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Onions Calories
Source of vitamin C, low calorie, fibrous vegetable
CALORIES
GI
POTASSIUM
FIBER
Onions Nutrition Facts
Selected: 100 g
40
KCAL / 100G
Carbs
9.3g
· 88%
Protein
1.1g
· 10%
Fat
0.1g
· 2%
Fiber
1.7g
Onions 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
Onions Glycemic Index
GLYCEMIC INDEX
GLYCEMIC LOAD
Accounts for portion size — a more realistic measure than GI alone.
Is Onions 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 Onions Contain Allergens?
No known major allergens
Which Diets Is Onions 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
Onions Fat Profile
SATURATED
0.03g
MONOUNSATURATED
0.01g
POLYUNSATURATED
0.02g
Omega 6:3 ratio 1:1
Below the ideal 4:1 — a good omega balance.
Foods Similar to Onions
Onions — Frequently Asked Questions
How many calories are in onions?
Onions provide 40 calories per 100 g. The same serving contains 9.3 g of carbohydrates, 1.1 g of protein, and 0.1 g of fat.
Are onions low glycemic?
Yes, onions have a glycemic index of 15, which is low. They also provide 1.7 g of fiber per 100 g.
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Nutrition data compiled from USDA FoodData Central and scientific sources.