These are some guidelines I like for macro nutrient ratios, for different goals.
As you can see the only difference is in the amount of carbs.
Weight loss
Protein: 3g per kg bodyweight
Carbs: 2g per kg bodyweight
Fat: 1g per kg bodyweight
Calories: 29 x bodyweight in kg.
Maintanance
Protein: 3g per kg bodyweight
Carbs: 3g per kg bodyweight
Fat: 1g per kg bodyweight
Calories: 33 x bodyweight in kg.
Weight gain
Protein: 3g per kg bodyweight
Carbs: 4g per kg bodyweight
Fat: 1g per kg bodyweight
Calories: 37 x bodyweight in kg.
