Ready & Packaged Foods
All →Vegetables & Legumes
All →Desserts & Confectionery
All →Meat & Protein
All →Grains & Bakery
All →Beverages
All →Milk & Dairy
All →
Roasted beef; high in protein, very low in carbohydrates
CALORIES · 100 G
GI
POTASSIUM · 100 G
FIBER · 100 G
1 slice (thin) of Roast beef (30 g) has 51 calories. That works out to 170 calories per 100 g. It contains 0 g of carbs, 8.7 g of protein, 1.8 g of fat and 0 g of fiber. Its 0.6 µg of B12 covers 26% of the Daily Value. Its glycemic index is 0 (low), so it raises blood sugar slowly.
Selected: 1 slice (thin) · 30 g
51
KCAL / 30G
Carbs
0g
· 0% DV
Protein
8.7g
· 17% DV
Fat
1.8g
· 2% DV
Fiber
0g
· 0% DV
DV is the share of the daily value covered, on a 2,000 kcal reference diet.
Calories come from: Carbs 0% · Protein 68% · Fat 32%
| Nutrient | Amount | % DV |
|---|---|---|
| Calories | 51 kcal | |
| Total fat | 1.8 g | 2% |
| Saturated fat | 0.66 g | 3% |
| Trans fat | 0.05 g | |
| Sodium | 17 mg | 1% |
| Total carbohydrate | 0 g | 0% |
| Fiber | 0 g | 0% |
| Protein | 8.7 g | 17% |
Calories: Calories measure energy. Average daily need is 2,000 kcal. Excess calories are stored as fat, too few cause weight loss.
Carbs: Your body's primary energy source. The brain runs exclusively on carbs. Daily need: 275g.
Protein: Essential for muscle repair and cell growth. Daily need: 50g. Keeps you full and boosts metabolism.
Fat: Needed for hormone production and vitamin absorption. Daily need: 78g. Limit saturated fats, choose unsaturated.
Fiber: Critical for digestive health and satiety. Daily need: 28g. Stabilizes blood sugar, lowers cholesterol.
Log this food in EatBetter
100,000+ people use it
📸 Scan the code to get the app free.

| Serving | Amount | Calories |
|---|---|---|
| 1 slice (thin) | 30 g | 51 kcal |
| 1 slice (thin) | 20 g | 34 kcal |
| 1 slice (medium) | 30 g | 51 kcal |
| 1 slice (thick) | 45 g | 77 kcal |
| 2 ounce (medium) | 56 g | 95 kcal |
| 1 serving (small) | 85 g | 145 kcal |
| 3 slice (medium) | 90 g | 153 kcal |
| 100 g | 100 g | 170 kcal |
| 1 serving (medium) | 120 g | 204 kcal |
| 1 serving (large) | 180 g | 306 kcal |
| 1 piece (whole) | 250 g | 425 kcal |
Calculated from 170 calories per 100 g.
Roast beef is beef cooked as a whole joint, usually in an oven, then carved into slices. It can be served hot with gravy or chilled in sandwiches and salads.
Topside, sirloin, rib or tenderloin can all make roast beef. A well-marbled joint tends to stay juicier, while leaner cuts such as topside benefit from careful cooking and thin slicing.
Brown the joint in a hot pan, then roast it in the oven until it reaches your preferred doneness. Let it rest before carving so the juices settle, and slice across the grain for a more tender bite.
Yes, roast beef is often served pink in the centre, especially when cooked rare or medium-rare. Colour alone cannot confirm food safety, so use a meat thermometer and follow reliable guidance for the cut and doneness you choose.
Yes, roast beef is commonly eaten cold once it has been cooked and chilled safely. Thin slices work well in sandwiches, wraps and salads; keep leftovers refrigerated and avoid leaving them out for extended periods.
Cooked roast beef generally keeps for 3–4 days in a refrigerator set at 40°F (4°C) or below. Store it covered and refrigerate leftovers promptly rather than leaving them at room temperature.
Yes, roast beef freezes well, either as a whole piece or in portions. Wrap it tightly to limit air exposure, thaw it in the refrigerator, and use it soon after thawing for the best texture.
Reheat roast beef gently, covered, with a splash of stock or gravy to keep it moist. Low oven heat works for a larger piece; warm thin slices briefly in hot gravy rather than cooking them for a long time.
Roast beef is fresh beef cooked by roasting, while corned beef is cured in a seasoned brine before cooking. They have different flavours and textures, and corned beef is not simply another name for roast beef.
Roast beef pairs well with roasted potatoes, carrots, greens, Yorkshire pudding and gravy. For a lighter plate, serve it with a crisp salad or simply cooked vegetables and use the pan juices as a sauce.
Vitamins
B12
0.63µg · 26% DV
B3
2.16mg · 14% DV
B6
0.14mg · 8% DV
B2
0.05mg · 4% DV
Minerals
Zinc
1.44mg · 13% DV
Selenium
7.2µg · 13% DV
Phosphorus
66mg · 9% DV
Iron
0.78mg · 4% DV
Potassium ⭐
99mg · 3% DV
Sodium
17mg · 1% DV
GLYCEMIC INDEX
GLYCEMIC LOAD
Accounts for portion size — a more realistic measure than GI alone.
To burn the 51 calories in 1 slice (thin) (30 g):
🚶
Walking (5 km/h)
🏃
Running (8 km/h)
🚴
Cycling
🏊
Swimming
Times are calculated with the MET equation for a 70 kg adult. Actual burn varies with your weight, age and pace.
Roast beef is beef cooked as a joint, usually in an oven, then carved into slices. The outside develops a browned crust while the centre may remain rosy and juicy, depending on how it is cooked. It is served hot for a roast dinner in Britain and often eaten cold in sandwiches or as part of a deli plate in many English-speaking countries.
Its savoury flavour and tender, fibrous texture pair well with mustard, pickles and leafy greens. It is high in protein and contains virtually no carbohydrates, making it a substantial choice for a low-carb meal. For a lighter serving, layer a few slices into a salad or sandwich with plenty of vegetables.
High
How many vitamins, minerals and how much fiber this food carries per calorie. A high score means a lot of nutrition for few calories.
Medium
An EatBetter score computed from fiber, protein and calorie density. A high score means staying full longer on the same calories.
Both scores are calculated per 100 g and do not change with the selected portion. The satiety score is EatBetter's own calculation, not a clinical measure.
NOVA 2
Minimally Processed
1. Unprocessed
2. Minimally Processed
3. Processed
4. Ultra-Processed
NOVA classifies foods into 4 groups by industrial processing. NOVA 1 (unprocessed) is the healthiest.
No known major allergens
Vegan
— Not suitable
Vegetarian
— Not suitable
Gluten-Free
✓ Suitable
Dairy-Free
— Not suitable
Mediterranean
✓ Suitable
Paleo
✓ Suitable
Whole30
— Not suitable
DASH
— Not suitable
Keto
✓ Suitable
Low FODMAP
— Not suitable
SATURATED
0.66g
MONOUNSATURATED
0.75g
POLYUNSATURATED
0.08g
Omega 6:3 ratio 2.5:1
Below the ideal 4:1 — a good omega balance.
Ask the AI nutrition coach — calories, portions, alternatives and more, answered in seconds in the app.
Nutrition data compiled from USDA FoodData Central and scientific sources.