One cooked beef sirloin steak provides ~26 g protein per 3 oz (85 g) or ~31 g per 100 g, with trim and doneness nudging the number.
Here’s a clear, no-fluff take on beef sirloin steak protein. You’ll see grams per serving, a fast ounce-to-gram rule, how raw vs. cooked weight changes the math, and where sirloin sits next to other steaks. Links to source data are included so you can check the numbers yourself.
Beef Sirloin Steak Protein By Serving Size
USDA-linked lab data puts top sirloin at about 26 g protein per 3 oz cooked. That’s roughly 8.7 g per cooked ounce. Use the table below to size your plate fast.
| Cooked Serving | Protein (g) | Quick Note |
|---|---|---|
| 2 oz (56 g) | ~17 g | Snack add-on |
| 3 oz (85 g) | ~26 g | Common label serving |
| 4 oz (113 g) | ~35 g | Light entrée |
| 5 oz (142 g) | ~43 g | Hearty salad topper |
| 6 oz (170 g) | ~52 g | Restaurant plate |
| 8 oz (227 g) | ~70 g | Shareable portion |
| 10 oz (284 g) | ~87 g | Large steakhouse cut |
| 12 oz (340 g) | ~104 g | Very large portion |
| 16 oz (454 g) | ~139 g | Two plates’ worth |
Those values use a simple multiplier from cooked sirloin: ~8.7 g protein per cooked ounce (based on 26 g in 3 oz). If your steak is bone-in or extra fatty, bump the portion size a touch to hit the same protein grams.
What Shifts The Protein Number
- Trim and grade: Lean-only slices show slightly higher protein per 100 g because fat and water take up less space.
- Doneness: Higher heat dries the steak more, concentrating protein per 100 g of cooked weight, even though total protein in the piece stays about the same.
- Cut thickness and rest time: Thicker steaks lose moisture more slowly; longer rests push some juices back in. Both can nudge yield.
- Raw vs. cooked math: Raw weight overstates protein if you don’t apply a cooking-yield factor. See the yield table below.
For a verified nutrient readout on top sirloin, check the USDA-sourced sirloin facts. It lists ~26 g protein per 3 oz cooked and a protein density just over 30 g per 100 g cooked.
Sirloin Steak Protein Per 100 Grams — Lean Cuts Compared
When you compare cooked steaks by weight, lean cuts cluster in a tight band. Top sirloin lands near ~31 g protein per 100 g cooked. Ribeye sits a touch lower per 100 g due to more fat, though total protein per piece can still be high once the portion grows. See a ribeye readout here: cooked ribeye profile.
Ounce-To-Gram Shortcut
Need a fast rule for meal prep? For beef sirloin steak protein, use ~9 g per cooked ounce. That covers most lean, boneless sirloin plates at common doneness.
Where Sirloin Earns Its Protein Score
Beef supplies all nine essential amino acids, with generous leucine for muscle protein synthesis. In practice, that means sirloin counts as a complete protein source. If you’re spreading protein evenly through the day, a 3–6 oz cooked portion at a meal plugs a big share of the target.
Beef Sirloin Steak Protein And Your Daily Goal
The standard protein target for healthy adults starts at 0.8 g per kg body weight per day. That’s the baseline, not a ceiling. Some people choose more based on training, age, or goals. Use it as a planning anchor, then adjust with your coach or clinician if needed.
Quick math: convert pounds to kilograms (lbs ÷ 2.205), then multiply by 0.8. A 75-kg person starts near 60 g/day; a 90-kg person starts near 72 g/day. Split that across breakfast, lunch, dinner, and a snack so each sitting lands in the 20–40 g range.
Two sample lineups:
- Higher-protein day: Breakfast 25 g, lunch 35 g, dinner 40 g, snack 15 g (total 115 g).
- Baseline day: Breakfast 20 g, lunch 25 g, dinner 30 g, snack 10 g (total 85 g).
