Question: how much insulin for 1 gram of carbohydrate?
Answer: The insulin-to-carb ratio means you will take 1 unit of insulin for a certain amount of carbohydrate. For example, if your insulin-to-carb ratio is 1 unit of insulin for every 10 grams of carbohydrate (written 1:10), you will take 1 unit of insulin for every 10 grams of carbohydrate you eat.