 50 kcal | 5.811 × 10-8 GWh |
| 100 kcal | 1.162 × 10-7 GWh |