How Much Protein Per Day to Build Muscle: Evidence-Based Targets

Why Protein Is the #1 Variable for Muscle Growth

Muscle is built through a tug-of-war between muscle protein synthesis (MPS) — the process of building new muscle tissue — and muscle protein breakdown (MPB) — the process of breaking it down. Net muscle gain happens only when synthesis consistently exceeds breakdown.

Resistance training triggers MPS powerfully, but without enough dietary protein to supply amino acids as raw material, the signal goes nowhere. Think of it like a construction crew showing up to a job site with no bricks.

Critically, protein intake operates more like a threshold than a ladder. Once you clear the optimal range, eating dramatically more protein does not produce dramatically more muscle. This is why finding your personal target matters — you want enough to fully unlock muscle growth, not so much that you're just spending money on extra protein powder.

How Much Protein Per Day Do You Actually Need to Build Muscle?

The current evidence-backed range is 1.6–2.2 g of protein per kilogram of body weight per day, or approximately 0.7–1.0 g per pound. This range comes from multiple systematic reviews and meta-analyses examining protein intake and muscle gain in resistance-trained adults.

The popular "1 gram per pound" rule (roughly 2.2 g/kg) sits at the very top of this range. It is not wrong, but it is likely an overestimate for most people — particularly those who are newer to training. Research suggests the lower end of the range (around 1.6 g/kg) is sufficient to maximize muscle protein synthesis for many lifters, while the upper end provides a practical safety margin.

Exceeding 2.2 g/kg does not appear to cause harm in healthy people, but the additional protein is largely oxidized for energy rather than channeled into new muscle tissue. Put simply: beyond that point, the extra grams stop paying muscle-building dividends for most people.

What the Research Actually Says

The International Society of Sports Nutrition (ISSN) recommends that exercising individuals consume 1.4–2.0 g of protein per kg per day to support muscle building and recovery, with evidence supporting intakes up to 3.1 g/kg in certain fat-loss contexts. A landmark 2018 systematic review and meta-analysis by Morton and colleagues — analyzing data from 49 studies and 1,800 participants — found that protein supplementation significantly increased muscle mass gains from resistance training, with benefits plateauing at approximately 1.62 g/kg/day on average. Individual variation exists, which is why the practical target extends up to 2.2 g/kg rather than stopping at the average.

Your Personal Daily Protein Target by Body Weight

Use the table below to find your target range based on body weight. The 2.0 g/kg column is the practical daily target for most active people; treat 1.6 g/kg as your floor and 2.2 g/kg as your ceiling.

How to calculate your number in two steps: (1) Convert your body weight to kilograms if needed (pounds ÷ 2.2). (2) Multiply by 1.6 for your minimum and by 2.2 for your upper limit. Pick a number in that range and hit it consistently every day.

Should You Use Total Body Weight or Lean Mass?

For most people, total body weight is fine to use. Fat tissue has essentially zero protein requirements compared to muscle and organs, so technically protein needs track lean body mass more closely. However, calculating lean mass requires knowing your body fat percentage, which adds unnecessary complexity for most gym-goers.

The exception: if you are significantly overweight — roughly above 25% body fat for men or 35% for women — using total body weight will inflate your target. In that case, estimate your lean mass (body weight × (1 − body fat %)) and apply the same 1.6–2.2 g/kg multiplier to that number instead.

Does It Matter How You Spread Protein Throughout the Day?

Yes — distribution matters, though total daily intake is still the most important variable. Research suggests that each meal can meaningfully stimulate MPS up to approximately 0.4 g of protein per kg of body weight, which for a 75 kg person works out to about 30 g per meal. Beyond that dose per sitting, the additional protein in that meal contributes less to immediate MPS.

A practical target: aim for 3–5 meals or snacks per day, each containing 30–50 g of protein. This distributes your amino acid delivery evenly across the day and repeatedly triggers MPS rather than relying on one or two large protein hits.

The leucine threshold concept is relevant here. Leucine, one of the three branched-chain amino acids (BCAAs), acts as the key trigger for MPS. Each protein-containing meal needs to deliver roughly 2–3 g of leucine to fully activate the MPS signal. Animal proteins (chicken, eggs, dairy, fish) and soy tend to be leucine-rich; some plant proteins require larger portions to hit the same threshold.

