Most people need 1.4 to 2.0 grams of protein per kilogram of body weight per day to build muscle effectively. For a 180-pound (82 kg) person, that works out to roughly 115 to 164 grams of protein daily. The exact number depends on your training intensity, age, and whether you’re also trying to lose fat.
The Daily Target in Grams
The International Society of Sports Nutrition puts the range at 1.4 to 2.0 grams per kilogram of body weight per day for people who exercise regularly. Mayo Clinic narrows this slightly to 1.2 to 1.7 grams per kilogram for people who lift weights or train for endurance events. The overlap between these recommendations sits at about 1.4 to 1.7 g/kg, which is a solid target for most lifters.
To find your number, convert your body weight to kilograms (divide pounds by 2.2), then multiply by 1.4 on the low end and 2.0 on the high end. Here’s what that looks like at common body weights:
- 150 lbs (68 kg): 95 to 136 grams per day
- 180 lbs (82 kg): 115 to 164 grams per day
- 200 lbs (91 kg): 127 to 182 grams per day
- 220 lbs (100 kg): 140 to 200 grams per day
If you’re newer to lifting, the lower end of the range is likely sufficient. If you’re training hard four or more days a week and pushing for noticeable size gains, aim closer to the upper end.
How Much Protein Per Meal Actually Counts
Your body can only use so much protein at once to build muscle. Research on healthy adults found that roughly 30 grams of protein in a single meal is enough to maximally stimulate muscle building. A study using beef as the protein source showed that eating more than 30 grams in one sitting didn’t produce any additional muscle-building response. The ISSN recommends aiming for 0.25 grams per kilogram of body weight per meal, which translates to about 20 to 40 grams depending on your size.
This means spreading your protein across the day matters more than hitting a massive number in one or two meals. Eating every 3 to 4 hours, with a protein-rich food at each sitting, gives your muscles repeated opportunities to build new tissue. Four meals of 35 to 40 grams will outperform two meals of 70 grams for muscle growth, even though the daily total is similar.
Each of those protein servings should contain around 700 to 3,000 milligrams of leucine, an amino acid that acts as the trigger for muscle building at the cellular level. Most animal proteins hit this threshold naturally at a 30-gram serving. If you eat mostly plant proteins, combining sources (rice and beans, tofu with grains) helps you reach that leucine level.
A Protein Snack Before Bed Helps
Eating 30 to 40 grams of a slow-digesting protein before sleep increases overnight muscle building and raises your metabolic rate without interfering with fat burning. Casein, the primary protein in cottage cheese and Greek yogurt, digests slowly enough to feed your muscles through the night. This is one of the simplest ways to add a productive protein dose to your day without changing your regular meals.
Plant Protein Builds Muscle Just as Well
Whether your protein comes from chicken, whey, lentils, or tofu doesn’t change the fundamental outcome. Plant proteins build muscle just as effectively as animal proteins when total daily intake is adequate. The recommendation for plant-based eaters falls in the same range: 1.2 to 1.6 grams per kilogram per day.
The practical challenge with plant proteins is volume. You need to eat more food to hit the same protein numbers because plant sources carry more carbohydrates and fiber alongside their protein. A chicken breast delivers about 31 grams of protein in 140 calories. Getting 31 grams from black beans requires eating roughly two cups, which comes with over 400 calories. This isn’t a problem for muscle gain (extra calories help), but it means planning meals more deliberately. Combining different plant sources throughout the day ensures you get the full range of amino acids your muscles need.
Adjustments for Age
Adults over 60 face a biological challenge called anabolic resistance: their muscles respond less efficiently to the same amount of protein that works for younger people. The fix is straightforward. Older adults benefit from eating more protein per meal and choosing proteins that digest quickly and contain higher amounts of leucine. Practically, this means aiming for the higher end of the 1.4 to 2.0 g/kg range rather than the lower end, and making sure each meal contains at least 30 to 40 grams of high-quality protein rather than 20.
Resistance training is especially important for older adults because it sensitizes muscles to protein. A lifting session performed before a protein-rich meal dramatically improves how much of that protein actually goes toward building and maintaining muscle tissue.
When You’re Cutting Fat
If you’re eating in a calorie deficit to lose fat, your protein needs actually go up, not down. Keeping protein at 1.0 to 1.2 grams per kilogram helps preserve the muscle you already have while your body burns fat for energy. However, for someone who is actively lifting and wants to both lose fat and maintain (or even build) muscle, there’s evidence that going higher, above 2.0 g/kg, helps with body composition. ISSN research suggests intakes above 3.0 g/kg per day may promote fat loss in resistance-trained individuals, though that level of intake is difficult to sustain and unnecessary for most people.
The key takeaway during a cut: don’t drop protein to make room for other calories. If anything, protein should be the last macronutrient you reduce.
Is There a Safety Limit?
High-protein diets are not known to cause medical problems in people with healthy kidneys. The concern about protein damaging kidneys comes from studies on people who already have kidney disease, where the extra waste products from protein breakdown can worsen kidney function. If your kidneys are healthy, intakes of 2.0 g/kg per day or even higher are well-tolerated.
The most common side effects of significantly increasing protein intake are digestive: bloating, gas, or feeling overly full. These typically resolve within a week or two as your body adjusts. Drinking enough water and increasing protein gradually rather than all at once helps minimize discomfort.