⚡ Physics & Nutritional Thermodynamics
Energy & Calorie ($\text{kcal} \leftrightarrow \text{Joule} \leftrightarrow \text{kWh}$) Converter
Convert nutritional and physical energy across Dietary Calories ($\text{kcal}$), Joules ($\text{J}$), Kilojoules ($\text{kJ}$), Kilowatt-hours ($\text{kWh}$), and $\text{BTU}$.
🥗 Standard 2,000 kcal Diet (8,368 kJ)
🔌 1 kWh Electricity (3.6 MJ = 860 kcal)
🍕 Slice of Pizza (280 kcal = 1,171 kJ)
🔥 1 BTU (1,055 Joules)
🥑 1g Dietary Fat (9 kcal = 37.7 kJ)
Input Energy Amount
Metric Kilojoules (kJ)
8,368.0 kJ
Food kcal
2,000 kcal
kWh
2.326 kWh
BTU
7,936 BTU
💡 Energy Equivalence:
$$1\text{ Food Calorie (kcal)} = 4.184\text{ kJ} = 4,184\text{ Joules} \approx 3.968\text{ BTU}$$
Understanding Calories vs Joules vs Kilowatt-Hours
Energy is the quantitative property transferred to a body to perform physical work or heat a substance:
- Food Calorie (kcal): The energy required to raise the temperature of $1\text{ kilogram of water}$ by $1^\circ\text{C}$ ($1\text{ kcal} = 4,184\text{ Joules}$). In nutrition, "Calorie" with a capital C refers to a kilocalorie.
- SI Joule (J): $1\text{ Joule} = 1\text{ Newton}\cdot\text{meter} = 1\text{ Watt}\cdot\text{second}$.
- Kilowatt-Hour (kWh): Commercial unit of electrical energy ($1\text{ kWh} = 1,000\text{ W} \times 3,600\text{ s} = 3.6 \times 10^6\text{ Joules} = 3.6\text{ MJ}$).