Most raw, boneless meat lands between about 20 and 26 grams of protein per 100-gram serving, but the exact number shifts meaningfully depending on the animal, the cut, and how much fat and water that cut carries. A lean chicken breast and a well-marbled ribeye are both “meat,” yet they can differ by five or more grams of protein per serving. Understanding those differences matters if you are tracking intake closely, choosing between cuts at the grocery store, or comparing meat to other protein sources.
Beef Cuts and Why They Vary
Beef is where the widest protein swings show up, because beef cuts range from extremely lean to heavily marbled. A raw top round or eye of round typically delivers around 22 to 23 grams of protein per 100 grams, while a raw ribeye with visible marbling sits closer to 17 to 19 grams. The difference comes down to simple displacement: fat takes up space that would otherwise be occupied by muscle fiber, so fattier cuts contain proportionally less protein per gram.
A U.S. study examining 16 retail beef cuts found that protein, fat, and moisture concentrations varied considerably across cuts from the chuck, rib, and loin, and that cooking method added another layer of complexity to those numbers.1Journal of Food Composition and Analysis. Protein, fat, moisture and cooking yields from a U.S. study of retail beef cuts Once you cook beef, the water loss concentrates the protein. A cooked sirloin steak, for example, can test at 28 to 31 grams per 100 grams simply because it lost moisture during grilling. That does not mean cooking created protein; the same steak just weighs less afterward, so the protein percentage rises.
If you are comparing nutrition labels on packaged raw beef, keep in mind that trim level matters enormously. A “93% lean” ground beef has more protein per serving than “80% lean” because the remaining 20% in the latter is mostly fat. For ground beef specifically, a rough rule is that every step up in leanness adds about one gram of protein per 100-gram raw portion.
Poultry Cuts
Chicken breast is the poster child for high-protein meat, and the reputation is earned. A raw, skinless chicken breast typically contains about 23 to 24 grams of protein per 100 grams. Chicken thigh, by contrast, comes in around 18 to 20 grams raw and skinless. The gap reflects the same fat-displacement principle seen in beef: thigh meat carries more intramuscular fat, which pushes the protein percentage down.
Research comparing breast and thigh meat across different chicken breeds, including commercial broilers and spent hens, consistently finds that breast meat has a higher protein concentration regardless of the breed being studied.2PubMed Central. Differences in Physicochemical and Nutritional Properties of Breast and Thigh Meat from Crossbred Chickens, Commercial Broilers, and Spent Hens The pattern holds in other poultry species too. A study comparing pheasant and broiler chicken found that pheasant breast muscle contained far more protein on a dry-matter basis than thigh muscle, and also carried substantially less fat.3Acta Veterinaria Brno. Comparison of nutritional values of pheasant and broiler chicken meats
Turkey follows a similar pattern. Turkey breast is among the leanest widely available meats, often hitting 24 to 25 grams of protein per 100 grams raw, while turkey thigh falls a few grams below that. Duck is the outlier in the poultry world: its meat is darker and fattier overall, so even duck breast typically sits around 19 grams of protein raw, closer to what you would expect from a chicken thigh than a chicken breast.
Pork Cuts
Pork tenderloin is the leanest common pork cut and rivals chicken breast at roughly 21 to 22 grams of protein per 100 grams raw. Pork loin chops come in just behind, around 20 to 21 grams. The story changes with fattier cuts. Pork belly, used to make bacon, can drop below 15 grams of protein per 100 grams because fat accounts for such a large share of its weight. Pork shoulder sits somewhere in the middle, around 17 to 19 grams depending on how much external fat has been trimmed.
Cured and processed pork products are a separate category. Bacon, ham, sausages, and deli meats have had water, salt, sugar, and other ingredients added, which dilutes protein concentration. Research on processed meat formulations has shown that the water and salt content in these products directly affects how much protein is available per serving.4Meat Science. Effect of water and salt content on protein solubility and water retention of meat preblends A slice of deli ham might give you 14 to 16 grams per 100 grams, and mass-market sausages can dip even lower because fillers and fat take up so much of the product.
Lamb, Venison, and Game Meats
Lamb leg and loin cuts tend to range from 20 to 22 grams of protein per 100 grams raw, roughly comparable to moderately lean beef. But lamb cuts vary among themselves in more than just protein. A study of five retail lamb cuts from extensively finished lambs found meaningful variation in protein, total fat, zinc, iron, and several fatty acid fractions across cuts.5PubMed. Nutritional composition of lamb retail cuts from the carcases of extensively finished lambs Shoulder and shank cuts, which do more mechanical work on the animal, tend to have more connective tissue and slightly different protein compositions than loin cuts, even when overall protein grams are similar.