Does Pre- or Post-Workout Protein Timing Matter?

The "anabolic window" — the idea that you must consume protein within 30 minutes of training or gains are lost — has been largely overstated. More recent evidence suggests the window is much wider, likely several hours on either side of a training session.

The practical takeaway: make sure you eat a protein-containing meal within roughly 2 hours before or after your workout. If you trained at noon and won't eat until 4 pm, that's a longer gap than ideal — but it won't erase your session. Total daily protein intake remains the dominant factor.

Is 100 g, 150 g, or 200 g of Protein Per Day Enough?

Here's a direct answer for each common benchmark, tied back to the table above:

100 g/day: Adequate if you weigh around 60–65 kg (130–145 lbs) and are newer to lifting. For anyone heavier or more advanced, 100 g/day likely falls short of the 1.6 g/kg minimum and may limit muscle-building results.

150 g/day: This hits the 2.0 g/kg target for someone weighing 75 kg (165 lbs) and is sufficient for most men and women in the 65–90 kg range training 3–5 days per week. For the majority of gym-goers, 150 g/day is a solid, practical goal.

200 g/day: This approaches or exceeds the upper range for most people. A 90 kg (200 lb) person would land at exactly 2.2 g/kg — right at the evidence-based ceiling. If you weigh significantly less than 90 kg, 200 g/day is probably more protein than you need to maximize muscle growth, though it is not harmful. Your money might be better spent elsewhere.

Is 2 Eggs a Day Enough Protein to Build Muscle?

No — not even close. Two large eggs provide roughly 12–13 g of protein combined. Even for the lightest individuals in our table (50 kg), the daily target is 80–110 g. Two eggs cover about 12–15% of that requirement at most.

Eggs deserve their reputation as a high-quality protein source. They contain all nine essential amino acids and score extremely well on protein quality indices. The issue is simply volume: you would need 12–15 eggs to approach a meaningful muscle-building protein intake from eggs alone, which is impractical for most people.

What does a realistic, protein-rich day look like? Here is a sample day for a 75 kg person targeting 150 g of protein:

• Breakfast: 4 scrambled eggs + 1 cup Greek yogurt — ~42 g protein
• Lunch: 150 g canned tuna + whole-grain wrap + vegetables — ~38 g protein
• Post-workout snack: 1 scoop whey protein in milk — ~35 g protein
• Dinner: 150 g grilled chicken breast + side of lentils — ~45 g protein
• Total: ~160 g protein

Animal proteins (chicken, turkey, fish, eggs, dairy) are generally the most efficient sources per calorie. Plant-based eaters can absolutely hit their targets with tofu, tempeh, legumes, edamame, and seitan — but may need to increase total intake by 10–20% to account for lower digestibility scores (measured by the Digestible Indispensable Amino Acid Score, or DIAAS) in some plant proteins.

Special Scenarios: When Do Protein Needs Change?

The 1.6–2.2 g/kg range applies well to most people in a maintenance or slight caloric surplus. Several situations push those numbers higher or change the approach:

Cutting (caloric deficit): When eating below maintenance calories, protein needs increase significantly — research by Helms and colleagues suggests ranges of 2.3–3.1 g/kg of lean body mass during aggressive cuts. Higher protein intake helps preserve muscle tissue when overall calories are restricted. This is one of the most consistent findings in sports nutrition research.

Beginners vs. advanced lifters: Complete beginners can make meaningful muscle gains at the lower end of the range (around 1.6 g/kg) because their muscles are highly responsive to the training stimulus. Advanced lifters, who are already closer to their genetic ceiling for muscle mass, typically benefit from sitting closer to 2.0–2.2 g/kg.

Older adults (40+): Muscle protein synthesis becomes less efficient with age — a phenomenon called anabolic resistance. Research suggests older adults benefit from targeting the higher end of the range, around 1.8–2.2 g/kg per day, and from prioritizing leucine-rich protein sources (dairy, eggs, meat) to overcome the blunted MPS response.

Plant-based dieters: Most plant proteins have lower digestibility and often a less complete amino acid profile compared to animal proteins. As a practical adjustment, plant-based athletes can add 10–20% to their total daily protein target to ensure they meet their effective amino acid requirements.

Frequently Asked Questions

See the FAQ section below for answers to the most common questions about daily protein intake for muscle building.