Energy Converter
4.18
1 kcal = 4.18 kJ
Food Calorie Reference
| Food | kcal | kJ |
|---|---|---|
| Apple (medium) | 95 kcal | 397 kJ |
| Banana (medium) | 105 kcal | 439 kJ |
| Slice of bread | 79 kcal | 331 kJ |
| Egg (large, boiled) | 78 kcal | 326 kJ |
| Chicken breast (100g) | 165 kcal | 690 kJ |
| Rice (1 cup cooked) | 206 kcal | 862 kJ |
| Cheeseburger | 303 kcal | 1268 kJ |
| Pizza slice | 285 kcal | 1193 kJ |
Electricity Usage
| Appliance | Power | Daily Use |
|---|---|---|
| LED bulb | 10 W | 0.24 kWh |
| Laptop | 50 W | 0.4 kWh |
| Desktop PC | 200 W | 1.6 kWh |
| Refrigerator | 150 W | 3.6 kWh |
| Washing machine | 500 W | 0.5 kWh |
| Microwave | 1,000 W | 0.25 kWh |
| Hair dryer | 1,800 W | 0.3 kWh |
| Electric oven | 2,400 W | 2.4 kWh |
Energy Equivalents
1 food Calorie (kcal)4,184 J = 4.184 kJ
1 kWh of electricity3,600,000 J = 3,412 BTU
1 gallon of gasoline~131,760 BTU = 138.7 MJ
Daily human intake (~2000 kcal)8,368 kJ = 2.33 kWh
AA battery~9,360 J = 2.6 Wh
Tesla battery (75 kWh)270,000,000 J = 270 MJ
Quick Tips
Calories vs Kilocalories
Food "Calories" (capital C) are actually kilocalories (kcal). 1 food Calorie = 1 kcal = 1000 cal.
kJ to kcal
Divide kilojoules by 4.184 for kilocalories. Example: 500 kJ ÷ 4.184 ≈ 120 kcal
kWh Cost
Average US electricity costs ~$0.12/kWh. A 1000W appliance running 1 hour = 1 kWh ≈ $0.12
BTU to kWh
Divide BTU by 3,412 for kWh. Example: 10,000 BTU ÷ 3,412 ≈ 2.93 kWh