This calculator uses the Atwater system, which is the standard method for calculating calories from macronutrients:
The total is the sum of calories from each macronutrient.
You can find the grams of protein, carbohydrates, and fat on the "Nutrition Facts" label of most packaged foods. This calculator is perfect for understanding how those numbers translate to total calories.
This tool provides a calculation based on standard values. The actual caloric content on a food label may vary slightly due to factors like fiber content. Always refer to the label for the most accurate information.