How Much Protein to Build Muscle: Grams by Bodyweight

To build muscle, eat about 1.6 grams of protein per kilogram of bodyweight per day. Going up to 2.2 g/kg adds a safety margin for people who respond well to more. For an 80 kg lifter, that means roughly 128 to 176 grams a day, spread over 3 to 5 meals.

Key takeaways

• 1.6 g/kg/day covers most lifters; 2.2 g/kg is the generous upper end.
• In a calorie deficit, raise protein to 1.8–2.7 g/kg to protect muscle.
• Aim for roughly 0.3–0.5 g/kg per meal, about 25–45 g, across 3–5 meals.
• Women use the same per-kilogram targets as men.
• Total daily protein matters far more than timing.

How much protein to build muscle each day?

The best summary of the research is a 2018 meta-analysis by Morton and colleagues. It found that extra protein helped muscle growth from lifting up to about 1.6 g/kg per day. Beyond that point, the average benefit leveled off.

People respond differently, so some may still gain a little from more. That is why 1.6 g/kg is the target and up to 2.2 g/kg is a sensible safety margin.

For context, the RDA is 0.8 g/kg. That figure prevents deficiency in sedentary adults. It was never meant as a target for building muscle.

Protein is only one piece. The training stimulus comes first: hard sets taken close to failure, enough weekly volume and progressive overload. If you have not sorted that out, read how many sets per week to build muscle.

Protein table by bodyweight (60–100 kg)

The table below shows daily protein at 1.6 and 2.2 g/kg. Pounds are rounded.

• 60 kg (132 lb): 1.6 g/kg per day 96 g, 2.2 g/kg per day 132 g
• 65 kg (143 lb): 1.6 g/kg per day 104 g, 2.2 g/kg per day 143 g
• 70 kg (154 lb): 1.6 g/kg per day 112 g, 2.2 g/kg per day 154 g
• 75 kg (165 lb): 1.6 g/kg per day 120 g, 2.2 g/kg per day 165 g
• 80 kg (176 lb): 1.6 g/kg per day 128 g, 2.2 g/kg per day 176 g
• 85 kg (187 lb): 1.6 g/kg per day 136 g, 2.2 g/kg per day 187 g
• 90 kg (198 lb): 1.6 g/kg per day 144 g, 2.2 g/kg per day 198 g
• 95 kg (209 lb): 1.6 g/kg per day 152 g, 2.2 g/kg per day 209 g
• 100 kg (220 lb): 1.6 g/kg per day 160 g, 2.2 g/kg per day 220 g

Daily protein (g) = bodyweight (kg) × 1.6 to 2.2

70 kg: how much protein to build muscle?

A 70 kg person needs about 112–154 g per day. Four meals of about 30–38 g each lands in that range.

80 kg: how much protein to build muscle?

At 80 kg, the range is 128–176 g per day. Four meals of 35–40 g each gives 140–160 g, which sits comfortably inside it.

90 kg: how much protein to build muscle?

At 90 kg, aim for 144–198 g per day. Four meals of about 40–45 g, or five smaller ones, works well.

What if you carry a lot of body fat?

Per-kilogram targets get inflated when much of your weight is fat. A practical fix is to base protein on your goal weight. Another option is about 1.2–1.5 g per kg of current weight.

How much protein to build muscle and lose fat?

When calories drop, protein needs go up. A deficit makes muscle easier to lose, so the target shifts to about 1.8–2.7 g/kg per day.

Very lean people dieting hard sit at the top of that range. Helms and colleagues suggested 2.3–3.1 g per kg of lean mass for this group. Higher protein also helps with fullness, which makes a diet easier to stick to.

• 70 kg: Fat loss: 1.8 g/kg 126 g, Fat loss: 2.7 g/kg 189 g
• 80 kg: Fat loss: 1.8 g/kg 144 g, Fat loss: 2.7 g/kg 216 g
• 90 kg: Fat loss: 1.8 g/kg 162 g, Fat loss: 2.7 g/kg 243 g

Protein alone will not save your muscle in a diet. Keep lifting heavy; you can cut volume by about a third. If you want to lose fat and gain muscle at the same weight, see our guide to body recomposition.

How much protein to build muscle for women?

Women use the same per-kilogram targets: about 1.6 g/kg, up to 2.2 g/kg. Women gain muscle at similar relative rates to men, even though absolute gains are smaller.

Around and after menopause, falling estrogen speeds up muscle and bone loss. In that stage, heavy lifting plus at least 1.6 g/kg of protein is especially useful.

