If you need 1.5g of protein per pound of bodyweight to maintain lean mass, how many grams do I need

I was told this: You need 1.5 grams of protein per pound of body weight to maintain your current lean mass.
So I am 5'9 and I weigh 58kgs (127 pounds). How many grams of protein do I need to maintain and/or gain body weight (muscle). And I'm talking per day.

58 kg = 127.6 lb
127.6 lb × (1.5 g/lb) = 191.4 g

127 lb × 1.5 g/lb = 190.5 g of protein; the lb's cancel in the dimensions

Since 1 gram = 0.00220462262 lb
Then 190.5 g = 0.41998060911 lb of protein