How Much Protein Do I Need to Build Muscle? (Chart by Weight)

You train hard, but are you eating enough protein to actually build the muscle? It's the most common question in nutrition for lifters, and the answer is simpler than the supplement aisle makes it look.

This guide gives you a protein target for your bodyweight, in pounds and kilograms. It covers where the numbers come from, how to split them across your meals, and why the target goes up when you're cutting.

The short answer: to build muscle, aim for 1.6 to 2.2 grams of protein per kilogram of bodyweight a day, which is about 0.7 to 1 gram per pound. For a 180 lb lifter, that's roughly 130 to 180 g of protein a day. Spread it over at least four meals of around 30 to 45 g each.

Where the 1.6–2.2 g/kg range comes from

Three well-known papers give most of the numbers you'll see quoted:

• A 2018 meta-analysis in the British Journal of Sports Medicine (Morton and colleagues, 49 studies) found that once total protein intake reached about 1.62 g/kg a day, adding more protein didn't produce further muscle gains from training.
• A 2018 review in the Journal of the International Society of Sports Nutrition (Schoenfeld and Aragon) recommends about 0.4 g/kg per meal across at least four meals, reaching a minimum of 1.6 g/kg a day. It treats 2.2 g/kg a day as the upper end, which works out to about 0.55 g/kg per meal.
• The International Society of Sports Nutrition's position stand (2017) puts the range for most people who exercise at 1.4–2.0 g/kg a day, and says intakes of 2.3–3.1 g/kg may be needed to keep muscle in resistance-trained people who are in a calorie deficit.

So 1.6 g/kg is the point where most people get most of the benefit, and 2.2 g/kg is a sensible ceiling for building muscle. Eating at the top of the range costs you nothing except money and appetite, so many lifters aim for the middle or higher to be safe.

The old gym rule of "1 gram per pound of bodyweight" is 2.2 g/kg. It's the top of the range, not the minimum, and it's an easy number to remember.

How much protein you need: chart by bodyweight

Find your bodyweight and read across. Numbers are rounded to the nearest 5 g.

In kilograms:

If you carry a lot of body fat, these numbers can come out very high, because fat tissue doesn't need the extra protein. A common workaround is to use your goal weight instead of your current weight.

How to split your protein across the day

The same 2018 review suggests spreading protein over at least four meals, at about 0.4 g/kg each. You don't have to be exact. What matters most is the daily total, and splitting it up just makes that total easier to hit.

A simple day for a 180 lb lifter aiming for about 150 g:

• Breakfast: Greek yogurt with whey or eggs on toast, around 35 g
• Lunch: a chicken or beef rice bowl, around 40 g
• After training: a protein shake, around 25–30 g
• Dinner: salmon or steak with potatoes, around 40–45 g

That's four meals and you're there, with no supplement other than one shake.

How much protein to eat on a cut

When you eat less than you burn, your body is more willing to break down muscle for energy. More protein helps you hold on to it. That's why the ISSN position stand mentions 2.3–3.1 g/kg for trained lifters in a deficit, higher than the range for building.

For a 200 lb lifter, that's about 210–280 g a day. Most people find the top of that hard to eat, so a practical target is to stay at or above 2.2 g/kg (1 g per lb) while cutting, and keep training heavy so your body has a reason to keep the muscle.

There's another reason lifters should care about this. Strength standards, including the ranks in Liftly, compare your lift with your bodyweight: your one-rep max ÷ your bodyweight. If you lose fat and keep your strength, that ratio goes up.

Here's a worked example with Liftly's chest ranks. A 200 lb lifter with an estimated bench max of 225 lb has a ratio of 1.13, which is Lifter III. Cut to 190 lb with the same estimated max and the ratio becomes 1.18: Semi-Pro I, one rank higher, without adding a pound to the bar. That only works if the cut doesn't cost you strength, and protein is a big part of keeping it. (For the full bench numbers, see how much you should bench for your weight.)

Does protein timing matter?

Less than the total. A few practical points:

• Daily total first. If you hit your number, the timing is a small extra.
• Spread it out. Four protein-rich meals beat one huge dinner, mostly because it's easier to reach the total that way.
• Around training. A protein meal within a few hours either side of your workout is plenty. You don't need to down a shake in the locker room.
• Before bed. A slow-digesting option such as Greek yogurt or cottage cheese is an easy way to add 25–40 g if you're short for the day.

Food or shakes?

Whole food is fine. Protein powder is just a convenient, cheap way to add 25 g when you're short. Good protein sources for lifters:

• Meat and fish: chicken breast, lean beef, turkey, tuna, salmon
• Dairy and eggs: Greek yogurt, cottage cheese, skyr, milk, eggs, whey
• Plant sources: tofu, tempeh, seitan, lentils, edamame, soy milk

Plant proteins work too. If you're vegan, aim for the middle or top of the range and mix your sources over the day.

How to make sure you're actually hitting it

Most people who think they eat enough protein are guessing. A quick check: write down or log everything you eat for three normal days. If you're under your number, add one protein-rich meal or a shake, and check again a week later.

Then keep an eye on the results where they show up: in the gym. If your lifts keep going up while you're eating in a surplus, or hold steady while you cut, your protein is doing its job. Logging your workouts makes that easy to see. Our guide to tracking progressive overload shows how.

FAQ

How much protein do I need a day to build muscle?

Aim for 1.6 to 2.2 grams of protein per kilogram of bodyweight a day, about 0.7 to 1 gram per pound. A 180 lb lifter needs roughly 130 to 180 g a day. Research suggests most of the muscle-building benefit is reached around 1.6 g/kg.

Is 1 gram of protein per pound too much?

No. One gram per pound is 2.2 g/kg, the top of the range research supports for building muscle. It's more than most people need, but it's not harmful for healthy people. If you have kidney disease, talk to your doctor about your protein intake.

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

It depends on your weight. 100 g covers the 1.6 g/kg minimum for someone around 140 lb (63 kg). If you weigh more, you'll likely build muscle faster eating more.

How much protein can you absorb in one meal?

Your body absorbs almost all the protein you eat. The question is how much goes toward building muscle at once. A 2018 review suggests about 0.4 g/kg per meal over at least four meals, with up to about 0.55 g/kg per meal at the top end.

Do I need more protein when cutting?

Yes. In a calorie deficit, more protein helps you keep muscle. The ISSN position stand says 2.3–3.1 g/kg may be needed for resistance-trained people in a deficit. Staying at or above 1 g per pound is a practical target.