I honestly haven’t researched optimal protein consumption a whole lot. I feel I know when I’ve had enough protein, and don’t feel that protein hunger anymore. Usually for me this happens around 100g – 150g of protein, and I’m 170lbs, maybe 10% body fat, so 153 lbs lean mass. This would be between 2/3 and 1 gram of protein per lean lb of body mass.
I hear around 1 g / lb of lean is pretty good for active people. I don’t know if lightly or inactive people need as much as that even. I also hear though that pretty high protein diets are quite good.