How Much Protein Do I Need to Build Muscle?

Quick answer

Around 1.6 g per kilogram a day (range 1.4–2.2 g), spread over 3–5 meals of 20–40 g

For people doing resistance training, a large meta-analysis found that protein intake helped increase muscle mass and strength, with gains levelling off at about 1.6 g of protein per kilogram of body weight a day; some people may benefit up to about 2.2 g. The International Society of Sports Nutrition suggests 1.4–2.0 g per kilogram a day for most exercising people, with 20–40 g of high-quality protein per meal every three to four hours. A review on protein distribution suggested about 0.4 g per kilogram per meal across at least four meals. For a 70 kg person, that means about 110–155 g of protein a day. Older adults may need more protein per meal. Training is the main driver; protein supports it. People with kidney disease should get medical advice.

Important. If you have kidney disease, liver disease, diabetes or another medical condition, or if you are pregnant, talk to a doctor or dietitian before significantly increasing protein intake or taking protein supplements.

Daily protein targets for building muscle

General adult reference intake: about 0.75–0.8 g per kilogram a day, enough to prevent deficiency in sedentary adults.
For building muscle: about 1.6 g per kilogram a day for most people, with a range of 1.4–2.2 g.
During a calorie deficit: higher intakes, around 2.0–2.4 g per kilogram or more, may help preserve muscle.
Use your current weight if you are within a healthy range; if you have a lot of excess body fat, a dietitian may calculate based on target or lean body weight.

Daily protein by body weight (at 1.6 g/kg)

55 kg (121 lb): about 88 g a day.
65 kg (143 lb): about 104 g a day.
75 kg (165 lb): about 120 g a day.
85 kg (187 lb): about 136 g a day.
95 kg (209 lb): about 152 g a day.
A common rule of thumb in pounds is about 0.7 g per pound of body weight.

What the research shows

A systematic review and meta-analysis of 49 trials found that protein supplementation during prolonged resistance training increased gains in muscle mass and strength in healthy adults. The benefit levelled off at about 1.6 g per kilogram of body weight a day, with the upper confidence limit around 2.2 g, and effects were smaller in older and already well-trained people. The International Society of Sports Nutrition position stand concludes that 1.4–2.0 g per kilogram a day is sufficient for most exercising individuals.

How much protein per meal?

Muscle protein synthesis is stimulated by meals containing about 20–40 g of high-quality protein, or about 0.25–0.4 g per kilogram per meal. A review on protein distribution concluded that to maximise muscle growth, people could aim for about 0.4 g per kilogram per meal over at least four meals, reaching at least 1.6 g per kilogram a day. Larger meals are not wasted: the body still uses the protein, but spreading intake is a practical way to reach daily targets.

Does timing matter?

Total daily protein matters most.
Eating protein every three to four hours is a practical approach.
A protein-rich meal or snack within a few hours before or after training supports recovery.
A pre-sleep snack with 30–40 g of slow-digesting protein, such as Greek yoghurt or cottage cheese, may help overnight muscle repair.
Post-workout drinks are convenient but not essential; see post-workout recovery drinks.

Protein quality and leucine

Animal proteins such as dairy, eggs, meat and fish contain all essential amino acids and are rich in leucine, an amino acid that triggers muscle protein synthesis. Plant proteins can also support muscle growth, especially soy, and combining sources such as legumes and grains improves the amino acid profile. People eating mainly plant foods may need slightly larger portions to get the same effect. Ideas are in high-protein foods.

Protein for older adults and women

Older adults experience “anabolic resistance”, meaning muscles respond less to the same amount of protein. They may benefit from around 0.4 g per kilogram per meal and at least 1.2–1.6 g per kilogram a day, combined with resistance training, to slow age-related muscle loss. Women generally need the same amount per kilogram as men; differences in total grams reflect body size. Protein needs increase during pregnancy and breastfeeding.

What 120 g of protein looks like in a day

Breakfast: 200 g Greek yoghurt with oats and berries (about 25 g).
Lunch: chicken breast salad wrap (about 35 g).
Snack: two boiled eggs and a glass of milk (about 20 g).
Dinner: salmon fillet with quinoa and vegetables (about 35 g).
Evening snack: cottage cheese (about 10 g).
Plant-based swaps: tofu, tempeh, lentils, soy yoghurt and seitan.

Do you need protein powder?

Protein powders are convenient but not necessary if you can meet your needs from food. Whey and soy protein are well studied. Choose products tested by independent third parties, especially if you compete in sport, as supplements can be contaminated. Snack ideas without powders are in snacks high in protein.

Is a high-protein diet safe?

For healthy adults, protein intakes up to about 2 g per kilogram a day are generally considered safe. The ISSN position stand notes that higher intakes have not been shown to harm healthy kidneys in short-term studies. People with existing kidney disease should follow medical advice, as they may need to limit protein. A balanced diet with vegetables, wholegrains and healthy fats remains important.

Key points to remember

About 1.6 g of protein per kilogram a day covers most people building muscle.
Aim for 20–40 g of protein per meal, spread over the day.
Training is the main driver; protein supports it.
Older adults may need more protein per meal.

Questions about protein for muscle building

These answers are general information and do not replace an examination or individual medical advice.

Can you build muscle without eating a lot of protein?

Training builds muscle, but adequate protein maximises gains. Very low protein intakes limit progress.

Is 100 g of protein a day enough to build muscle?

For someone weighing around 60–70 kg, 100 g is close to the recommended target.

Can the body only absorb 30 g of protein at once?

No. The body absorbs larger amounts, though spreading protein across meals is a practical way to support muscle growth.

Is too much protein bad?

For healthy people, moderate high-protein diets are generally safe. People with kidney disease should seek advice.

Do I need protein shakes to build muscle?

No. They are a convenient option, but food can provide all the protein you need.

Sources

This guide is for general information and does not replace medical advice. How a problem is diagnosed and treated depends on your examination and medical history. If you think you have an emergency, contact your local emergency services.