How Much Fiber Is in a Sweet Potato? (And Why It Matters)
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If you're wondering how much fiber is in a sweet potato, the short answer is about 4 grams in a medium one (roughly 130g, with the skin), or close to 3 grams per 100g. That makes the humble sweet potato one of the easier, tastier ways to move toward the 25 to 38 grams of fiber most adults need each day.
How Much Fiber Is in a Sweet Potato? (Exact Numbers)
Fiber content shifts a little with size and whether you keep the skin on. Typical values for a cooked sweet potato:
| Serving | Approx. Weight | Fiber |
|---|---|---|
| Per 100g | 100g | ~3g |
| Medium, with skin | ~130g | ~4g |
| Large, with skin | ~180g | ~5.5g |
| 1 cup, mashed | ~200-250g | ~6.5g |
Keep the skin on and you keep more of the fiber. Peeling a sweet potato can cut its fiber by roughly a third, so that thin skin is doing real work.
Soluble vs. Insoluble Fiber in Sweet Potatoes
Sweet potatoes give you both kinds of fiber, and each does something different:
- Soluble fiber dissolves into a gel that slows digestion, helps steady blood sugar, and feeds the good bacteria in your gut.
- Insoluble fiber adds bulk and helps keep things moving through your digestive tract.
Most of the fiber sits in and just under the skin, which is one more reason to eat it whole rather than peeled.
Why Sweet Potato Fiber Matters
Fullness that lasts
Fiber slows how quickly you digest a meal, which is part of why a fiber-rich carb like sweet potato tends to satisfy longer than a refined one. That is the difference between a snack that holds you and one that leaves you hungry an hour later.
Steadier energy
Because fiber slows the release of the natural sugars in a sweet potato, you get a more gradual rise in blood sugar than you would from a low-fiber, refined food. Portion and preparation still matter, but the fiber helps.
Digestive and gut health
A diet built on fiber-containing whole foods is associated with better regularity and a healthier gut microbiome. Sweet potatoes are an easy, everyday way to add to your total.
Does Cooking Change the Fiber?
Not much. Baking, boiling, and roasting keep the fiber roughly intact; the bigger swings come from whether you keep the skin and how large your portion is. Boiling may make the fiber a touch gentler on digestion, while roasting concentrates flavor. Either way, you are still getting most of that 4 grams.
Easy Ways to Get More Sweet Potato Fiber
- Leave the skin on when you bake or roast.
- Roast in cubes and add them to grain bowls, salads, and soups.
- Pair with beans or lentils for a double dose of fiber and plant protein. (More on that in our guide to sweet potato protein.)
- Snack on chewy dried sweet potato sticks when you want the fiber in a grab-and-go form.
Frequently Asked Questions
Is a sweet potato high in fiber?
It is a good source. About 4 grams in a medium sweet potato covers a meaningful share of the daily target, especially when you keep the skin on.
Which has more fiber, sweet potato or white potato?
They are close, but sweet potatoes usually edge ahead, and they add beta-carotene (vitamin A) that white potatoes lack.
Does sweet potato skin have fiber?
Yes, a lot of it. Much of the fiber is in and just under the skin, so eating it whole gives you the most.
A Chewy, Fiber-Rich Snack
Want sweet potato fiber in a form you can toss in a bag? Yammy chewy dried sweet potato sticks deliver 4g of fiber and 3g of protein per serving, made from real sweet potato and naturally vegan and gluten-free. For the full rundown on this root vegetable, see our complete guide to sweet potatoes.