Protein Intake Calculator
Find your optimal daily protein intake based on body weight, activity level, and fitness goal. See grams per day, per meal, and percentage of total calories.
Quick Answer
Most adults need 0.6-1.2 grams of protein per pound of body weight daily, depending on activity level and goals. Building muscle or losing fat while preserving muscle both require the higher end — around 0.8-1.0 g/lb.
Muscle gain & strength
Used to calculate protein as % of calories
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About This Tool
Protein is the most critical macronutrient for body composition, whether you are trying to build muscle, lose fat, or simply maintain your current physique. Unlike carbohydrates and fats, protein serves a primarily structural role — it is the building block of muscle tissue, enzymes, hormones, and immune cells. Your body cannot store excess protein the way it stores fat or glycogen, which means you need a consistent daily supply to support repair, growth, and metabolic function.
The Recommended Dietary Allowance (RDA) for protein is 0.36 grams per pound of body weight (0.8 g/kg), but this figure represents the minimum to prevent deficiency in sedentary adults — not the optimal amount for active individuals or anyone with body composition goals. Research over the past two decades has consistently shown that higher protein intakes, in the range of 0.7-1.2 grams per pound, produce superior outcomes for muscle gain, fat loss, satiety, and metabolic health.
Protein for Muscle Building
The muscle protein synthesis (MPS) response to resistance training is maximized at protein intakes of 0.7-1.0 grams per pound of body weight in most studies. A landmark 2018 meta-analysis by Morton et al. in the British Journal of Sports Medicine found that protein intake above 0.73 g/lb (1.6 g/kg) did not further enhance muscle gains in resistance-trained individuals, though intakes up to 1.0 g/lb may provide a small additional benefit during aggressive training programs. The key is distributing protein across 3-5 meals per day with 25-40 grams per meal to maximize the MPS response at each feeding.
Protein for Fat Loss
During a calorie deficit, higher protein intake becomes even more important. A 2016 study by Longland et al. found that subjects eating 1.1 g/lb (2.4 g/kg) of protein during an aggressive deficit gained muscle while losing fat, compared to a lower-protein group that only maintained lean mass. Protein preserves muscle during weight loss through two mechanisms: it provides amino acids for muscle repair, and it has the highest thermic effect of any macronutrient — your body burns roughly 20-30% of protein calories just digesting and processing them, compared to 5-10% for carbs and 0-3% for fats.
Protein Distribution and Timing
Research shows that distributing protein evenly across meals produces better muscle protein synthesis than consuming the same total amount in one or two large servings. The leucine threshold — the amount of the amino acid leucine needed to maximally stimulate MPS — is approximately 2.5-3 grams, which corresponds to about 25-40 grams of high-quality protein per meal depending on the source. Animal proteins (meat, fish, eggs, dairy) have higher leucine content than plant proteins, so vegans may need slightly higher total protein or targeted leucine supplementation.
High-Protein Food Sources
The best protein sources provide high bioavailability and a complete amino acid profile. Chicken breast provides about 31 grams of protein per 100 grams. Greek yogurt provides 10-17 grams per serving depending on brand. Eggs provide 6 grams each with near-perfect amino acid composition. Whey protein powder provides 20-30 grams per scoop and is rapidly absorbed. Lean beef provides 26 grams per 100 grams along with creatine, iron, and B12. For plant-based sources, tofu (17g per cup), lentils (18g per cup cooked), and tempeh (31g per cup) are among the best options.
Special Populations
Older adults (over 65) should aim for the higher end of protein recommendations — at least 0.5-0.7 g/lb — because aging reduces the MPS response to protein intake, a phenomenon called anabolic resistance. Pregnant and breastfeeding women need an additional 25 grams per day above baseline. People with chronic kidney disease should consult their physician before increasing protein intake, as high protein loads can accelerate kidney decline in those with pre-existing impairment. For healthy individuals with normal kidney function, there is no evidence that high protein diets cause kidney damage — a conclusion supported by multiple systematic reviews.