You can't. Calories are a unit of energy and grams are units of mass.
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To convert calories into grams, you need to know the specific nutrient density of the food you are calculating. Typically, you can use the general conversion that 1 gram of carbohydrates or protein is equivalent to 4 calories, and 1 gram of fat is equivalent to 9 calories. By dividing the number of calories by the conversion factor, you can get an estimate of the grams of macronutrients in the food.
You will consume 40 calories from the carbohydrates (4 calories per gram) and 90 calories from the fat (9 calories per gram), totaling 130 calories from the 20 grams of potato chips.
Carbohydrates provide 4 calories per gram, protein provides 4 calories per gram, and fat provides 9 calories per gram. So, the total number of calories in the food would be (20 grams carbohydrate x 4) + (8 grams protein x 4) + (5 grams fat x 9) = 80 + 32 + 45 = 157 calories.
Depends on the substance, 30 grams of apple is a HUGE difference in calories to 30 grams of sugar.
80 calories per gram (called the latent heat of fusion) 80 x 255.67 = 20453.6 calories
Jicama is low in calories and a good source of fiber, vitamin C, and potassium. It is also fat-free and cholesterol-free. One cup of jicama contains about 49 calories, 6 grams of fiber, 4.7 grams of sugar, and 272 mg of potassium.