Most people looking to gain weight through muscle need between 1.4 and 2.0 grams of protein per kilogram of body weight per day. For a 170-pound (77 kg) person, that works out to roughly 108 to 154 grams of protein daily. The exact number depends on your training intensity, age, and how much muscle you’re trying to build.
How to Calculate Your Target
The International Society of Sports Nutrition recommends 1.4 to 2.0 grams of protein per kilogram of body weight per day for people who exercise and want to build or maintain muscle. To find your number, divide your weight in pounds by 2.2 to get kilograms, then multiply by a value in that range. Someone weighing 200 pounds (91 kg) would aim for 127 to 182 grams daily.
Where you land in that range depends on how hard you’re training. If you’re doing moderate resistance training a few days a week, the lower end is likely sufficient. If you’re lifting heavy five or six days a week, pushing closer to 2.0 g/kg makes more sense. Some evidence even suggests that intakes above 3.0 g/kg per day can help resistance-trained individuals lose fat while gaining muscle, though most people don’t need to go that high.
Why Protein Alone Won’t Make You Gain Weight
Protein provides the raw material your muscles need to grow, but you also need a calorie surplus. Your body can’t build new tissue without extra energy. That means eating more total calories than you burn each day, with protein making up a significant share of those calories. If you hit your protein target but eat at maintenance or below, you’ll get stronger but likely won’t see meaningful weight gain.
A practical starting point is to eat 250 to 500 calories above your maintenance level, with protein accounting for roughly 25 to 35 percent of total intake. The remaining calories come from carbohydrates and fats, which fuel your workouts and support recovery.
How to Spread Protein Across the Day
Your body can only use so much protein at once for muscle building. Research from the Mayo Clinic Health System suggests aiming for 15 to 30 grams of protein at each meal. Intakes above 40 grams in a single sitting don’t appear to provide additional muscle-building benefits compared to that 15 to 30 gram range.
This means someone targeting 150 grams per day would do better splitting it across four or five eating occasions rather than loading 75 grams into two large meals. A pattern like 30 grams at breakfast, 30 at lunch, 30 at dinner, and 25 to 30 across snacks keeps your muscles supplied with a steady stream of the building blocks they need throughout the day.
Each of those protein doses should ideally come from high-quality sources. Your muscles respond to a specific amino acid called leucine, which acts as a trigger for muscle repair and growth. You need roughly 2 to 3 grams of leucine per meal to fully activate that process. Most animal proteins (chicken, eggs, fish, dairy) and some plant sources (soy, lentils combined with grains) hit that threshold in a standard serving.
Protein Needs Change With Age
Adults over 65 face a challenge called anabolic resistance, where muscles become less responsive to dietary protein. The gut absorbs amino acids less efficiently, blood flow to muscles after eating decreases, and the signaling pathways that trigger muscle growth become blunted. The practical result is that older adults need more protein to get the same muscle-building effect a younger person gets.
For healthy older adults, the European Society for Clinical Nutrition and Metabolism recommends at least 1.0 to 1.2 g/kg per day just to maintain muscle. Those dealing with illness or recovering from injury may need 1.2 to 1.5 g/kg or higher. Older adults also benefit from larger per-meal doses. While younger lifters max out their muscle-building response at about 20 grams per meal after exercise, older adults continue to see benefits with doses up to 40 grams.
Is High Protein Intake Safe?
A common concern is whether eating this much protein will strain your kidneys. For healthy people, it won’t. High-protein diets are not known to cause medical problems in individuals with normal kidney function, according to the Mayo Clinic. If you have existing kidney disease, the calculus is different, but for someone actively training and trying to gain weight, protein intakes in the 1.4 to 2.0 g/kg range are well within safe territory.
Digestive discomfort is the more realistic issue. Jumping from 60 grams a day to 150 overnight can cause bloating and fullness. Ramping up gradually over a week or two, and spreading intake across meals, usually solves this.
What This Looks Like in Real Food
Hitting your protein target is easier when you know the rough protein content of common foods. A chicken breast has about 30 grams. A cup of Greek yogurt has 15 to 20 grams. Two eggs provide around 12 grams. A scoop of whey protein powder delivers 20 to 25 grams. A can of tuna has about 25 grams. A cup of cooked lentils gives you 18 grams.
For someone aiming at 140 grams per day, a realistic day might look like: three eggs and toast at breakfast (18 g), a Greek yogurt with nuts as a morning snack (22 g), a chicken breast with rice and vegetables at lunch (35 g), a protein shake after a workout (25 g), and salmon with sweet potatoes at dinner (40 g). That gets you to 140 grams without any exotic foods or supplements beyond a single shake.
The key is consistency. Hitting your protein target for one day won’t do much. Muscle growth happens over weeks and months of steady training paired with steady nutrition. Track your intake for the first week or two until you develop a reliable sense of portion sizes, then let the habits carry you forward.