A typical steak provides about 7 grams of protein per ounce of cooked meat. That means a 6-ounce steak delivers roughly 42 grams of protein, an 8-ounce steak around 56 grams, and a 12-ounce steak about 84 grams. The exact number shifts depending on the cut, how much fat it carries, and how you measure it, but that 7-grams-per-ounce rule gives you a reliable ballpark for any beef steak on your plate.
Protein by Steak Size
Most people encounter steak in restaurant portions or standard grocery sizes, so here’s what you’re looking at in practical terms:
- 4 oz cooked (small filet): ~28 g protein
- 6 oz cooked (standard restaurant portion): ~42 g protein
- 8 oz cooked (common dinner steak): ~56 g protein
- 12 oz cooked (large ribeye or NY strip): ~84 g protein
These numbers assume cooked weight. If you’re starting with raw steak, the math changes because meat loses about 25% of its weight during cooking as water evaporates. A raw 8-ounce steak shrinks to roughly 6 ounces once cooked, but the protein stays the same. So 8 ounces raw and 6 ounces cooked contain identical protein. If you’re tracking macros, make sure you know which weight your nutrition app is using.
How the Cut Affects Protein
Leaner cuts pack more protein per ounce because there’s less fat taking up space. A top round steak or sirloin, trimmed of visible fat, sits at the higher end of the protein range. Fattier cuts like ribeye or short ribs fall slightly lower per ounce because more of each bite is fat rather than muscle tissue.
The difference isn’t dramatic. A 3-ounce serving of cooked top round delivers roughly 26 grams of protein, while the same weight of ribeye comes in closer to 22 grams. For most people, that gap is negligible. But if you’re choosing between cuts specifically to maximize protein while minimizing calories, leaner options like sirloin, top round, or tenderloin (filet mignon) give you more protein per calorie.
Why Steak Protein Is Highly Absorbable
Not all protein sources are created equal when it comes to how well your body can use them. Beef scores exceptionally well on the DIAAS scale, which measures how completely your digestive system absorbs and uses the amino acids in a food. Most beef products score above 100, which is the threshold for a “high quality” rating. That means your body can use virtually all of the protein listed on the label, unlike some plant proteins where a significant portion passes through without being fully absorbed.
Steak is also rich in leucine, an amino acid that plays a central role in triggering muscle repair and growth. A single 3-ounce serving of cooked top round contains about 2.4 grams of leucine. Even fattier cuts like tenderloin still provide around 1.8 grams per 3-ounce serving. For context, research suggests that roughly 2 to 3 grams of leucine per meal is the threshold needed to fully activate your body’s muscle-building response.
One thing worth noting: overcooking steak can reduce how well your body absorbs its amino acids. Cooking to medium or medium-rare preserves protein quality better than charring it to well-done.
How Much Your Body Can Use at Once
Eating a bigger steak doesn’t necessarily mean more muscle-building benefit. Research from the University of Texas found that a 4-ounce serving of lean beef (about 30 grams of protein) increased muscle protein synthesis by roughly 50% in both younger and older adults. But tripling that portion to 12 ounces produced no additional increase in muscle building, despite containing three times the protein and calories.
This doesn’t mean extra protein is “wasted” in a metabolic sense. Your body still uses it for energy, immune function, and other processes. But if your goal is building or maintaining muscle, spreading your steak across two meals rather than eating one massive portion gives you two separate spikes in muscle repair instead of one. A 6-ounce steak at dinner and leftover slices on a salad at lunch is more efficient than a single 12-ounce ribeye.
Steak vs. Other Protein Sources
Steak holds its own against any protein source, but it’s useful to see how it compares ounce for ounce:
- Chicken breast: ~7–8 g protein per cooked ounce (similar to lean steak, lower in fat)
- Salmon: ~6–7 g per cooked ounce (with added omega-3 fats)
- Eggs: ~6 g per large egg (you’d need 7 eggs to match a 6 oz steak)
- Tofu: ~2–3 g per ounce (with lower absorption rates)
Steak’s advantage over many of these alternatives is its amino acid density and absorption rate. You get a complete amino acid profile in a compact serving, and your body uses nearly all of it. The tradeoff is that fattier cuts come with more saturated fat and calories than chicken or fish, so the best choice depends on your overall dietary goals.
Quick Way to Estimate Protein at a Restaurant
If you’re eating out and want a fast estimate without pulling out an app, just multiply the stated ounce size of the steak by 7. A 10-ounce New York strip is about 70 grams of protein. A petite 5-ounce filet is around 35. Restaurant menus almost always list the raw pre-cooked weight, so the steak that arrives on your plate will look smaller than advertised, but the protein content matches the number on the menu.