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Onion (Small) Calories
Low calorie, source of fiber, contains vitamin C
CALORIES
GI
POTASSIUM
FIBER
Onion (Small) Nutrition Facts
Selected: 100 g
40
KCAL / 100G
Carbs
9.3g
· 88%
Protein
1.1g
· 10%
Fat
0.1g
· 2%
Fiber
1.7g
Onion (Small) Vitamins & Minerals
Vitamins
Vitamin C
7.4mg · 8% DV
B6
0.12mg · 7% DV
Folate
19µg · 5% DV
B1
0.04mg · 3% DV
Minerals
Phosphorus
29mg · 4% DV
Potassium ⭐
146mg · 4% DV
Calcium
23mg · 2% DV
Magnesium
10mg · 2% DV
Onion (Small) Glycemic Index
GLYCEMIC INDEX
GLYCEMIC LOAD
Accounts for portion size — a more realistic measure than GI alone.
Is Onion (Small) Processed?
NOVA 1
Unprocessed
1. Unprocessed
2. Minimally Processed
3. Processed
4. Ultra-Processed
NOVA classifies foods into 4 groups by industrial processing. NOVA 1 (unprocessed) is the healthiest.
Does Onion (Small) Contain Allergens?
No known major allergens
Which Diets Is Onion (Small) Good For?
Vegan
✓ Suitable
Vegetarian
✓ Suitable
Gluten-Free
✓ Suitable
Dairy-Free
— Not suitable
Mediterranean
✓ Suitable
Paleo
✓ Suitable
Whole30
— Not suitable
DASH
— Not suitable
Keto
✓ Suitable
Low FODMAP
— Not suitable
Onion (Small) Fat Profile
SATURATED
0.03g
MONOUNSATURATED
0.01g
POLYUNSATURATED
0.02g
Omega 6:3 ratio 2:1
Below the ideal 4:1 — a good omega balance.
Foods Similar to Onion (Small)
Onion (Small) — Frequently Asked Questions
How many calories and carbs are in a small onion?
Onion contains 40 calories and 9.3 g of carbohydrates per 100 g. It also provides 1.1 g of protein, 0.1 g of fat, and 1.7 g of fiber.
Is onion keto-friendly, and what is its glycemic index?
Onion is listed as compatible with a keto diet. Its glycemic index is 15, which is considered low.
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Nutrition data compiled from USDA FoodData Central and scientific sources.