Converting calories to joules is essential in various scientific and nutritional contexts, as both units measure energy. A calorie is defined as the amount of energy required to raise the temperature of one gram of water by one degree Celsius. In the International System of Units (SI), the joule is the standard unit of energy. The conversion factor between these units is precise: 1 calorie equals 4.184 joules. Therefore, to convert calories to joules, multiply the number of calories by 4.184. For example, 10 calories equal 41.84 joules. This conversion is crucial in fields like physics, chemistry, and nutrition, where energy measurements are fundamental.