Convert Calories to Kilowatt-Hours
Convert Calories (cal) to Kilowatt-Hours (kWh) instantly and accurately.
Conversion Formula
kWh = cal × 1.162222222e-6
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 Kilowatt-Hours
A kilowatt-hour (kWh) is the energy consumed by 1 kW for one hour - exactly 3,600,000 J = 3.6 MJ. All domestic electricity meters bill in kWh. Appliance benchmarks: fridge 180-250 kWh/year; washing machine 0.5-2.0 kWh/cycle; air conditioner 1-3 kWh/h. EVs consume 13-25 kWh/100 km; the Lucid Air achieves ~15.9 kWh/100 km (WLTP). Producing 1 tonne of primary aluminium requires ~13,000-15,000 kWh. Global electricity generation is ~29,165 TWh ≈ 2.9 × 10¹³ kWh/year. 1 kWh = 3.6 MJ = 3,412.1 BTU = 859.85 kcal.
Quick Reference Table
| Calories (cal) | Kilowatt-Hours (kWh) |
|---|---|
| 1 cal | 1.162 × 10-6 kWh |
| 2 cal | 2.324 × 10-6 kWh |
| 5 cal | 5.811 × 10-6 kWh |
| 10 cal | 1.162 × 10-5 kWh |
| 25 cal | 2.906 × 10-5 kWh |
| 50 cal | 5.811 × 10-5 kWh |
| 100 cal | 0.000116222 kWh |