Protein for Muscle Gain: Exact Daily Requirements
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For muscle gain, consume 1.6–2.2 g of protein per kg of body weight daily. For a 75 kg person, this means 120–165 g of protein per day. In the largest meta-analysis, the extra benefit levelled off at about 1.6 g/kg, with 2.2 g/kg covering most individuals; higher intakes are unlikely to add much muscle.
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For muscle gain, consume 1.6–2.2 g of protein per kg of body weight daily. For a 💪 — calculated at snapbodycalc.com
The Science: How Much Protein Builds Muscle?
The most comprehensive meta-analysis on protein and muscle gain (Morton et al., 2018, British Journal of Sports Medicine) analyzed 49 studies with 1,863 participants and concluded that extra protein increased gains in fat-free mass during resistance training, with the benefit plateauing at about 1.6 g/kg/day; the upper bound of the 95% confidence interval was about 2.2 g/kg/day, which is why 2.2 g/kg is often used to cover people who respond at the high end. The effects were modest compared with the effect of training itself. The International Society of Sports Nutrition (ISSN, 2017) position stand recommends 1.4–2.0 g/kg/day for most exercising individuals, and higher intakes during energy restriction in lean, resistance-trained people.
Protein Needs by Body Weight: Quick Reference
Here's what the 1.6–2.2 g/kg recommendation looks like at common body weights. At 60 kg: 96–132 g protein daily. At 70 kg: 112–154 g protein daily. At 80 kg: 128–176 g protein daily. At 90 kg: 144–198 g protein daily. At 100 kg: 160–220 g protein daily. If you're significantly overweight (BMI 30+), calculate protein based on lean body mass or target body weight rather than total weight to avoid unrealistically high targets. Our lean body mass calculator can estimate your fat-free mass, but there is no single agreed per-kg-of-lean-mass target, so a goal body weight is often the simpler reference.
Protein Timing: Does It Actually Matter?
The 'anabolic window' — the idea that you must consume protein within 30 minutes of training — has been largely debunked. What matters more is total daily protein intake distributed across 3–5 meals. The ISSN suggests roughly 20–40 g of protein per meal, spread every 3–4 hours, as a practical way to support muscle protein synthesis (MPS); evidence that a specific meal pattern produces more long-term muscle growth is weaker than the evidence for total daily intake. Some studies have tested a pre-sleep protein serving (about 30–40 g of casein), but it is an option, not a requirement.
Best Protein Sources for Muscle Building
Not all proteins are created equal for muscle growth. Complete proteins containing all essential amino acids — particularly leucine (the primary trigger for MPS) — are superior. Top sources include chicken breast (31 g protein per 100 g), lean beef (26 g per 100 g), eggs (6 g per egg, with the highest biological value), Greek yogurt (10 g per 100 g), whey protein (20–25 g per scoop), fish and seafood (20–25 g per 100 g), and cottage cheese (11 g per 100 g). Plant-based athletes can achieve adequate protein through combinations of legumes, tofu (17 g per 100 g), tempeh (19 g per 100 g), seitan (25 g per 100 g), and plant protein powders. The ISSN position stand mentions roughly 700–3,000 mg of leucine per meal; varied protein-rich meals usually provide this without special planning.
Protein During Cutting vs. Bulking
Protein needs shift based on whether you're in a caloric surplus or deficit. In a caloric surplus, about 1.6–2.2 g/kg is the range commonly cited. In a deficit, higher intakes — up to about 2.4 g/kg body weight in our calculator — are often recommended to help preserve lean mass. A systematic review by Helms et al. (2014) suggested 2.3–3.1 g per kg of lean body mass for lean, resistance-trained athletes during energy restriction; that figure is per kg of lean mass, not total body weight, and comes from a specific population. The practical takeaway: when dieting, keep protein at least as high as when maintaining, and keep resistance training.
Common Protein Mistakes That Limit Muscle Growth
The biggest mistake is simply not eating enough total protein — many people who train eat less than the 1.6 g/kg range associated with the best muscle gains. Other common issues include very uneven distribution (very little protein at breakfast and most at dinner), relying on a narrow range of plant proteins, and neglecting protein on rest days, when recovery continues. Ordinary food can cover most targets; a protein powder such as whey is simply a convenient, well-studied option when food alone falls short. Use our protein calculator to set your daily target, then track intake for 1–2 weeks to identify shortfalls.