How Much Protein Do You Need to Build Muscle?
Protein is the raw material your body uses to repair and build muscle after training. Eat too little and progress stalls no matter how hard you lift. So how much do you actually need?
The evidence-based target
For building muscle, research supports roughly 1.6-2.2 grams of protein per kilogram of body weight per day. For an 80 kg person that is about 128-176 g per day. Going much higher rarely adds benefit.
Estimate your personal number with the Protein Calculator.
Does timing matter?
Total daily protein matters most, but spreading it across 3-4 meals of 20-40 g each supports muscle protein synthesis better than one large serving. A protein-rich meal within a few hours of training is a sensible habit, though the old "30-minute anabolic window" is far less strict than once believed.
Best protein sources
- Animal: chicken, turkey, lean beef, fish, eggs, Greek yogurt, milk
- Plant: tofu, tempeh, edamame, lentils, beans, seitan
- Supplements: whey or plant protein powder for convenience
Protein while cutting
When losing fat, keep protein at the higher end (around 2.0-2.2 g/kg). High protein preserves muscle in a calorie deficit and keeps you full. Pair it with resistance training to hold onto lean mass - track it with the Lean Body Mass Calculator.
Can you eat too much?
For healthy people, intakes above the target are generally safe but offer no extra muscle benefit and displace other nutrients. People with kidney disease should consult a doctor before going high-protein.