Onion vs Tomato
Complete nutrition comparison per 100g serving
Which is Healthier?
Onion is generally healthier
Onion comes out ahead in this comparison, winning in 3 out of 5 key nutritional categories. It has more protein (1.1g vs 0.9g), more fiber (1.7g vs 1.2g), less sodium (4mg vs 5mg)making it the better choice for most health goals.
Quick Summary
Fewer Calories
Tomato
18 kcal
More Protein
Onion
1.1g
More Fiber
Onion
1.7g
Less Sugar
Tomato
2.6g
Visual Comparison
Caloriesper 100g
Onion
40
Tomato
18
Proteinper 100g
Onion
1.1g
Tomato
0.9g
Carbohydratesper 100g
Onion
9g
Tomato
4g
Fatper 100g
Onion
0.1g
Tomato
0.2g
Side-by-Side Nutrition Table
Serving Size Comparison
All values above are per 100g. Here's how they compare in common serving sizes:
Onion
Per 100g:40 calories
Per cup (150g):60 calories
Per serving (85g):34 calories
Tomato
Per 100g:18 calories
Per cup (150g):27 calories
Per serving (85g):15 calories
Diet Compatibility
Onion
Low-CarbLow-CalorieVeganVegetarianPaleoLow-Sodium
Tomato
Low-CarbLow-CalorieVeganVegetarianPaleoLow-Sodium
When to Choose Onion
- ✓Higher in protein (1.1g vs 0.9g)
- ✓More fiber (1.7g vs 1.2g)
- ✓Lower sodium (4mg vs 5mg)
Common Uses
SaladsStir-friesRoasted sidesSoups
When to Choose Tomato
- ✓Lower in calories (18 vs 40)
- ✓Lower in carbs (4g vs 9g)
- ✓Less sugar (2.6g vs 4.2g)
Common Uses
SaladsStir-friesRoasted sidesSoups