Calories in Sirloin Steaks: Nutrition Facts & Serving Sizes
Per 1 steak (107g)
Per 100g
Source: USDA FoodData Central, SR Legacy, March 2026.
A sirloin steak (107g) contains about 195 calories with 30.9g of protein, making it one of the top lean beef cuts for high-protein eating. Per 100g, sirloin steak provides 182 calories with 28.9g of protein, 7.3g of fat, and 0.1g of carbs. Sirloin has less fat than ribeye but more flavor than tenderloin, making it a middle-ground cut valued for both taste and macros. The micronutrient profile is outstanding: 5.3mg of zinc per 100g (about 48% daily value), 3.3mg of iron, 2.7mcg of vitamin B12, and 264mg of phosphorus. Zinc from beef is particularly bioavailable compared to plant sources. Sirloin steak contains 0.6mg of vitamin B6 per 100g and 5.3mg of niacin, supporting protein metabolism and energy production. It is a staple protein source for anyone focused on building muscle or maintaining lean mass while cutting.
Nutrition Highlights
Calories by Serving Size
| Serving | Cal | Protein | Carbs | Fat | Fiber |
|---|---|---|---|---|---|
| 1 steak (107g) | 194.7 | 30.9g | 0.1g | 7.8g | 0g |
| 100g | 182 | 28.9g | 0.1g | 7.3g | 0g |
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Full Nutrition Facts (per 100g)
| Nutrient | Amount | % Daily Value |
|---|---|---|
| Calories | 182 | 9% |
| Protein | 28.9g | 58% |
| Total Fat | 7.3g | 9% |
| Saturated Fat | 2.6g | 13% |
| Trans Fat | 0.3g | |
| Total Carbohydrates | 0.1g | |
| Dietary Fiber | 0g | |
| Sugars | 0g | |
| Sodium | 349mg | 15% |
| Cholesterol | 82mg | 27% |
Vitamins & Minerals (per 100g)
| Nutrient | Amount | % Daily Value |
|---|---|---|
| Saturated Fat | 2.6g | 1% |
| Trans Fat | 0.3g | 0% |
| Cholesterol | 82mg | 27% |
| Calcium | 6mg | 0% |
| Iron | 3.3mg | 18% |
| Potassium | 341mg | 7% |
| Vitamin B6 | 0.6mg | 35% |
| Vitamin B12 | 2.7mcg | 113% |
| Magnesium | 24mg | 6% |
| Phosphorus | 264mg | 21% |
| Zinc | 5.3mg | 48% |
| Thiamin (B1) | 0.1mg | 8% |
| Riboflavin (B2) | 0.2mg | 15% |
| Niacin (B3) | 5.3mg | 33% |
% Daily Values based on a 2,000 calorie diet (FDA reference).
Health Benefits of Sirloin Steaks
Sirloin steak is one of the best lean beef cuts for building or maintaining muscle. At 28.9g of protein per 100g with only 7.3g of fat, the protein-to-fat ratio is much better than fattier cuts like ribeye (27g protein, 18g fat per 100g). Whether bulking or cutting, sirloin provides high-quality complete protein with all essential amino acids needed for muscle protein synthesis.
The 5.3mg of zinc per 100g is a top-tier contribution toward the 11mg daily zinc recommendation. Zinc directly influences testosterone production, immune function, and wound healing. Beef zinc is also more bioavailable than zinc from plants because animal protein does not contain phytates that block zinc absorption.
Sirloin provides 3.3mg of iron per 100g as heme iron, the most bioavailable form. Heme iron from beef is absorbed at 15 to 35%, compared to 2 to 20% for non-heme iron from plant sources. For those who train hard and sweat regularly, maintaining adequate iron levels prevents fatigue and supports oxygen delivery to muscles during exercise.
The 2.7mcg of vitamin B12 per 100g provides over 100% of the daily recommended intake in a single steak. B12 supports energy metabolism, nerve function, and red blood cell production.
Dietary Considerations
Sirloin steak is naturally gluten-free, keto-friendly (0.1g carbs per 100g), and high in bioavailable protein. It is not vegan or vegetarian. For weight loss, sirloin is an excellent choice due to its high protein and moderate fat content. It is leaner than ribeye but fattier than chicken breast or shrimp. The 349mg of sodium per 100g comes partly from natural sodium in beef and partly from processing; fresh-cut sirloin may vary.
Daily Intake (100g)
100g of sirloin steak provides 9% of a 2,000-calorie diet.
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Frequently Asked Questions
How many calories in a sirloin steak?
A sirloin steak (107g) has about 195 calories. Per 100g, sirloin contains 182 calories. A larger restaurant-sized sirloin (225g) would be about 410 calories.
Is sirloin steak good for weight loss?
Yes, sirloin is one of the better beef cuts for weight loss. At 182 calories per 100g with 28.9g of protein, it has an excellent protein-to-calorie ratio. High protein intake from lean meats supports muscle retention while in a calorie deficit.
How much protein in a sirloin steak?
A sirloin steak (107g) has about 30.9g of protein. Per 100g, sirloin contains 28.9g of protein. This makes sirloin one of the highest-protein beef cuts available.
Is sirloin leaner than ribeye?
Yes, sirloin is leaner than ribeye. Sirloin has about 7.3g of fat per 100g, while ribeye has about 18 to 20g of fat per 100g. Sirloin is a better choice for anyone watching fat intake or cutting calories, while ribeye is preferred for taste and texture.
Is sirloin steak keto-friendly?
Yes, sirloin steak is keto-friendly with only 0.1g of carbs per 100g. It is essentially a zero-carb protein source. The fat and protein content fit well within ketogenic macros.
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