How much fiber is in onions, raw?

One medium (2-1/2" dia) of Onions, raw has 1.9g of fiber, which is 6% of the recommended 30g daily intake. Per 100g, it contains 1.7g of fiber.

Is onions, raw high in fiber?

Onions, raw is a moderate source of fiber in vegetables and vegetable products, ranked #378 out of 536 foods in its category. Each serving provides 6% of your daily 30g fiber goal.

Does onions, raw have soluble or insoluble fiber?

Per 100g, onions, raw contains 1.0g of soluble fiber and 0.7g of insoluble fiber. It's predominantly soluble fiber, which helps lower cholesterol and regulate blood sugar.

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Onions, raw

6% daily fiber

1.9g of fiber per medium (2-1/2" dia)

Daily goal (30g ⓘ) 6%

Low fiber. You'd need 16 servings to reach 30g. Not a fiber food.

Fiber Breakdown per 100g

1.7g / 100g

1.0g soluble

0.7g insoluble

Soluble — feeds gut bacteria Insoluble — keeps things moving

Estimated from published research — actual values vary by variety and preparation.

Per Serving

1.9g

1 medium (2-1/2" dia)

Calories

40kcal

per 100g

Fiber / 100cal

4.2g

satiety metric

Category Rank

#378/ 536

Rank in Vegetables and Vegetable Products

Least fiber Most fiber

Onions, raw & Fiber

A medium (2-1/2" dia) of onions, raw provides 1.9g of dietary fiber along with 40 calories per 100g. That's 4.2g of fiber per 100 calories — an efficient way to add fiber without excess calories.

The fiber splits into 1.0g soluble and 0.7g insoluble per 100g. The higher soluble fiber content may help with blood sugar regulation and cholesterol.

With 1.1g of protein per 100g, onions, raw also contributes to satiety alongside its fiber content.