Wild game meats generally outperform their farmed counterparts on protein. Animals that live actively tend to accumulate less intramuscular fat, so more of their tissue is lean muscle. A comparison of European roe deer, wild boar, red deer, and beaver found that red deer meat had the highest protein content at about 23%, while wild boar had the lowest protein and highest fat among the four species.6PubMed. Comparison studies of the chemical, physical, technological, and microbiological characteristics of the European roe deer, boar, red deer, and beaver hunted wild game meat Bison, elk, and kangaroo similarly test high for protein density, often exceeding 22 grams per 100 grams raw, because these animals carry so little marbling.
Organ Meats Are Not All the Same
People sometimes assume that organs are uniformly high in protein because they are dense in micronutrients. The reality is more variable. Liver is the protein standout among organs, with one study of ovine organ meats reporting liver at about 19.3 grams of protein per 100 grams, spleen at 17.2 grams, heart at 13.8 grams, and kidney at just 12.8 grams.7International Journal of Food Science and Technology. Composition, chemical and microbiological properties of Jordanian ovine organ meats Kidney’s low protein and high moisture content is consistent with findings from camel research, which also showed kidneys lagging behind liver and heart in protein while being higher in moisture and sodium.8Meat Science. Nutrient composition of Najdi-camel meat
If you are eating liver specifically for protein, beef liver (around 20 grams per 100 grams raw) is a solid source, though still below a lean steak. The real case for organ meats is their micronutrient density: iron, zinc, B vitamins, and vitamin A in concentrations that skeletal muscle cannot match. Thinking of them as protein powerhouses, though, overstates the case for organs like kidney and heart.
What Cooking Does to Protein Content
Cooking concentrates protein by driving off water, so cooked meat nearly always tests higher in protein per 100 grams than the same cut tested raw. The degree of concentration depends on the cooking method. Frying and roasting drive off more moisture than steaming or boiling, which means the protein percentage climbs higher in dry-heat preparations. A study on fish demonstrated this clearly: fried fillets had the highest protein concentration, followed by roasted, then raw, with steamed coming in last.9PubMed Central. Effects of Cooking Processes on Protein Nutritional Values and Volatile Flavor Substances of Silver Carp (Hypophthalmichthys molitrix) The same pattern applies to beef and poultry.
A separate and more nuanced question is whether cooking changes how well your body actually absorbs the protein. The answer is: barely, and sometimes cooking helps. A study measuring real digestibility of bovine meat protein in rats found that raw, barbecued, grilled, and roasted beef all had digestibility above 96%, with boiled meat slightly lower at about 94.5%.10The Journal of Nutrition. Cooking of Bovine Meat Moderately Decreases Protein Digestibility in Rats but Does Not Affect Colonic Cecal Bacterial Metabolism and Intestinal Tissues In a human trial, beef cooked at high temperatures for long periods showed a small decrease in digestibility compared to rare-cooked beef, dropping from about 94% to 90%, though the difference did not reach clear statistical significance.11The Journal of Nutrition. High True Ileal Digestibility but Not Postprandial Utilization of Nitrogen from Bovine Meat Protein in Humans Is Moderately Decreased by High-Temperature, Long-Duration Cooking The practical takeaway: cook your meat however you enjoy it. The digestibility differences are real but small enough that they will not change your protein math in a meaningful way.
Why Label Numbers Can Be Slightly Off
Most nutrition labels and food composition databases estimate protein by measuring the total nitrogen in a food and multiplying by 6.25. The problem is that not all nitrogen in meat comes from protein. Some comes from non-protein compounds, and connective-tissue proteins like collagen have higher nitrogen concentrations than regular muscle proteins, which inflates the calculated number. Research on the Kjeldahl method for meat found that the presence of variable amounts of connective tissue and non-protein nitrogen produces error when the standard 6.25 conversion factor is used.12Journal of AOAC INTERNATIONAL. Determination of Nitrogen and Protein Content of Meat and Meat Products
How large is the discrepancy? A study comparing total amino acid content to the standard nitrogen-based protein estimate across multiple beef cuts found that actual amino acids amounted to about 91% of the nitrogen-calculated value on average, and the correlation between the two methods was poor.13PubMed. Total nitrogen vs. amino-acid profile as indicator of protein content of beef In plain terms, if a label says 25 grams of protein, the functional protein your body can use as amino acids is closer to 23 grams. The gap is not enormous, but if you are meticulously tracking intake, it is worth knowing that label numbers are a slight overcount for meat.
Protein Quality Beyond the Gram Count
Grams of protein tell you how much is there, but not how useful it is to your body. Meat protein is considered high quality because it contains all the essential amino acids in proportions that match human needs well. When researchers compare meat-based burgers to plant-based analogs using protein quality scores, meat consistently comes out ahead, with plant-based products showing lower levels of certain essential amino acids like threonine and arginine.14Journal of Food Composition and Analysis. Assessing the nutritional equivalence, composition, and protein quality of plant-based and meat-based burger patties
This does not mean plant protein is bad. It means that gram-for-gram, you get more usable amino acids from meat. Among meats, the quality differences are small. Chicken breast, beef sirloin, and pork loin all deliver complete amino acid profiles. The amino acid that gets the most attention in muscle-building contexts is leucine, which triggers muscle protein synthesis, and meat is one of the richest dietary sources of it.15PubMed Central. Where to Find Leucine in Food and How to Feed Elderly With Sarcopenia in Order to Counteract Loss of Muscle Mass Within the meat category, differences in leucine content are modest enough that you do not need to pick cuts based on amino acid profiles. Any lean cut from any common animal covers the bases.
