How much protein do you need to eat in order to build muscle? One gram of protein per pound of bodyweight per day is a good recommendation for athletes so a 160 pound bodybuilder would eat 160g of protein a day, but are all grams of protein created equal? Does it matter if you get your 160 grams of protein from chicken breast or nuts? It makes a HUGE difference! As explained below, a gram of protein from chicken breast is much better at building muscle than a gram of protein from nuts because of protein density, amino acid profile and digestibility. For over 8000 foods, this calculator tells you how much you need to eat to get the protein you need to build muscle.