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Last updated: Aug 9, 2026

Port of Subs

Barq's Root Beer - 21 fl oz

Beverages - Fountain 21 fl ozPopular

Port of Subs Barq's Root Beer - 21 fl oz is carb-leaning, with about 100% of macro calories from carb. Each serving has 305 calories, 0g protein, 76.4g carbs, and 0g fat, making it a lighter restaurant option to compare with larger meals.

21 Fl oz

Serving Size

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305

Calories

Per serving

0 g

Protein

76.4 g

Carbs

0 g

Fat

Nutrition Facts

Amount per serving

Calories305 kcal

% Daily Value*

Total Fat 0 g0%

Saturated Fat 0 g0%

Trans Fat 0 g—

Cholesterol 0 mg0%

Sodium 91 mg4%

Total Carbohydrate 76.4 g28%

Dietary Fiber 0 g0%

Total Sugars 76.4 g—

Protein 0 g0%

Vitamin A—

Vitamin C—

Vitamin D—

Calcium—

Iron—

Potassium—

Caffeine—

* The % Daily Value tells you how much a nutrient in a serving contributes to a daily diet.

Nutrition Breakdown

305

kcal

Protein0 g (0%)

Carbs76.4 g (100%)

Fat0 g (0%)

Estimated calorie contribution using 4 kcal/g for protein and carbohydrates and 9 kcal/g for fat.

Meal Planning Insights

Protein density0/10

0% of macro calories come from protein.

Satiety index1.3/10

Estimated from protein, fiber, calories, and fat balance.

Activity estimate76 min walk

About 31 minutes of running for these calories.

Key Nutrients

Protein 0 g0%

Fiber 0 g0%

Sodium 91 mg4%

Sugars 76.4 g—

Saturated Fat 0 g0%

How we calculate these values

Diet Compatibility

High protein0/10 protein density from 0g protein and 305 calories.No

Lower carb76.4g carbs per serving.No

Low fat0g total fat per serving.Yes

High sugar76.4g total sugars per serving.Yes

High sodium91mg sodium per serving.No

Vegetarian source flagNo vegetarian flag is published for this item.Not flagged

Ingredients

Ingredient Statement For Syrup | High Fructose Corn Syrup, Water, Caramel Color, Sodium Benzoate (To Protect Taste), Citric Acid, Caffeine, Artificial And Natural Flavors, Acacia. Ingredient Statement For Beverage | Carbonated Water, High Fructose Corn Syrup,…

Similar Items in Beverages - Fountain 21 fl oz

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A&W Root Beer - 21 fl oz305 kcal · 0 g protein

Compare with other items

Select up to 3 items to compare calories, protein, sodium, and macros.

Quick comparisons

Barq's Root Beer - 21 fl oz has 3893 fewer calories than 2-Foot Brookie in a Box and 33.2g less protein. Compare

Barq's Root Beer - 21 fl oz has 2893 fewer calories than 2-Foot Brownie in a Box and 23.2g less protein. Compare

2-Foot Brookie in a Box4,199 kcal · 33.2 g protein2-Foot Brownie in a Box3,199 kcal · 23.2 g protein2-Foot Classic Sub Macaroni Salad Center3,815 kcal · 163.6 g protein2-Foot Classic Sub Potato Salad Center3,248 kcal · 158 g protein2-Foot Cookie in a Box3,000 kcal · 30 g protein4x4 Brookie954 kcal · 7.4 g protein

Compare with 2-Foot Brookie in a Box

Barq's Root Beer - 21 fl oz Compared With Nearby Items

Compared with A&W Root Beer - 21 fl oz, another Beverages - Fountain 21 fl oz item at Port of Subs, Barq's Root Beer - 21 fl oz has the same calories as it and the same protein as it. That makes this page useful for deciding between nearby menu choices, not just reading a raw nutrition label.

Data Source and Methodology

Nutrition values for Barq's Root Beer - 21 fl oz are maintained in Nutrimetry from restaurant-published menu data and were last checked on Aug 9, 2026. Macro percentages use 4 calories per gram for protein and carbohydrates and 9 calories per gram for fat.

Read the data methodology

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