If you are training hard but not seeing muscle growth, you might ask: how much protein per day to build muscle? The answer is not a random number – it depends on your body weight, activity level, and goals. Before calculating your protein target, get your BMR from our BMR calculator – this baseline helps you plan total calories.
Why Protein Is Crucial for Muscle Gain
Muscle tissue is made of protein. When you lift weights, you create tiny tears in muscle fibres. Your body then repairs these tears using amino acids from dietary protein. Without enough protein, repair is incomplete, and muscle growth stalls.
Consequently, protein is the most important macronutrient for anyone wanting to build mass. However, eating excessive protein beyond a certain point provides no extra benefit. Therefore, you need a target range, not an unlimited amount.
The Science‑Based Recommendation
Decades of research have established a clear range for muscle protein synthesis.
For building muscle:
- 1.6 to 2.2 grams of protein per kilogram of body weight per day
This range works for most people, from beginners to advanced lifters.
| Body Weight (kg) | Protein Target (1.6 g/kg) | Protein Target (2.2 g/kg) |
|---|---|---|
| 50 kg | 80 g | 110 g |
| 60 kg | 96 g | 132 g |
| 70 kg | 112 g | 154 g |
| 80 kg | 128 g | 176 g |
| 90 kg | 144 g | 198 g |
| 100 kg | 160 g | 220 g |
For example, a 75 kg male needs between 120g and 165g of protein daily. Start at 1.8 g/kg (135g) as a middle ground.
How Much Protein Per Day to Build Muscle Compared to Other Goals
It is helpful to see how muscle‑building protein needs differ from other phases.
| Goal | Protein per kg body weight |
|---|---|
| Sedentary maintenance | 0.8‑1.0 g/kg |
| Weight loss (preserving muscle) | 1.6‑2.4 g/kg |
| Muscle gain (bulking) | 1.6‑2.2 g/kg |
| Very high volume training | up to 2.5 g/kg |
Thus, how much protein per day to build muscle sits in the same range as weight loss preservation. However, during a calorie surplus, you may not need the very top end unless you are lean and experienced.
Step 1: Calculate Your Personal Number
Use the formula: body weight in kg × 1.8 (middle of the range).
Example: 70 kg female → 70 × 1.8 = 126 grams of protein per day
Then decide your calorie surplus for muscle gain. For a complete understanding of calorie needs, read our guide on how many calories to build muscle – protein works together with total energy.
Step 2: Spread Protein Across Meals
Research shows that muscle protein synthesis is stimulated optimally with 20‑40 grams of protein per meal, spaced every 3‑4 hours.
Sample schedule (126g target):
- Breakfast: 30g (3 eggs + Greek yogurt)
- Lunch: 35g (chicken breast + quinoa)
- Afternoon snack: 25g (protein shake)
- Dinner: 36g (salmon + lentils)
Total: 126g. Spreading intake is more effective than eating most of your protein in one meal. Therefore, aim for 3‑5 protein‑rich feedings per day.
Step 3: Choose High‑Quality Protein Sources
Not all protein is equal. Animal sources are complete (contain all essential amino acids). Plant sources can be combined.
Excellent sources (grams of protein per serving):
- Chicken breast (100g): 31g
- Lean beef (100g): 26g
- Fish (salmon, tuna, 100g): 22‑25g
- Eggs (2 large): 12g
- Greek yogurt (200g): 20g
- Cottage cheese (200g): 22g
- Tofu (150g): 18g
- Lentils (1 cup cooked): 18g
- Protein powder (1 scoop): 20‑25g
For vegetarians or vegans, combine legumes with grains (rice + beans, peanut butter on whole wheat) to ensure a full amino acid profile.
Step 4: Adjust for Weight Loss vs. Muscle Gain
If you are trying to build muscle, you are likely in a calorie surplus. Consequently, hitting your protein target is easier because you have more total calories. Nevertheless, do not neglect protein timing.
During a cutting phase (weight loss while preserving muscle), protein needs may be slightly higher – up to 2.2‑2.4 g/kg. This helps offset muscle breakdown. For a detailed comparison, see our how many calories to eat to lose weight guide, which emphasises protein during deficits.
Real‑World Example: 80 kg Male Building Muscle
Let’s apply the principles.
Person: 80 kg male, 180 cm, training 4x per week
- BMR ~1,780 calories/day (from our BMR calculator)
- TDEE (moderately active) ~2,760 calories/day
- Surplus +300 → 3,060 calories/day
- Protein target (1.8 g/kg) → 144g per day
He plans his meals:
- Breakfast: 4 eggs + oatmeal with milk (40g protein)
- Lunch: 200g chicken breast + rice (62g)
- Dinner: 150g salmon + quinoa (34g)
- Snack: Greek yogurt (20g)
Total: 156g – slightly above target, which is fine. He spreads meals evenly and trains progressively.
After 8 weeks, he gains 1.5 kg of lean mass with minimal fat. His strength increases, confirming his protein and calorie surplus are correct.
For help with fine‑tuning the surplus, see our maintenance calories guide – then add 200‑400 calories.
Common Mistakes About Protein for Muscle Gain
❌ Eating too much protein – Over 2.5 g/kg provides no extra muscle benefit. Excess protein is either used for energy or stored as fat (if calories are excessive). Additionally, very high intakes may cause digestive discomfort.
❌ Relying only on shakes – Whole foods provide micronutrients and satiety. Use supplements for convenience, not as the primary source.
❌ Skipping protein after workouts – The post‑workout window (1‑2 hours) is important but not magical. Nevertheless, having a protein‑rich meal after training supports recovery.
❌ Ignoring total calories – You can eat 200g of protein but still fail to gain muscle if you are not in a calorie surplus. Therefore, protein alone is insufficient. See our TDEE calculator to plan total intake.
❌ Not adjusting for weight changes – As you gain weight, recalculate your protein target every 5‑7 kg. Your needs increase with body size.
How to Track Protein Intake
- Use a food diary app (MyFitnessPal, Cronometer) for a few weeks until you can estimate portion sizes.
- Weigh protein sources (meat, fish, tofu) at least occasionally.
- Read labels – many packaged foods have surprising amounts of protein.
If you struggle to meet your target, add a protein shake or increase portion sizes of meat/dairy.
Frequently Asked Questions
Can I build muscle on a plant‑based diet?
Yes, absolutely. Combine complementary proteins (rice + beans, hummus + pita) and consider a vegan protein powder if needed. The same protein target applies.
Do I need protein immediately after a workout?
The “anabolic window” is wider than once thought – up to 2‑3 hours post‑workout. Nevertheless, sooner is better. A shake or meal within 2 hours is ideal.
Does protein intake affect metabolism?
Yes. Protein has a higher thermic effect of food (20‑30%) than carbs (5‑10%) or fat (0‑3%). Thus, eating protein can slightly boost daily energy expenditure. Learn more in how to increase metabolism naturally .
Can I eat too much protein? Is it dangerous?
For healthy individuals, protein up to 2.5 g/kg is considered safe. However, those with pre‑existing kidney disease should consult a doctor. Otherwise, no evidence of harm.
Is protein timing important for intermittent fasting?
Yes. During a restricted eating window, you must still consume enough total protein. Spread it across 2‑4 meals. Read our intermittent fasting beginner’s guide for strategies to meet protein goals while fasting.
What is the difference between BMR and RMR? Does that affect protein needs?
No, protein needs are based on body weight, not metabolic rate. However, knowing your BMR helps set calorie targets. For the distinction, see BMR vs. RMR .