Do you mean what percentage of carbs are converted to glucose? (sugar is just another carb)
All carbohydrate converts to glucose. However, when a particular food contains carbohydrate and also contains other nutrients, (protein and fat) only the portion that is carbohydrate will turn to glucose immediately. The protein and fat parts have the ability to turn to glucose but this is not immediate, and doesn't always happen. It usually only happens when the glucose levels in our body is low.