How Much Protein Do You Need to Build Muscle?
By CoachAk · · 4 min read
Protein is the one nutrition target almost every lifter gets asked about, and one of the few where the research gives a fairly clear answer. Here is how much you need, why, and how to actually hit it without living on shakes.
The short answer
For most people who lift weights, 1.6 to 2.2 grams of protein per kilogram of body weight per day (about 0.7 to 1 gram per pound) covers what you need to build muscle.
- 1.6 g/kg is where the benefit starts to level off for most people.
- 2.2 g/kg is a sensible upper end that covers individual differences.
- On a fat-loss diet, aim toward the top of that range, because protein helps you keep muscle while calories are low.
For an 80 kg (176 lb) lifter, that is roughly 130 to 175 grams of protein a day.
Where these numbers come from
The 1.6 g/kg figure comes from a large 2018 meta-analysis by Morton and colleagues, published in the British Journal of Sports Medicine. It pooled 49 studies on protein and resistance training. Gains in muscle mass levelled off at around 1.6 g/kg per day on average, and the authors suggested going up to 2.2 g/kg to be confident of covering most people.
That is a useful reminder that more is not endlessly better. Going from 1.0 to 1.6 g/kg makes a real difference. Going from 2.2 to 3.5 g/kg mostly just replaces carbohydrate and fat you could have enjoyed instead.
Why you need more when dieting
When you eat less than you burn, your body is more willing to break down muscle for energy. Lifting heavy is the main signal to keep it. Higher protein is the second.
Reviews of research on lean, resistance-trained people who are dieting (for example Helms and colleagues, 2014) suggest intakes of around 2.3 to 3.1 g per kg of lean body mass during a cut. In plain terms: on a fat-loss phase, keep protein at or above the top of the normal range, and do not cut it to save calories.
If you are carrying a lot of body fat, base your target on your goal weight rather than your current weight, otherwise the numbers come out unrealistically high.
Does it matter how you split it?
Total daily protein matters most. How you split it is a smaller, secondary effect, but it is an easy win:
- Spread it over 3 to 5 meals. Roughly 0.3 to 0.4 g/kg per meal (about 25 to 40 grams for most people) is a practical target.
- Include protein at breakfast. It is the meal most people under-eat, which makes the daily total hard to reach later.
- Eat a protein-rich meal within a few hours of training. You do not need a shake in the changing room. The "anabolic window" is much wider than gym folklore suggests.
- A meal before bed can help some people reach their total, and casein-rich foods such as Greek yoghurt or cottage cheese work well there.
Good protein sources
Aim to get most of your protein from whole foods, with a shake as a convenience rather than a crutch. Approximate protein per typical portion:
| Food | Portion | Protein |
|---|---|---|
| Chicken breast, cooked | 150 g | 45 g |
| Lean beef mince (5% fat), cooked | 150 g | 40 g |
| White fish, cooked | 150 g | 35 g |
| Greek yoghurt, 0% fat | 200 g | 20 g |
| Eggs | 3 large | 19 g |
| Cottage cheese | 200 g | 22 g |
| Whey protein | 1 scoop (30 g) | 22 to 25 g |
| Tofu, firm | 200 g | 25 to 30 g |
| Lentils, cooked | 200 g | 18 g |
Values vary by brand and cut, so check labels for the foods you buy most often.
Plant-based? You can build muscle perfectly well on plant protein. Aim for the higher end of the range and mix your sources (soy, legumes, grains, seitan, pea protein) so you get a complete spread of amino acids.
Common mistakes
- Counting protein but not calories. Protein supports muscle growth, but you still need enough total food, set from your maintenance calories and your goal. If you are trying to gain muscle and your weight is not moving, look at calories first. See how fast you should gain weight on a lean bulk.
- Front-loading shakes. Three shakes a day hits the number but leaves you hungry and short on everything else whole food provides.
- Guessing portions. Most people overestimate how much protein they eat. Weigh your main protein foods for a week or two and you will learn what a real portion looks like.
- Chasing extreme numbers. Above about 2.2 g/kg, extra protein buys very little for most people outside a hard diet.
Is high protein safe?
For healthy adults, intakes in the ranges above are widely used and well studied. If you have kidney disease or another medical condition, speak to your doctor before raising your protein intake.
Putting it into practice
- Take your body weight in kilograms (or your goal weight if you have a lot of fat to lose).
- Multiply by 1.6 to 2.2. On a diet, use the top of the range.
- Divide by the number of meals you eat, and build each meal around a protein source.
- Track it for two weeks so you know what hitting the number feels like.
Or let the free protein calculator do it for you. Want your calories and other macros too? Try the macro calculator.
Protein is one target among several. Calories, training and recovery decide just as much of the result, and the right numbers for you depend on your goal and on how your body responds week to week. That is exactly what a coach adjusts.
If you would like your targets set for you and reviewed every week, apply for one-to-one coaching with CoachAk.
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