橘子的含水量較高，熱量在水果中屬於中下水平，其維生素C含量並非很高，遠低於獼猴桃、無花果等水果，適宜減肥期間食用。
卡路裏（簡稱卡，縮寫為cal），由英文Calorie音譯而來，其定義為在1個大氣壓下，將1克水提升1攝氏度所需要的熱量；卡路裏（calorie）是能量單位，現在仍被廣泛使用在營養計量和健身手冊上，國際標準的能量單位是焦耳（joule）。
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