How Much Protein Per Day to Build Muscle?
Protein is the one macronutrient almost everyone agrees matters for building muscle — and the one whose amount is argued about the most. The good news: research converges on a fairly clear range. Here's how much protein per day actually supports muscle growth, and how to hit that number with real meals.
The Evidence-Based Range: 1.6–2.2 g per kg of Body Weight
For people who train with weights and want to build muscle, research points to a daily intake between 1.6 and 2.2 grams of protein per kilogram of body weight (roughly 0.7–1 g per pound).
Meta-analyses that pooled dozens of resistance-training studies observed that the benefits of additional protein for muscle growth largely plateau around 1.6 g/kg/day — that number works well as the floor of an effective target. Going up to about 2.2 g/kg acts as a practical ceiling: some individuals may see small extra benefits in specific situations, but beyond that point more protein does not reliably translate into more muscle.
In practice: an 80 kg (176 lb) person aiming for hypertrophy would target roughly 128–176 g of protein per day. Anywhere inside the range is a good place to be — precision beyond that matters far less than consistency.
Protein Targets by Goal
Your ideal intake shifts with your goal and your energy balance. Use the table below as a starting point:
| Goal | g per kg/day | Example: 80 kg |
|---|---|---|
| Maintenance / general health | 1.2–1.6 | 96–128 g |
| Muscle gain (hypertrophy) | 1.6–2.2 | 128–176 g |
| Cutting (losing fat, keeping muscle) | 1.8–2.7 | 144–216 g |
Why is the cutting range higher? In a calorie deficit, your body is more prone to breaking down muscle tissue for energy. A higher protein intake — combined with resistance training — is one of the best-supported tools for holding on to lean mass while losing fat.
Protein targets only make sense in the context of your total energy intake. If you don't know your maintenance calories yet, calculate your TDEE with our calorie calculator — and if you want a quick reference point for your body weight, our BMI calculator takes a few seconds.
How to Distribute Protein Across Meals
Total daily intake is what matters most, but distribution helps. Research on muscle protein synthesis suggests that doses of roughly 20–40 g of protein per meal are enough to strongly stimulate muscle building — with larger bodies and whole-body sessions sitting at the higher end.
A simple pattern that works for most people: 3–5 meals per day, each containing 20–40 g of protein. For our 80 kg example targeting 160 g, that could be four meals of about 40 g each — breakfast, lunch, post-workout, and dinner.
The Best Protein Sources
Animal sources — chicken, lean beef, fish, eggs, Greek yogurt, cottage cheese, whey protein — are complete proteins, rich in leucine, the essential amino acid that triggers muscle protein synthesis.
Plant sources — tofu, tempeh, lentils, chickpeas, black beans, edamame, seitan, soy or pea protein powder — can absolutely support muscle growth too. Because most plant proteins are lower in leucine, plant-based lifters benefit from slightly larger portions and from combining different sources across the day.
Common Protein Myths
"High protein damages your kidneys." Studies in healthy people have not shown that protein intakes in the ranges above harm kidney function. This concern comes from research on people with pre-existing kidney disease — a different situation. If you have a kidney condition, talk to your doctor before increasing protein.
"You must drink a shake within 30 minutes of training." The famous "anabolic window" is far less rigid than gym folklore suggests. What the evidence supports: your total daily protein, plus a protein-containing meal within a few hours around your workout. If you trained fasted, eating sooner is more relevant — but nothing magical disappears at minute 31.
"More protein always means more muscle." Past the ranges above, extra protein is mostly just extra calories. Muscle growth is capped by training stimulus, recovery, and genetics — not by how much powder fits in your shaker.
The Bottom Line
Aim for 1.6–2.2 g of protein per kg of body weight per day when building muscle, closer to 1.8–2.7 g/kg when cutting, spread over 3–5 meals of 20–40 g each, coming mostly from whole foods you enjoy eating.
Then give it time. Protein does not build muscle by itself — consistent training and adequate calories do the heavy lifting. The number on the label matters much less than the weeks of consistency behind it.