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One calorie is 1/4500 calories. 1g fat is equivalent to 9 calories, and one kilogram of fat is equivalent to 4500 calories. Calories are Calories, transliterated from English calorie, and defined as the heat required to heat 1 g water to 1℃ at1atmospheric pressure. Calories are energy units and are still widely used in nutrition measurement and fitness manuals. The international standard unit of energy is joule, 1 calorie =4. 1868 joule.