Calories in Zwieback

Instrument — Food Profile
100g
Calories

426.00

kcal
Protein

10.10

g
Carbs

74.20

g
Fat

9.70

g
Fiber

2.50

g
Sugar

12.50

g

Curious about the nutritional profile of zwieback? Whether you are tracking your macros or just want to know how many calories it contain, you are in the right place. A standard 100g serving of zwieback provides 426.00 calories, 10.10g of protein, and 74.20g of carbs.

Serving Size Variations

Portion Size Calories Protein Carbs Fat
100g (Standard) 426.00 kcal 10.10g 74.20g 9.70g
1 oz (28g) 119 kcal 2.8g 20.8g 2.7g
rusk (10g) 43 kcal 1.0g 7.4g 1.0g
piece (7g) 30 kcal 0.7g 5.2g 0.7g
oz (28g) 121 kcal 2.9g 21.0g 2.7g
toast, Gerber Zwieback (7g) 30 kcal 0.7g 5.2g 0.7g

Vitamins & Minerals

Nutrient Amount
Vitamin A 16.00 mcg
Vitamin C 5.30 mg
Vitamin E 2.44 mg
Vitamin K 0.90 mcg
Thiamin (B1) 0.21 mg
Riboflavin (B2) 0.24 mg
Niacin (B3) 1.32 mg
Pantothenic Acid (B5) 0.54 mg
Vitamin B6 0.08 mg
Folate (B9) 87.00 mcg
Calcium 20.00 mg
Iron 0.60 mg
Magnesium 14.00 mg
Potassium 305.00 mg
Sodium 227.00 mg
Zinc 0.54 mg
📊 Data Source: USDA FoodData Central Database (FDC ID: 171372)
🩺 Reviewed by Ashwini Yadav Last Updated: July 2026

Nutrition FAQs

How many calories is in zwieback?

100 grams of zwieback contains exactly 426.00 calories.

How many calories is in 1 piece of zwieback?

A single piece (7g) of zwieback provides 30 calories.

Does zwieback help build muscle?

It contains 10.10g of protein per 100g, which is moderate.

Is zwieback keto-friendly?

No, zwieback has 74.20g of carbs per 100g, which may disrupt ketosis.