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Last updated: Aug 9, 2026

Firehouse Subs

Au Jus Mushrooms

Small Sub ToppingsPopular

Firehouse Subs Au Jus Mushrooms is carb-leaning, with about 56% of macro calories from carb. Each serving has 2 calories, 0.3g protein, 0.4g carbs, and 0g fat, making it a lighter restaurant option to compare with larger meals.

0.4 Ounces

Serving Size

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Calories

Per serving

0.3 g

Protein

0.4 g

Carbs

0 g

Fat

Nutrition Facts

Amount per serving

Calories2 kcal

% Daily Value*

Total Fat 0 g0%

Saturated Fat 0 g0%

Trans Fat 0 g—

Cholesterol 0 mg0%

Sodium 59 mg3%

Total Carbohydrate 0.4 g0%

Dietary Fiber 0.3 g1%

Total Sugars 0 g—

Protein 0.3 g1%

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

Protein0.3 g (35%)

Carbs0.4 g (56%)

Fat0 g (9%)

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

Meal Planning Insights

Protein density10/10

35% of macro calories come from protein.

Satiety index3.4/10

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

Activity estimate1 min walk

About 1 minutes of running for this calorie total.

Key Nutrients

Protein 0.3 g1%

Fiber 0.3 g1%

Sodium 59 mg3%

Sugars 0 g—

Saturated Fat 0 g0%

How we calculate these values

Diet Compatibility

High protein10/10 protein density from 0.3g protein and 2 calories.Yes

Lower carb0.4g carbs per serving.Yes

Low fat0g total fat per serving.Yes

High sugar0g total sugars per serving.No

High sodium59mg sodium per serving.No

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

Ingredients

MUSHROOMS, VEGETARIAN WORCESTERSHIRE SAUCE (WATER, GLUCOSE SYRUP, VINEGAR, HYDROLYZED RAPESEED PROTEIN, SALT, SUGAR, NATURAL FLAVORINGS, CARAMEL [FOR COLOR], SPICES, CITRIC ACID, GARLIC EXTRACT, ONION, HERBS), SALT, GARLIC EXTRACT. MAY CONTAIN FISH, SOY AND…

Allergens

Contains

Soy

Similar Items in Small Sub Toppings

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Au Jus Bell Peppers2 kcal · 0.1 g protein

Compare with other items

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

Quick comparisons

Au Jus Mushrooms has 148 fewer calories than 1% Chocolate Milk and 6.7g less protein. Compare

Au Jus Mushrooms has 88 fewer calories than 1% Milk and 6.7g less protein. Compare

1% Chocolate Milk150 kcal · 7 g protein1% Milk90 kcal · 7 g protein5-Cheese Mac & Cheese380 kcal · 17 g proteinApple Juice100 kcal · 0 g proteinAu Jus Bell Peppers5 kcal · 0.2 g proteinAu Jus Bell Peppers3 kcal · 0.1 g protein

Compare with 1% Chocolate Milk

Au Jus Mushrooms Compared With Nearby Items

Compared with Au Jus Bell Peppers, another Small Sub Toppings item at Firehouse Subs, Au Jus Mushrooms has the same calories as it and 0.2g more protein than 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 Au Jus Mushrooms 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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