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Last updated: Aug 9, 2026

Port of Subs

Diet Dr Pepper - 21 fl oz

Beverages - Fountain 21 fl ozPopular

Port of Subs Diet Dr Pepper - 21 fl oz has a relatively balanced macro split: 0% protein, 0% carbs, and 0% fat. Each serving has 0 calories, 0g protein, 0g carbs, and 0g fat, making it a lighter restaurant option to compare with larger meals.

21 Fl oz

Serving Size

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Calories

Per serving

0 g

Protein

0 g

Carbs

0 g

Fat

Nutrition Facts

Amount per serving

Calories0 kcal

% Daily Value*

Total Fat 0 g0%

Saturated Fat 0 g0%

Trans Fat 0 g—

Cholesterol 0 mg0%

Sodium 124 mg5%

Total Carbohydrate 0 g0%

Dietary Fiber 0 g0%

Total Sugars 0 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

kcal

Protein0 g (0%)

Carbs0 g (0%)

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 index3/10

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

Activity estimate1 min walk

About 1 minutes of running for this calorie total.

Key Nutrients

Protein 0 g0%

Fiber 0 g0%

Sodium 124 mg5%

Sugars 0 g—

Saturated Fat 0 g0%

How we calculate these values

Diet Compatibility

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

Lower carb0g carbs per serving.Yes

Low fat0g total fat per serving.Yes

High sugar0g total sugars per serving.No

High sodium124mg sodium per serving.No

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

Ingredients

Syrup Ingredients: Water, Caramel Color, Phosphoric Acid, Aspartame, Sodium Citrate, Sodium Benzoate (Preservative), Caffeine, Acesulfame Potassium, Sucralose, Natural And Artificial Flavors, Dimethylpolysiloxane.

Similar Items in Beverages - Fountain 21 fl oz

View all

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

Diet Dr Pepper - 21 fl oz has 4199 fewer calories than 2-Foot Brookie in a Box and 33.2g less protein. Compare

Diet Dr Pepper - 21 fl oz has 3199 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

Diet Dr Pepper - 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, Diet Dr Pepper - 21 fl oz has 305 fewer calories than 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 Diet Dr Pepper - 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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