Data last updated: April 2026

Black Bean vs Onion

Nutrition Comparison per 100g

Black Bean 7
vs
3 Onion

Legumes & Soy vs Vegetables

Side-by-Side Nutrition Facts

Nutrient Black Bean Onion Better
Calories 132kcal 40kcal Onion
Protein 8.9g 1.1g Black Bean
Total Fat 0.5g 0.1g Onion
Carbohydrates 23.7g 9.3g Black Bean
Fiber 8.7g 1.7g Black Bean
Sugar 0.3g 4.2g Black Bean
Vitamin C 0mg 7.4mg Onion
Calcium 27mg 23mg Black Bean
Iron 2.1mg 0.2mg Black Bean
Potassium 355mg 146mg Black Bean

Macronutrient Breakdown

Black Bean

Protein: 8.9g Fat: 0.5g Carbs: 23.7g

Onion

Protein: 1.1g Fat: 0.1g Carbs: 9.3g

Data Source

Nutrition data sourced from the USDA FoodData Central SR Legacy database. All values are per 100g of the food item. Actual nutritional content may vary by preparation method, brand, and serving size.

Black Bean vs Onion — Key Takeaway

Onion has 92 fewer calories per 100g than Black Bean, making it the lighter option. For protein, Black Bean leads with 8.9g per 100g. Black Bean is the better source of fiber at 8.7g per 100g.

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