Watt-Hours (Wh) to Kilocalories (kcal) Converter
Enter a value to instantly convert between energy units.
1 Watt-Hour = 0.8604 Kilocalorie
Key Formulas
Kilocalorie → Kilojoule
kJ = kcal × 4.184Kilojoule → Kilocalorie
kcal = kJ × 0.239006Kilowatt-Hour → Joule
J = kWh × 3600000Joule → Kilowatt-Hour
kWh = J × 2.77778e-7Formula
kcal = Wh × 0.859845One watt-hour equals 0.859845 kilocalories (dietary Calories). This conversion bridges electrical and nutritional energy scales, allowing comparison of battery capacity to food energy, exercise burn estimates to work done, and renewable energy output to metabolic equivalent. It reveals why batteries store less energy per unit mass than chemical fuels — 1 kWh ≈ 860 kcal of equivalent food energy.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A fitness tracker showing 100 Wh burned during a 1-hour workout = 86 kcal (food Calories).
100 Wh = 85.9845 kcal
Daily metabolic requirement of 2000 kcal/day = 2327 Wh equivalent electrical energy consumption.
2400 Wh = 2063.628 kcal
A 500 Wh battery pack stores energy equivalent to 430 kcal — about one-quarter daily food intake.
500 Wh = 429.9225 kcal
Solar panel generating 1 kWh per day = 860 kcal energy output for home energy audit.
1000 Wh = 859.845 kcal