How Plant-Based Analogs Compare
Plant-based meat substitutes have gotten much better at mimicking texture and flavor, but most still trail real meat in protein content. An analysis comparing several commercial plant-based analogs to conventional meat found that meat exceeded 25 grams of protein per 100 grams, while the plant-based products ranged from about 14 to 20 grams.16Food Hydrocolloids. Meat and plant-based meat analogs: Nutritional profile and in vitro digestion comparison The gap widened further after simulated digestion, with the plant-based products showing lower protein digestibility and producing fewer bioactive peptides. The plant analogs did have some compositional advantages, including dietary fiber, higher polyunsaturated fat, and no cholesterol, but their average sodium content was roughly eight times higher than that of the meat samples.
If you are substituting plant-based products for meat and trying to hit a protein target, you will likely need a larger serving or a supplementary protein source. This is a straightforward math problem, not an argument for or against either food. Just be aware that a plant-based burger patty and a beef patty are not interchangeable on protein grams, even if they look and taste similar.
Skin, Connective Tissue, and Collagen
Chicken skin, pork rinds, and the gristly bits of a slow-cooked roast all contain protein, but most of it is collagen rather than the complete muscle proteins found in lean cuts. Collagen is rich in certain amino acids like glycine and proline but lacks others, making it an incomplete protein on its own. When chicken skin is stewed, the long collagen chains gradually break down into shorter peptides, changing the protein’s structure and properties.17Food Bioscience. Changes in protein structural characteristics and non-targeted metabolites during stewing based on collagen degradation in chicken skin Your body can still use the amino acids from collagen for general protein needs and for synthesizing its own collagen, but relying on skin and connective tissue as your primary protein source would leave gaps in your essential amino acid intake.
Cuts with a lot of connective tissue, like beef shank, oxtail, or pork hocks, test at reasonable total protein numbers on a label, but a meaningful share of that protein is collagen rather than the myosin and actin that make up most of what your muscles can directly use. For most people this is academic, since these cuts are rarely anyone’s sole protein source. But if you are eating bone broth or collagen supplements and counting those grams toward your daily protein target, you are being a bit generous with yourself.
How Animal Age Affects the Protein in Your Cut
The age of the animal at slaughter subtly alters the composition of the meat. In cattle, connective tissue protein increases gradually as the animal matures. Research on bovine longissimus muscle found that the protein content of isolated connective tissue residue rose steadily from 6 months to 18 months of age.18Journal of Animal Science. Effects of Age and Sex on Quality, Tenderness and Collagen Content of Bovine Longissimus Muscle However, younger animals had higher collagen content in that connective tissue. A separate study comparing veal to meat from mature steers and cows found that veal contained more collagen and elastin overall than the older animals.19Journal of Animal Science. The Effect of Age and Grade on the Collagen and Elastin Content of Beef and Veal
What this means practically is that veal, while tender, has a slightly different protein composition than mature beef: more of its protein is connective tissue, and less is pure muscle fiber. The total grams of protein per serving are similar, but the functional profile shifts. For most people choosing between veal and beef at a restaurant, this is a curiosity rather than a dealbreaker. But it is one more reminder that “protein” is not a single uniform substance. The type of protein, the ratio of muscle to connective tissue, and even the amino acid makeup all vary with the cut, the species, and the life the animal led.
A Quick Reference by Common Cuts
Since the whole point of searching this topic is usually to compare numbers, here is a practical overview of approximate raw protein content per 100 grams for common cuts, with skin removed and external fat trimmed where applicable:
- Chicken breast: 23–24 g
- Chicken thigh: 18–20 g
- Turkey breast: 24–25 g
- Duck breast: 18–19 g
- Beef top round: 22–23 g
- Beef sirloin: 20–22 g
- Beef ribeye: 17–19 g
- Ground beef (90% lean): 20 g
- Pork tenderloin: 21–22 g
- Pork loin chop: 20–21 g
- Pork belly: 14–16 g
- Lamb leg: 20–22 g
- Venison: 22–23 g
- Bison: 22–24 g
- Beef liver: 20 g
- Kidney (ovine): 12–13 g
These numbers shift upward by roughly 30 to 50 percent once the meat is cooked, purely because of moisture loss. A cooked chicken breast that started at 24 grams raw per 100 grams might test at 31 grams per 100 grams cooked, but you are eating a smaller, lighter piece of meat than what you started with. Always check whether a nutrition source is reporting raw or cooked values before comparing across cuts, because mixing the two will throw off your estimates by a wide margin.