USDA-derived comparison
Soybeans vs Tofu (firm)
Soybeans leads for Iron, Phosphorus and Protein; Tofu (firm) answers with Calcium.
Who each is for: Choose soybeans for iron and phosphorus. Choose tofu (firm) for calcium.
Reviewed 20 July 2026. Generic food data per 100g; brands and preparation vary.
Soybeans
Typical serving: half a cup (90g)
18/100
Side by side, per 100g
The stronger number is highlighted, honestly: higher wins for aim-for nutrients, lower wins for stay-under ones like saturated fat and sodium.
| Nutrient | Soybeans | Tofu (firm) |
|---|---|---|
| Calories | 172 kcal | 98 kcal |
| Protein | 18 g | 11 g |
| Carbs | 8 g | 2 g |
| Fat | 9 g | 5 g |
| Fiber | 6 g | 1 g |
| Sat fat | 1 g | 1 g |
| Sodium | 1 mg | 12 mg |
| Potassium | 515 mg | 148 mg |
| Calcium | 102 mg | 350 mg |
| Iron | 5.1 mg | 1.6 mg |
| Magnesium | 86 mg | 37 mg |
| Zinc | 1.2 mg | 0.8 mg |
| Vitamin C | 2 mg | 0 mg |
| Vitamin D | 0 µg | 0 µg |
| Vitamin B12 | 0 µg | 0 µg |
| Folate | 54 µg | 19 µg |
Servings differ: half a cup of soybeans is about 90g, 1 serving of tofu (firm) about 126g. Scale accordingly before deciding anything on the 100g basis alone.
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