112
g/day
37
g
28
g
112
g/day
37
g
28
g
Protein is the most essential macronutrient for body composition. It provides the amino acid building blocks for muscle repair and synthesis, supports immune function, produces enzymes and hormones, and provides sustained satiety that helps manage caloric intake. Getting the right amount of protein daily is critical whether you are trying to build muscle, lose fat while preserving lean mass, or simply maintain overall health.
Protein requirements vary significantly based on activity level and goals. The Recommended Dietary Allowance (RDA) of 0.36 g per pound of body weight (0.8 g/kg) is the minimum needed to prevent deficiency in sedentary adults — but this is far below what research suggests is optimal for active individuals. Those who exercise regularly, particularly with resistance training, benefit from intakes of 0.7–1.0 g per pound, which maximizes muscle protein synthesis and minimizes muscle breakdown during calorie deficits.
This calculator provides a practical daily protein target and breaks it down into per-meal portions, since research on muscle protein synthesis shows that distributing protein across 3–5 meals of 25–40g each maximizes anabolic response compared to consuming the same total in one or two large meals. High-quality protein sources include lean meats, poultry, fish, eggs, dairy, legumes, and protein supplements.
Daily protein requirement is estimated by multiplying body weight by an activity-based factor:
$$Protein\ (g) = W_{lbs} \times F$$
Where $$F$$ is the activity factor: 0.36 g/lb for sedentary adults (equivalent to the RDA of 0.8 g/kg), 0.5 g/lb for moderately active individuals, 0.7 g/lb for those who regularly engage in strength training, and 0.9 g/lb for competitive athletes with heavy training loads. These values are derived from nitrogen balance studies and muscle protein synthesis research. Per-meal targets are simply the daily total divided by 3 or 4 equal meals.
Meeting your daily protein target is more important than the precise timing of meals, though spreading intake across 3–5 meals is beneficial for muscle protein synthesis. During a caloric deficit, maintaining high protein intake (0.7–1.0 g/lb) is particularly important to prevent muscle loss. If you find it difficult to meet protein goals through food alone, high-quality protein supplements (whey, casein, pea protein) are a convenient and evidence-backed option. Excess protein above your needs is not harmful for healthy individuals with normal kidney function but provides no additional muscle-building benefit.
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A 175 lb male who lifts weights regularly should target 123g of protein daily, or about 41g per meal in a 3-meal plan.
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A sedentary 140 lb woman needs approximately 50g/day at the RDA minimum — easy to achieve with two servings of high-protein foods.
For healthy adults with normal kidney function, high protein intake (up to 1.6 g/lb of body weight) appears safe based on current research. The concern about protein and kidney damage applies primarily to individuals with pre-existing kidney disease, not healthy people. Excess protein beyond what is used for tissue synthesis and energy is simply oxidized for energy or stored as fat — it does not provide additional muscle-building benefits.
The best protein sources are those with complete amino acid profiles and high biological value. Top animal sources include chicken breast (31g/100g), tuna (30g/100g), eggs (13g/100g), Greek yogurt (17g/100g), and cottage cheese (11g/100g). Top plant sources include tempeh (19g/100g), edamame (11g/100g), lentils (9g/100g), and quinoa (4g/100g). Combining diverse plant sources ensures all essential amino acids are consumed.
Protein timing has some importance, but total daily intake is the primary driver of muscle adaptation. Consuming protein within 1–2 hours after resistance training can modestly enhance muscle protein synthesis. Consuming 30–40g of casein protein before bed may also support overnight muscle repair. However, if you are consistently meeting your daily target, optimal timing provides only a marginal additional benefit.
Yes. Sarcopenia (age-related muscle loss) means older adults (60+) benefit from higher protein intake than the standard RDA suggests — typically 0.5–0.7 g/lb even without significant exercise. Adequate protein combined with resistance training is one of the most effective strategies for preserving muscle mass and functional independence in older adults.
Insufficient protein leads to muscle catabolism (breakdown) as the body breaks down muscle tissue to supply amino acids for essential functions. Signs of low protein intake include muscle weakness, slow recovery from exercise, hair thinning, impaired immune function, and slower wound healing. During calorie restriction, low protein intake dramatically increases the proportion of weight lost from muscle versus fat.
Protein supplements are not necessary if you can meet your protein needs through whole foods. However, for many active individuals, protein supplements offer a convenient, cost-effective way to reach daily targets — particularly post-workout when appetite may be suppressed. Whey protein has the highest biological value and fastest absorption rate; casein is best for sustained release; pea and rice protein are quality plant-based options.
Roboculator Team
The Roboculator Team explains calculations, planning tools, and practical formulas in clear language for real-life situations.
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