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Calories in a Protein Shake

Q: How many calories in a protein shake?

1 scoop whey + water: ~120 calories, 24g protein. With whole milk: ~270 kcal, 32g protein. Commercial RTD: 150-220 kcal, 25-30g protein.

Updated July 2026 · Source: USDA FoodData Central

120

kcal

per 100g

20.0

Protein

2.5

Fat

8.0

Carbs

1.0

Fiber

120

kcal per shake with water (250ml)

270

kcal per shake with milk (300ml)

120

kcal per 100g

💪20-24g protein per serving — extremely efficient

🔥120 kcal per serving — best protein per calorie

😌Best protein-to-calorie ratio of any food

🥛With milk: 270 kcal, 30g protein

⚡Potassium — 400mg per 100g

🦴Calcium — 19% DV per serving

🍽 Calculate Calories for Any Amount of a Protein Shake

Weight100g

Nutrition Facts

Per 100g a protein shake

* % Daily Value based on a 2,000 kcal diet.

Quick summary: A standard protein shake (1 scoop whey + water, 250ml) contains approximately 120 calories with 20-24g protein — one of the highest protein-to-calorie ratios of any food. Extremely efficient for protein delivery. With milk: ~270 kcal, 30g protein. Supports muscle building, weight loss, and satiety.

Vitamins & Minerals — per 100g

Nutrient	Amount	% Daily Value
Protein	20g/serving	40%
Riboflavin	0.35mg	27%
Phosphorus	280mg	22%
Vitamin B12	0.6µg	25%
Calcium	200mg	19%
Magnesium	50mg	12%
Potassium	400mg	9%
Zinc	1.2mg	11%
Sodium	180mg	8%
Iron	0.5mg	3%

Calories in a Protein Shake by Weight

Weight	Calories	Protein	Net Carbs	Fat

Macronutrient Breakdown — per 100g

Fat2.5g · 19% of calories

Protein20.0g · 67% of calories

Carbohydrates8.0g · 27% of calories

Fiber1.0g · Net carbs: 7.0g

1 scoop (30g) whey + 220ml water = 120 kcal. With whole milk: +150 kcal. Premier Protein RTD: 160 kcal/30g protein. Fairlife: 150 kcal/30g protein. Values per 100g for comparison.

Key Nutrients

💪

Protein

20g/serving

40% DV

Complete protein — all 9 essential amino acids

🦴

Calcium

200mg

19% DV

From whey/milk

⚡

Potassium

400mg

9% DV

From whey and electrolytes

⚡

Magnesium

50mg

12% DV

From whey mineral

💊

Riboflavin

0.35mg

27% DV

From milk protein

⚡

Phosphorus

280mg

22% DV

From milk mineral

Protein Shake Benefits

Best Protein-to-Calorie Ratio

A whey protein shake (1 scoop + water, 120 kcal, 24g protein) offers the highest protein-to-calorie ratio of any practical food or beverage: 0.8g protein per calorie. For comparison: chicken breast (0.19g/kcal), eggs (0.13g/kcal), Greek yogurt (0.18g/kcal). For people in calorie deficit trying to preserve muscle, protein shakes are nutritionally unmatched.

Muscle Protein Synthesis — The Evidence

A 2020 meta-analysis of 49 RCTs found protein supplementation significantly increased muscle mass gains (+1.1kg) and strength during resistance training. The effect was equal for whey, casein, soy, and plant proteins when leucine content was matched — total protein intake matters more than protein source.

Weight Loss Support

Protein shakes support weight loss through multiple mechanisms: satiety (protein suppresses ghrelin more effectively than carbs or fat), thermogenic effect (protein requires 25-30% of its calories for metabolism), and muscle preservation (preventing muscle loss during calorie restriction).

Convenience — The Real Value

The primary advantage over whole food protein is convenience: 2 minutes to prepare, easily portable, reliable protein content. For busy people struggling to prepare high-protein meals, protein shakes remove the primary barrier to meeting protein needs — and dietary compliance is more important than marginal differences in protein quality.

Compare a Protein Shake Calories

Is a Protein Shake Suitable for Your Diet?

✅

Weight loss

Excellent — 120 kcal, 24g protein

✅

Keto

Yes — minimal carbs with water

❌

Paleo

No — processed dairy

✅

Gluten-free

Yes — check label

✅

Diabetic

Yes — low carb, high protein

❌

Vegan

No — whey from dairy

✅

Vegetarian

Yes

✅

Athletes

Post-workout recovery

Related Calculators

Frequently Asked Questions

How many calories in a protein shake?

1 scoop whey + water: ~120 calories, 24g protein. With whole milk: ~270 kcal, 32g protein. Commercial RTD: 150-220 kcal, 25-30g protein.

Is a protein shake a meal replacement?

A basic shake (120 kcal) is not — it lacks fat, fiber, and micronutrients of a complete meal. A protein smoothie with fruit, nut butter, and vegetables (400-500 kcal) can function as a meal replacement.

When should you drink a protein shake?

Post-workout (within 30-60 minutes) to maximise muscle protein synthesis. Between meals as a high-protein snack. Before bed (casein-based) for overnight muscle recovery.

Are protein shakes necessary?

Only if you struggle to meet protein targets through food alone. Many people consuming adequate whole food protein gain no additional benefit from supplementation.

Can you lose weight with protein shakes?

Yes — replacing a high-calorie meal with a 120-270 kcal protein shake reduces calorie intake while preserving satiety and muscle mass. Multiple RCTs show protein shake-supplemented calorie restriction produces greater fat loss.

Are protein shakes bad for kidneys?

No — not in people with healthy kidneys. Multiple large reviews confirm no kidney damage from high protein intake in healthy adults.

Sources

Nutrition values from USDA FoodData Central. Not medical advice.