How Many Calories Are In 1 Scoop of Serious Mass Gainer?

November 21, 2025 •

3 min read

Based on the official nutritional information, a full 2-scoop serving of Serious Mass contains over 1,250 calories, meaning one scoop contains approximately 625-630 calories. This detailed guide breaks down exactly how many calories are in 1 scoop of Serious Mass Gainer and what that means for your bulking goals.

Quick Summary

One scoop of Optimum Nutrition Serious Mass provides roughly 625-630 calories, representing a half-serving of the high-calorie weight gain supplement. This offers a convenient way to boost your daily caloric intake.

Key Points

Single Scoop Calories: One heaping scoop of Serious Mass contains approximately 625-630 calories, a half-serving of the supplement.
Full Serving Size: The standard recommended serving is two heaping scoops, which provides 1,250-1,260 calories.
Macronutrient Content: A single scoop contains about 25g of protein and 125g of carbohydrates.
Customizable Intake: The 1-scoop option is ideal for beginners, those managing calorie intake, or for multiple servings per day.
Adding Calories: Mixing with milk or adding ingredients like nut butter and fruits will significantly increase the overall caloric content of your shake.
Weight Gain Requires Consistency: For significant weight gain, a full serving combined with intense weight training and a high-calorie diet is often recommended.

The Quick Answer: Calories Per Scoop

For Optimum Nutrition Serious Mass, one heaping scoop, which is a half-serving, contains approximately 625-630 calories. The manufacturer’s official serving size is two scoops, which delivers the full caloric value of 1,250 to 1,260 calories. New users and those looking for a lower calorie boost are often advised to start with this half-serving amount.

Serious Mass Serving Sizes Explained

Understanding the standard serving is crucial for accurate calorie tracking. Serious Mass is designed to provide a massive caloric and nutritional punch for individuals with high metabolic rates who struggle to gain weight from food alone.

The Official 2-Scoop Serving

The full, recommended serving is about 334–340 grams of powder, or two heaping scoops. When mixed with water, this full serving provides:

Calories: 1,250 to 1,260
Protein: 50 grams from a blended protein source
Carbohydrates: Over 250 grams
Fat: Less than 5 grams
Added Nutrients: Includes creatine, glutamine, and various vitamins and minerals

The 1-Scoop (Half) Serving

For those who find the full serving too large or want to spread their calorie intake throughout the day, one scoop (about 167 grams) is the ideal starting point. A single scoop, when mixed with water, provides:

Calories: Approximately 625-630
Protein: 25 grams
Carbohydrates: Roughly 125 grams

Comparison Table: 1 Scoop vs. 2 Scoops


Nutrient	1 Scoop (Half Serving)	2 Scoops (Full Serving)	Reference
Calories	~625-630 kcal	1,250-1,260 kcal	,
Protein	25 g	50 g	,
Carbohydrates	~125 g	>250 g	,
Fat	<2.5 g	<5 g
Creatine	~2.5 g	5 g

Optimizing Your Serious Mass Shake

While the baseline nutritional values are important, your choice of liquid and additional ingredients can significantly alter the final calorie count.

Impact of Liquid Choice

Water: Mixing with cold water provides the baseline calorie counts as listed above. This is the lowest-calorie option for preparing your shake.
Milk: Mixing with milk substantially increases the calories, protein, and fat. For example, using whole milk instead of water can add several hundred extra calories to your shake.

Boosting Calories with Additional Ingredients

One of the benefits of Serious Mass is its versatility, allowing you to create a customized shake to meet your specific weight gain targets. Here are some popular additions to boost your calorie count even further:

Peanut Butter or Almond Butter: A couple of tablespoons can add over 200 calories and healthy fats.
Fruits: Adding a banana or a cup of berries provides extra carbs, vitamins, and fiber.
Oats: Blending in a half-cup of rolled oats can add complex carbohydrates and fiber.
Yogurt or Ice Cream: Mixing with full-fat yogurt or ice cream turns your shake into a rich, calorie-dense dessert.
MCT Oil: Adding a tablespoon of Medium Chain Triglyceride (MCT) oil is a way to get extra calories from fat.

How to Determine the Right Serving Size for You

Your ideal serving size depends on several factors, including your metabolism, current diet, and fitness goals. Using a single scoop is a great strategy for several situations.

When to Consider a Single Scoop

For Beginners: If your body isn't accustomed to high-calorie supplements, starting with a half-serving can help your digestive system adjust and prevent bloating.
As a Caloric 'Top-Off': A single scoop works well as a post-workout recovery drink or a between-meal snack to add a moderate boost of calories and nutrients to an already solid diet.
To Spread Intake: Spreading your intake throughout the day with two half-servings can help maintain a positive nitrogen balance and provide a steady stream of nutrients to your muscles.

Is One Scoop Enough to Gain Weight?

Whether one scoop is sufficient for weight gain is highly individual. For some, especially those with a moderately active metabolism, one scoop on top of a regular, calorie-surplus diet might be enough to see progress. However, for serious ectomorphs or athletes with very high metabolic rates, a full two-scoop serving is likely necessary to achieve significant weight gain.

Conclusion: Finding the Right Serious Mass Intake

While the definitive answer to how many calories are in 1 scoop of Serious Mass Gainer is approximately 625-630, the real takeaway is that your serving size should align with your personal needs. For beginners, a single scoop is a great way to start and test tolerance, while more advanced users or those with higher caloric needs will likely benefit from the full, recommended two-scoop serving. By understanding the nutritional breakdown and how to customize your shake, you can effectively use Serious Mass to achieve your specific muscle-building and weight-gain objectives. For more information on the product, you can visit the official Optimum Nutrition Serious Mass page.

Frequently Asked Questions

A full, standard serving of Optimum Nutrition Serious Mass consists of two heaping scoops.

The calorie count listed on the Serious Mass packaging is for a serving mixed with water. Mixing with milk adds additional calories, protein, and fat, which varies depending on the type of milk used.

No, new users are advised to begin with a half-serving (one scoop) to assess tolerance and allow their digestive system to adjust to the high-calorie formula.

One scoop (a half-serving) of Serious Mass provides approximately 25 grams of protein.

Serious Mass is designed to supplement your diet, not replace meals entirely. It is best used to add calories between meals or as a post-workout shake.

For an even bigger calorie boost, you can blend in other high-calorie foods like peanut butter, fruits, ice cream, or oats.

For some individuals with moderate caloric needs, one scoop combined with a proper diet might contribute to weight gain. However, for those with very high metabolisms, a full two-scoop serving is often necessary.