The Short Answer
Most active adults trying to build muscle do well eating about 1.4 to 2.0 grams of protein per kilogram of body weight per day (roughly 0.64 to 0.9 grams per pound). That range comes from the International Society of Sports Nutrition’s position stand on protein and exercise. A widely cited meta-analysis found that the added benefit for muscle gain tends to level off around 1.6 g/kg/day. Some people, especially those in a calorie deficit, may benefit from going toward the top of the range.
For comparison, the standard Recommended Dietary Allowance (RDA) is 0.8 g/kg/day. That figure is set to prevent deficiency in the general population. It is not a target for building muscle.
Protein supports muscle growth, but it cannot replace training. Progressive resistance training is what drives growth, and protein supplies the raw material your body uses to rebuild. If you want to understand the process itself, see our guide on what muscle hypertrophy is and how it works.
Daily Protein Targets by Body Weight
The table below shows approximate daily intakes at the low, middle, and high ends of the evidence-based range. Values are rounded.
To convert pounds to kilograms, divide by 2.2. A 165 lb person weighs about 75 kg, so a 1.6 g/kg target works out to roughly 120 g per day.
Why the Range Varies From Person to Person
A single number can’t fit everyone, which is why experts give a range. Several factors shape where you should land.
Calorie Intake
When you eat in a surplus, your body has plenty of energy, and about 1.6 g/kg is usually enough. During a cut, protein needs tend to rise because the body is more likely to break down muscle for fuel. Many lifters aim for 2.0 g/kg or slightly higher while dieting to help preserve lean mass.
Training Experience
Beginners often build muscle quickly on modest protein intakes because their training stimulus is so new. Experienced lifters gain more slowly and may get more value from consistently hitting the middle-to-upper part of the range.
Age
Older adults tend to show “anabolic resistance,” meaning muscles respond less strongly to a given dose of protein. Eating somewhat larger protein portions at each meal, rather than only raising the daily total, can help.
Body Composition
If you carry a lot of body fat, calculating protein from total body weight can overestimate your needs. A practical workaround is to base your target on your goal body weight or estimated lean mass.
Plant-Based Diets
Many plant proteins contain less leucine or are digested slightly less efficiently than animal proteins. Vegans and vegetarians can still build muscle well. Aiming toward the higher end of the range and combining sources such as legumes, soy, grains, and seeds helps cover amino acid needs.
Protein Timing and Resistance Training
Total daily protein matters most. Timing is a secondary refinement, but it is still worth getting right once your daily total is consistent.
- Spread intake across meals. Research by Schoenfeld and Aragon suggests about 0.4 g/kg per meal across at least four meals. For a 75 kg person, that’s roughly 30 g per meal.
- Eat protein around training. A protein-rich meal within a few hours before or after your workout covers recovery needs. The “30-minute anabolic window” is far more flexible than once believed.
- Consider protein before bed. A slow-digesting source such as casein, cottage cheese, or Greek yogurt can add to your daily total and supply amino acids overnight.
- Train consistently. Protein amplifies the response to lifting. It does not create muscle on its own. Pair your nutrition with a solid program built on the best rep range for muscle growth.
Best Food Sources of Protein
Whole foods should form the foundation of your intake. Protein values below are approximate and vary by brand and preparation.
Lean Meats and Fish
Cooked chicken breast provides about 31 g per 100 g. Drained canned tuna provides about 25 g per 100 g.
Eggs and Dairy
One large egg has about 6 g. A cup of cottage cheese has roughly 25 g, and 170 g of plain Greek yogurt has around 15–17 g.
Plant Proteins
A cup of cooked lentils offers about 18 g. Firm tofu, tempeh, and edamame are versatile soy options.
Sample Day at Roughly 130 g of Protein
Here’s how an 80 kg lifter might hit a 1.6 g/kg target without any supplements:
- Breakfast: 3 eggs plus a cup of Greek yogurt with berries (about 35 g)
- Lunch: 120 g chicken breast, rice, and vegetables (about 37 g)
- Snack: A cup of cottage cheese with fruit (about 25 g)
- Dinner: A salmon fillet or a lentil and tofu stir-fry with whole grains (about 33 g)
Small extras like milk, cheese, beans, or a handful of nuts add a few more grams and give you a buffer on busy days.
Is Whey Protein Necessary?
No. Whey is a convenience tool, not a requirement. It digests quickly, contains plenty of leucine, and typically provides about 20–25 g of protein per scoop. That makes it handy when you’re short on time or struggling to reach your target from food alone.
If you choose a supplement, look for products with third-party testing for purity. Plant-based powders made from pea, soy, or blends work well for people who avoid dairy. Treat powders as a way to fill gaps, not as a replacement for balanced meals.
Safety: Can You Eat Too Much Protein?
For healthy adults, protein intakes within and somewhat above the 1.4–2.0 g/kg range have generally not been linked to harm in the research. Going much higher rarely adds muscle, though. Extra protein also crowds out the carbohydrates that fuel hard training and the fats your body needs.
Drink enough water, keep your diet varied, and remember that no protein target guarantees a specific amount of muscle gain. Training quality, sleep, total calories, and genetics all play major roles.
Frequently Asked Questions
Can I build muscle on the RDA of 0.8 g/kg?
Some muscle gain is possible, especially for beginners. However, studies consistently show better results at higher intakes for people doing resistance training.
Is there a maximum amount of protein my body can use per meal?
Your body absorbs nearly all the protein you eat. Larger servings simply take longer to digest. Muscle-building signals may peak around 0.4 g/kg per meal, but bigger meals aren’t wasted. Spreading protein across meals is a practical strategy, not a strict rule.
Do women need different amounts?
The per-kilogram recommendations apply to both men and women. Because women are often lighter, their total daily grams are usually lower.
Should I eat protein on rest days?
Yes. Muscle repair continues for a day or more after training, so keep your daily intake consistent, including on rest days.
Summary
To build muscle, most active adults should aim for 1.4–2.0 g of protein per kilogram of body weight daily, with about 1.6 g/kg as a reliable target. Move higher during fat loss, with age, or on a plant-based diet. Spread your intake over three to five meals and build them around whole foods. Use whey only if it makes life easier. Most importantly, pair your nutrition with consistent, progressive resistance training.
References
- Jäger R, et al. International Society of Sports Nutrition Position Stand: protein and exercise. Journal of the International Society of Sports Nutrition, 2017.
- Morton RW, et al. A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. British Journal of Sports Medicine, 2018.
- Schoenfeld BJ, Aragon AA. How much protein can the body use in a single meal for muscle-building? Journal of the International Society of Sports Nutrition, 2018.
Put Your Protein to Work
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