Adults over 65 have a different starting point. A common guideline is 1.2–1.6 g/kg per day, with about 0.4 g/kg at each meal. Older muscle needs a larger dose per meal to respond fully.

How much protein per meal?

A good default is about 0.3–0.5 g/kg per meal. For most adults that is 25–45 g, eaten 3–5 times a day.

Each meal should include about 2–3 g of leucine. You get that from roughly 25–30 g of protein from whey, meat or eggs. Plant proteins need a bit more.

Is there a 30 g limit per meal?

No. The idea that your body can only "use" 30 g at a time is outdated. A 2023 study by Trommelen and colleagues gave 100 g of protein after training. The muscle-building response lasted longer, stretching across about 12 hours.

So bigger meals are not wasted. Spreading protein out is still a sensible habit, but daily total comes first.

Timing tips that actually matter

• Eat a meal with protein and carbs 1–4 hours before training.
• Get protein within a few hours after training.
• If you train fasted in the morning, take 20–40 g of protein before or after.
• Before bed, 30–40 g of slow protein supports overnight muscle building. Casein, cottage cheese or Greek yogurt all work.

Protein quality, plant diets and safety

Animal proteins, soy and protein blends are high in leucine and easy to digest. Vegans can combine legumes and grains and eat about 10–20% more total protein.

High intakes, up to about 3 g/kg, have shown no harm to healthy kidneys or bones. If you have kidney disease, follow your doctor's advice instead.

How to apply this

• Weigh yourself and note your bodyweight in kg (lb ÷ 2.2).
• Pick your multiplier: 1.6 g/kg to build muscle, 1.8–2.7 g/kg in a deficit.
• Multiply to get your daily target. Round to the nearest 5 g.
• Divide by your number of meals, aiming for 25–45 g each.
• Build each meal around one protein food first: meat, fish, eggs, dairy, tofu or legumes.
• Track for one week to check you actually hit the number.
• Fit protein into your full plan. Use calculate your TDEE for calories, then how to calculate your macros for carbs and fat.

If you struggle to hit the target, a protein powder is a convenient food, not magic. Of the true supplements, creatine has the best support for muscle and strength.

FAQ

How much protein do I need to build muscle?

Most people need about 1.6 g of protein per kg of bodyweight per day. Going up to 2.2 g/kg covers people who respond to more. For a 75 kg person, that is roughly 120–165 g a day.

How much protein do I need to build muscle and lose fat at the same time?

In a calorie deficit, aim higher at 1.8–2.7 g/kg per day. The extra protein helps protect muscle and keeps you fuller. Keep lifting heavy so your body has a reason to hold on to muscle.

How much protein should women eat to build muscle?

Women can use the same target as men: about 1.6 g/kg, up to 2.2 g/kg per day. A 60 kg woman would eat roughly 96–132 g daily. Around menopause, staying at 1.6 g/kg or more is especially helpful.

How much protein should I eat at 80 kg to build muscle?

At 80 kg, eat about 128–176 g of protein per day. Four meals of 35–40 g each is an easy way to get there. If you are dieting, raise it to about 144–216 g.

How much protein per meal can your body use?

Aim for about 0.3–0.5 g/kg per meal, which is 25–45 g for most adults. Larger meals are not wasted: a 2023 study found 100 g extended the muscle-building response to about 12 hours. Your daily total still matters most.

Is a high-protein diet bad for your kidneys?

In healthy people, intakes up to about 3 g/kg have shown no harm to kidneys or bones. People with existing kidney disease are a different case. They should follow their doctor's advice on protein.

Educational content, not medical advice.

Sources

• Morton RW et al. 2018. Protein supplementation and resistance training: systematic review and meta-analysis. British Journal of Sports Medicine. https://doi.org/10.1136/bjsports-2017-097608
• Helms ER, Aragon AA, Fitschen PJ. 2014. Evidence-based recommendations for natural bodybuilding contest preparation. Journal of the International Society of Sports Nutrition. https://doi.org/10.1186/1550-2783-11-20
• Trommelen J et al. 2023. The anabolic response to protein ingestion has no upper limit in magnitude and duration. Cell Reports Medicine. https://doi.org/10.1016/j.xcrm.2023.101324
• Helms E, Morgan A, Valdez A. 2019. The Muscle and Strength Pyramids: Nutrition, 2nd ed.

Protein targets are easy once you have the numbers in one place. The Field Manual puts protein, calorie and macro formulas on a single formula sheet. Its knowledge checks let you practice the math on real client examples.