How many calories in a gram?

[JdFlex]

I've read there are 3 calories per gram of carbs and protein and 9 in a gram of fat. But I've also read there are 4 calories per gram of carbs and protein and 10 in a gram of fat. Which is correct?

[The Giant Killer]

4 calories per gram in carbs and protein
9 calories per gram in fats

[Scooby1]

there are 4 calories in carbohydrates and protien
9 in fat.