Food Information. Per 100 g / mL serving the food Caramel Custard Flan within the category Desserts has a total of 145.0 calories and the following nutrition facts: 4.5 g protein, 22.8 g carbs and 4.0 g fat. All other nutritional information like vitamins and minerals you can find above within the calorie chart for the food Caramel Custard Flan.