A typical 3-ounce serving of cooked steak provides roughly 23 to 25 grams of protein, depending on the cut and how much fat you trim away. A larger restaurant-sized portion of 6 to 8 ounces can deliver 46 to 65 grams in a single sitting. That makes steak one of the most protein-dense foods available, and the specific amount you get varies meaningfully by cut, grade, and preparation.
Protein by Cut and Trim
USDA data for a standard 3-ounce (85-gram) cooked serving of top sirloin steak illustrates how trimming fat changes the numbers. Eaten with its fat (trimmed to 1/8 inch), a choice-grade sirloin delivers 23 grams of protein and 13 grams of fat at 218 calories. Trim off the visible fat and eat only the lean portion, and you get 25 grams of protein with just 6 grams of fat at 159 calories. That’s a 27% drop in calories for a slight bump in protein.
The pattern holds across cuts. Fattier steaks like ribeye and prime rib carry more calories per serving but not significantly more protein. The extra weight in those cuts comes from intramuscular fat (marbling), not additional muscle fiber. Leaner cuts like eye of round, top sirloin, and flank steak pack a higher protein-to-calorie ratio because there’s simply less fat diluting each bite.
As a practical rule from the British Dietetic Association: 100 grams of cooked meat gives you about 30 grams of protein. That holds reasonably well across beef cuts and gives you a quick way to estimate protein when you know the weight of your steak.
How Cooking Changes the Numbers
Raw and cooked steak have different protein densities, and this trips people up when tracking macros. A steak loses roughly 24 to 25% of its weight during cooking, mostly from moisture evaporating. A study analyzing USDA Prime beef cuts found cook loss ranging from 23.6% for strip loin to 25.3% for top sirloin. That means a 12-ounce raw steak becomes about a 9-ounce cooked steak.
Because water leaves but the protein stays, cooked steak is more concentrated in both protein and fat per gram than raw steak. If your food label or tracking app lists values for raw beef, the cooked portion on your plate will have more protein per ounce than the raw number suggests. Most USDA nutritional data (and the figures in this article) refer to cooked weight, which is what you’d actually weigh on your plate.
Quick Protein Estimates by Portion Size
Most people don’t eat a precise 3-ounce steak. Here’s how the protein scales up for cooked lean steak:
- 3 ounces (85g): 25 grams of protein, roughly the size of a deck of cards
- 6 ounces (170g): 50 grams of protein, a typical restaurant filet
- 8 ounces (227g): 65 to 67 grams of protein, a standard steakhouse portion
- 12 ounces (340g): about 100 grams of protein, a large ribeye or T-bone
These estimates assume a lean or trimmed cut. A heavily marbled prime ribeye will deliver slightly less protein per ounce because more of that weight is fat.
Lean Cuts vs. Fatty Cuts
The USDA defines a lean cut of beef as one that contains less than 10 grams of total fat per 3.5-ounce (100-gram) serving. An extra-lean cut has less than 5 grams. Eye of round is considered the leanest widely available steak cut. Top sirloin, bottom round, and top round also fall into the lean category.
On the other end, prime-grade ribeye and prime rib carry substantially more fat. USDA grading reflects this directly: Prime has the most visible marbling, Choice has less, and Select has the least. If your goal is maximizing protein while minimizing calories, choosing Choice or Select grade steaks and trimming visible fat makes a meaningful difference. A select-grade top sirloin (lean only) delivers 25 grams of protein for just 145 calories per 3-ounce serving.
Protein Quality in Beef
Beyond the raw gram count, steak provides what nutritionists call “complete protein,” meaning it contains all nine essential amino acids your body can’t make on its own. Many plant proteins are low in one or more of these amino acids, requiring you to combine different foods to get the full set. Beef delivers them all in a single source, along with every nonessential amino acid.
Beef also scores high on protein digestibility metrics. Your body absorbs and uses a very high percentage of the protein in steak compared to many plant-based alternatives. For someone focused on muscle building or recovery, this means the 25 grams of protein listed on the label translates more efficiently into usable amino acids than the same number from less digestible sources.
Balancing Protein Goals With Overall Health
Steak is an efficient way to hit protein targets, but portion size and frequency matter. The American Heart Association’s 2026 dietary guidance recommends choosing lean cuts, avoiding processed forms, and limiting portion size when eating red meat. Their broader recommendation favors dietary patterns higher in plant-based protein and lower in animal protein for cardiovascular health.
In practical terms, this means steak works well as a protein source when you treat it as one part of a varied diet rather than your primary protein at every meal. A 6-ounce lean sirloin delivers 50 grams of protein, which is nearly the entire daily requirement for many adults, in a single serving. Pairing steak meals with days built around poultry, fish, legumes, or dairy gives you the protein quality benefits of beef without relying on it exclusively.