To gain weight as muscle rather than fat, most people need between 1.2 and 1.7 grams of protein per kilogram of body weight per day. For a 70 kg (154 lb) person, that works out to roughly 84 to 119 grams daily. This is significantly more than the standard recommendation of 0.8 grams per kilogram, which is designed for sedentary adults just trying to avoid deficiency, not for anyone actively trying to build mass.
But hitting a daily total is only part of the picture. How you spread that protein across meals, the quality of your protein sources, and your age all influence how effectively your body turns what you eat into new muscle tissue.
How to Calculate Your Daily Target
Start with your body weight in kilograms. If you only know pounds, divide by 2.2. Then multiply by 1.2 on the low end and 1.7 on the high end. That gives you the range recommended by Mayo Clinic for people who regularly lift weights or train for endurance events.
Where you land in that range depends on how hard you’re training and how new you are to it. Beginners who are lifting consistently can often build muscle toward the lower end because their bodies respond more dramatically to a new stimulus. Someone with years of training experience typically needs to push closer to 1.5 or 1.7 g/kg to keep making progress. Here are a few examples:
- 60 kg (132 lb) person: 72 to 102 g protein per day
- 80 kg (176 lb) person: 96 to 136 g protein per day
- 100 kg (220 lb) person: 120 to 170 g protein per day
For the average healthy person who isn’t an elite athlete, Harvard Health suggests keeping total protein intake at or below 2 g/kg of ideal body weight. Going above that doesn’t appear to build more muscle, and very high protein diets carry a higher risk of kidney stones.
Why Per-Meal Amounts Matter
Your body doesn’t stockpile protein the way it stores fat. When you eat protein, your muscles ramp up their repair and growth process, but that response has a ceiling. Research published in Clinical Nutrition found that eating 30 to 45 grams of protein per meal produced the strongest association with leg lean mass and strength. A landmark study using beef showed that 30 grams in a single sitting was enough to max out the muscle-building response, and eating more in that same meal didn’t add further benefit.
This means someone aiming for 120 grams a day is better off eating four meals with 30 grams each than cramming 60 grams into two meals. Spreading your intake across three to four eating occasions gives your muscles repeated signals to grow throughout the day, rather than one large signal followed by hours of nothing.
Not All Protein Sources Are Equal
What makes a protein source effective for muscle gain largely comes down to one amino acid: leucine. Leucine acts as the trigger that tells your muscles to start building new tissue. You need roughly 2.5 to 3 grams of leucine per meal to flip that switch effectively.
Whey protein is unusually rich in leucine, containing about 13 grams per 100 grams of protein. That means a standard 25-gram whey protein shake delivers around 3.25 grams of leucine, enough to hit the threshold on its own. Beef contains roughly 1.9 grams of leucine per 100 grams of meat, so a typical 150-gram (5 oz) serving gets you in the right range. Chicken, eggs, fish, and dairy are all solid options that deliver leucine in meaningful amounts.
Plant-based proteins generally contain less leucine per gram, which means you may need slightly larger portions or combinations to reach the same trigger point. This doesn’t make plant protein ineffective, but it does mean paying closer attention to portion sizes and mixing sources like legumes, tofu, and grains throughout the day.
Protein Needs Increase After 50
As you age, your muscles become less responsive to protein. This phenomenon, called anabolic resistance, means the same amount of protein that would trigger robust muscle growth in a 25-year-old produces a weaker response in a 60-year-old. The European Society for Clinical Nutrition and Metabolism recommends that healthy older adults consume at least 1.0 to 1.2 g/kg per day just to maintain muscle, with 1.2 to 1.5 g/kg for those with chronic illnesses.
Per-meal needs shift too. Younger adults max out their muscle-building response with about 20 grams of protein after exercise, but older adults need closer to 40 grams to achieve the same effect. A higher proportion of leucine is also required. If you’re over 50 and trying to gain weight as muscle, aiming for the upper end of the protein range and including a leucine-rich source at every meal makes a meaningful difference.
Protein Alone Won’t Make You Gain Weight
Protein provides the raw materials for muscle, but you also need a caloric surplus, meaning you eat more total calories than you burn. Without that surplus, your body doesn’t have the energy to build new tissue regardless of how much protein you consume. A modest surplus of 250 to 500 calories above your maintenance level is typically enough to support muscle growth without adding excessive fat.
Resistance training is the other non-negotiable piece. Eating extra protein without challenging your muscles just results in those calories being used for energy or stored as fat. Your muscles need a reason to grow, and that reason is progressive overload: gradually increasing the weight, volume, or intensity of your workouts over time. Protein feeds the process, but training starts it.
A Practical Daily Plan
If you weigh 75 kg (165 lb) and are lifting weights three to four times per week, a reasonable daily protein target is around 112 grams (1.5 g/kg). Spread across four meals, that’s about 28 grams per meal. In practical terms, that looks like:
- Breakfast: Three eggs with a cup of Greek yogurt (roughly 30 g protein)
- Lunch: 150 g chicken breast with rice and vegetables (roughly 35 g protein)
- Post-workout: A whey protein shake with milk (roughly 30 g protein)
- Dinner: 150 g salmon or beef with a side of lentils (roughly 35 g protein)
This totals around 130 grams, comfortably within the target range. If you find it hard to eat this much whole food, a protein shake or two can fill the gap without requiring you to force down another full meal. The key is consistency: hitting your protein target most days, distributing it across meals, and pairing it with a training program that gives your body a reason to use it.