Calculators/Energy Converter
Energy Converter
Convert between joules, calories, BTU, kWh, and more.
1 kcal = 4.184 kJ
| Kilocalories (food Cal) (kcal) | Kilojoules (kJ) |
|---|---|
| 1 | 4.184 |
| 2 | 8.368 |
| 5 | 20.92 |
| 10 | 41.84 |
| 15 | 62.76 |
| 20 | 83.68 |
| 25 | 104.6 |
| 50 | 209.2 |
| 75 | 313.8 |
| 100 | 418.4 |
| 150 | 627.6 |
| 200 | 836.8 |
| 250 | 1,046 |
| 500 | 2,092 |
| 1,000 | 4,184 |
Energy Conversion Reference
| From | To |
|---|---|
| 1 kilowatt-hour (kWh) | 3,600,000 J / 3,412 BTU |
| 1 calorie (cal) | 4.184 joules |
| 1 food Calorie (kcal) | 4,184 J / 1,000 calories |
| 1 BTU | 1,055 joules |
Calories vs Kilocalories
When food packaging says "200 Calories," it actually means 200 kilocalories (kcal) — not the scientific calorie used in chemistry. The food Calorie (with a capital C) equals 1 kcal, which equals 1,000 small calories. This naming convention causes endless confusion.
In scientific contexts, use joules (J) or kilojoules (kJ) for energy to avoid ambiguity. A food Calorie is about 4.184 kJ. Your daily energy intake of 2,000 food Calories is roughly 8,368 kJ.