How Much Protein Do You Really Need to Build Muscle?

Protein is the most talked-about nutrient in fitness, and also the most misunderstood. Here's what the actual numbers look like, without the supplement-industry noise.

Why Protein Matters for Muscle Growth

Muscle tissue is built from protein. When you strength train, you create small amounts of muscle fiber damage, and protein supplies the amino acids your body uses to repair and rebuild that tissue slightly stronger than before. Without adequate protein intake, that repair-and-grow cycle simply can't happen efficiently, no matter how hard your training sessions are.

How Much Protein You Actually Need

Daily protein intake is the amount of protein, in grams, your body needs each day to maintain, repair, and build muscle tissue, and requirements scale with body weight and training intensity. General guidelines suggest:

• 0.8g per kg of body weight for sedentary adults — the baseline to maintain general health
• 1.6–2.2g per kg of body weight for people actively strength training and aiming to build muscle

That's a meaningful jump. A 70kg sedentary adult needs roughly 56g of protein daily; a 70kg adult training seriously for muscle gain may need anywhere from 112g to 154g — double or more.

Timing and Distribution

How you spread protein across the day matters almost as much as the total amount. Spreading protein intake across multiple meals supports better muscle protein synthesis than eating one large protein-heavy meal and little else the rest of the day. Aiming for a moderate serving of protein at each meal — rather than saving it all for dinner — tends to produce better results.

Calculate Your Target

Rather than doing the math by hand, use our free protein calculator — enter your weight and training goal, and get a personalized daily gram target in seconds. It's a much more useful number to plan meals around than a generic internet rule of thumb.