Where does sirloin fit? A 4–6 oz cooked top sirloin covers ~35–52 g in one go, which makes it simple to hit the mealtime target without oversizing the plate.
Cooking Yield: Raw Weight Vs. Cooked Weight
Raw steak sheds moisture and some fat as it cooks. That shrinkage is called cooking yield. Yields vary by cut and method, but steaks often land around three-quarters of their raw weight after grilling or broiling. Use the ranges below to convert recipes that list raw weights into realistic plated protein.
| Cooking Method (Steaks) | Typical Yield Range | How To Use It |
|---|---|---|
| Grilled/Broiled | ~76–80% | 1 lb raw → ~12–13 oz cooked |
| Pan-Sear + Oven Finish | ~75–80% | Apply ~0.78× to raw weight |
| Roasted (Roasts Sliced Thin) | ~80–84% | Lower surface loss vs. direct flame |
| Braised/Stewed | ~66–75% | More moisture movement into liquid |
| Very Well-Done | Can drop a few points | Extra drying concentrates protein per 100 g |
| Bone-In Steaks | Protein unchanged, yield varies | Weigh edible portion, not the bone |
| Trimmed Lean-Only | Appears higher per 100 g | Less fat and water, same amino grams |
For primary data on moisture/fat change and cooked yield by cut and method, see the USDA cooking-yields table. It lists steak-level yields for grill, broil, roast, and braise protocols used in lab studies.
Cut Differences Inside Sirloin
“Sirloin” spans a few muscles. Two you’ll see often:
- Top sirloin: Leaner, steady protein density, widely sold in 3–6 oz portions. The USDA-linked entry used here shows ~26 g in 3 oz cooked.
- Sirloin tip (knuckle): Often a bit leaner per 100 g cooked than rib cuts; can be sliced thin for meal prep and quick sautés.
Between lean sirloin and marbled steaks like ribeye, the main shift is calories from fat. Protein grams per cooked ounce stay in the same neighborhood for similarly trimmed pieces; fat grams swing more.
Beef Sirloin Steak Protein For Common Orders
- 6 oz cooked sirloin: ~52 g protein
- 8 oz cooked sirloin: ~70 g protein
- 10 oz cooked sirloin: ~87 g protein
Protein Quality And Amino Acids
Beef delivers a complete amino acid pattern with abundant leucine, isoleucine, and valine. Those branched-chain amino acids support muscle work and recovery. For planning purposes, count sirloin as a “high-quality” protein serving alongside poultry, fish, eggs, soy foods, and dairy.
How To Weigh And Log Without Guesswork
- Pick a state: Decide if you’ll track cooked weight only. Be consistent across the week.
- Use the yield factor: If your plan lists raw weights, multiply by ~0.78 to estimate cooked steak weight for grill/broil methods.
- Apply the sirloin rule: Multiply cooked ounces by ~8.7 g to get beef sirloin steak protein grams.
- Note doneness: If you cook hotter and longer than usual, expect a slightly smaller cooked weight and a slightly higher protein density per 100 g.
FAQ-Style Quick Hits (No Fluff)
Is 3 Oz Cooked Sirloin Enough?
It’s ~26 g protein. Pair it with eggs, dairy, beans, tofu, or grains across the day to reach your target.
Is Sirloin Better Than Ribeye For Protein?
Per 100 g cooked, lean sirloin trends a bit higher. Per steak, both can land in the same range once portion sizes change. Pick the cut that fits your calories and taste.
What About Raw 8 Oz Turned Cooked?
With a ~78% yield, 8 oz raw becomes ~6.25 oz cooked. Using the sirloin rule, that’s ~54 g protein.
Bottom Line
For a reliable count, plan on ~26 g protein per 3 oz cooked of top sirloin, or ~9 g per cooked ounce. Scale the portion to your goal and apply a yield factor when converting from raw weights. That’s all you need to turn beef sirloin steak protein grams into a simple, repeatable habit.