How much energy is in a Mars bar per 100g?
                                
                                
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                                    4 min read                                
                            
                                According to official nutritional data, a standard Mars bar contains approximately 448 kilocalories (kcal) of energy per 100g, or 1882 kilojoules (kJ). This high energy density comes primarily from its rich combination of sugar, caramel, and milk chocolate.