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Thinly sliced roast beef is arranged in overlapping folds on a plate, showing a browned outer crust, a moist rosy-pink center, fine meat fibers, and a few dark juices on the surface.
●Low GI
⚡High Potassium
💪High Protein

Roast beef Calories

Roasted beef; high in protein, very low in carbohydrates

CALORIES · 100 G

170kcal

GI

0low

POTASSIUM · 100 G

330mg

FIBER · 100 G

0g

Quick answer

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.

Roast beef Nutrition Facts

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%

Roast beef nutrition facts table · 1 slice (thin) (30 g)

NutrientAmount% DV
Calories51 kcal
Total fat1.8 g2%
Saturated fat0.66 g3%
Trans fat0.05 g
Sodium17 mg1%
Total carbohydrate0 g0%
Fiber0 g0%
Protein8.7 g17%

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.

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How Many Calories in 1 Thin Slice of Roast beef?

ServingAmountCalories
1 slice (thin)30 g51 kcal
1 slice (thin)20 g34 kcal
1 slice (medium)30 g51 kcal
1 slice (thick)45 g77 kcal
2 ounce (medium)56 g95 kcal
1 serving (small)85 g145 kcal
3 slice (medium)90 g153 kcal
100 g100 g170 kcal
1 serving (medium)120 g204 kcal
1 serving (large)180 g306 kcal
1 piece (whole)250 g425 kcal

Calculated from 170 calories per 100 g.

Frequently Asked Questions About Roast beef

What is roast beef?

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.

What cut of beef is best for roast beef?

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.

How do you cook roast beef in the oven?

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.

Is roast beef supposed to be pink in the middle?

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.

Can you eat roast beef cold?

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.

How long does cooked roast beef last in the fridge?

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.

Can you freeze roast beef?

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.

How do you reheat roast beef without drying it out?

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.

What is the difference between roast beef and corned beef?

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.

What should you serve with 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.

Roast beef Vitamins & Minerals

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

Roast beef Glycemic Index

GLYCEMIC INDEX

0
Low
0 Low5570100

GLYCEMIC LOAD

0
Low

Accounts for portion size — a more realistic measure than GI alone.

How to Burn Off Roast beef

To burn the 51 calories in 1 slice (thin) (30 g):

🚶

13min

Walking (5 km/h)

🏃

5min

Running (8 km/h)

🚴

7min

Cycling

🏊

6min

Swimming

Times are calculated with the MET equation for a 70 kg adult. Actual burn varies with your weight, age and pace.

What is Roast beef?

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.

How Nutritious Is Roast beef?

Nutrient density

High

72/ 100

How many vitamins, minerals and how much fiber this food carries per calorie. A high score means a lot of nutrition for few calories.

Satiety score

Medium

53/ 100

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.

Is Roast beef Processed?

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.

Does Roast beef Contain Allergens?

No known major allergens

Gluten free
Dairy free
Eggs free
Peanuts free
Tree nuts free
Fish free
Soy free
Sesame free

Which Diets Is Roast beef Good For?

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

Roast beef Fat Profile

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.

Compare Roast beef

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🍗

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Nutrition data compiled from USDA FoodData Central and scientific sources.