Calories to Kilojoules Converter
Convert dietary Calories (kcal) to Kilojoules (kJ) using the thermochemical standard. Essential for international nutrition labeling and diet planning.
About
Energy content in food is measured differently depending on the region. While the United States primarily utilizes the large Calorie (kcal), most other countries and scientific communities rely on the Kilojoule (kJ), an SI unit of energy. This discrepancy often leads to confusion when interpreting nutrition labels on imported goods or scientific dietary studies.
The conversion is based on the thermochemical definition where one dietary Calorie (which is actually a kilocalorie) is equivalent to exactly 4.184 kilojoules. Precision is necessary here; rounding errors in cumulative diet tracking can lead to significant discrepancies in daily energy intake estimation. This tool facilitates the translation between these units, aiding dietitians, athletes, and travelers in maintaining consistent energy tracking regardless of labeling standards.
Formulas
The conversion relies on the specific heat capacity of water definition for the thermochemical calorie. The relationship is linear and constant.
To reverse the calculation (Kilojoules to Calories):
Reference Data
| Food Item | Quantity | Energy (kcal) | Energy (kJ) |
|---|---|---|---|
| Apple (Medium) | 182 g | 95 | 397 |
| Banana (Medium) | 118 g | 105 | 439 |
| Egg (Large, Boiled) | 50 g | 78 | 326 |
| Bread (Slice, White) | 30 g | 79 | 330 |
| Rice (Cooked, White) | 158 g | 205 | 858 |
| Chicken Breast (Roasted) | 100 g | 165 | 690 |
| Salmon (Cooked) | 100 g | 206 | 862 |
| Almonds | 28 g | 164 | 686 |
| Cheddar Cheese | 28 g | 115 | 481 |
| Milk (Whole) | 240 ml | 149 | 623 |
| Orange Juice | 240 ml | 112 | 469 |
| Potato (Baked) | 173 g | 161 | 674 |
| Avocado | 200 g | 322 | 1347 |
| Butter | 14 g | 102 | 427 |
| Olive Oil | 14 g | 119 | 498 |