how many calories comes from 1 gram of protein?
If you are talking about getting 100 calories from pure protein, there are 25 grams of protein. However, a lot of foods have a mixture of protein, carbohydrate, and fat. So th â¦ is isn't necessarily the case with all foods. Take a look at the nutrition fact label to see how many grams of protein/fat/carbohydrate are in each serving. 1g protein=4 calories 1g carbohydrate=4 calories 1g alcohol=7 calories 1g fat=9 calories. 7 people found this useful.