From the Registered Dieticians at the Diabetes and Endocrine Clinic, Alberta Children’s Hospital:

Cupcakes have 15g of carbs for a plain, medium cupcake (1/24^th of a Betty Crocker cake mix), plus 10g of carbs for every tablespoon of icing. For a typical cupcake with about 1 tbsp of icing, that totals 25g of carbohydrates. For one piled high with icing (think: boutique bakery cupcakes) this may mean 35g of carbs or more.

Straight Sugar Candies (hard candy, gummies, suckers and jawbreakers) have a carb factor of 0.9 to 1.0. That is, when you weigh the item on a scale, for every gram of weight the candy will have close to one gram of carbs. For example, a heart sucker that weighs 5g will have about 4.5 to 5g of carbs; a gummy rose weighing 22g will have 20 to 22g of carbs.

For plain chocolate, 0.55 is a rough estimate of its carb factor. That is, if you weigh the item on a scale, there will be just over 1/2g of carbs for every gram of weight. For example, a chocolate teddy bear weighing 50g will have about 28g of carbs; a handful of (plain) Hershey’s kisses weighing 30g will have about 16g of carbs.