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However, athletes trying to build muscle need 0.6 to 0.82 gram of protein per pound of body weight per day, according to a review published in a 2011 edition of the âJournal of Sports Sciences.â For example, a 160-pound man trying to bulk up may need up to 131 grams of protein each day.
The answer is how much protein you need in grams. 1  For a sedentary to moderate lifestyle, multiply by 0.4. 2  For an active lifestyle, multiply by 0.4 to 0.6. 3  For an athlete who's building muscle or for a young athlete, you need 0.6 to 0.9 grams per pound. For a sedentary to moderate lifestyle, multiply by 0.4. 2  So if you weigh 140 pounds, you need 56 grams of protein a day. 3  For an active lifestyle, multiply by 0.4 to 0.6. 4  So if you weigh 140 pounds, you need 56 grams to 84 grams of protein a day.