A medium baked potato (about 173 grams) with the skin on contains roughly 3.6 grams of fiber. That’s about 13% of the recommended daily intake for someone eating a 2,000-calorie diet. The exact amount shifts depending on the potato’s size, variety, and whether you eat the skin.
Fiber by Size and Skin
Per 100 grams of white potato with skin, you get about 2.1 grams of fiber. Scale that up to common serving sizes and the numbers look like this:
- Small baked potato (138 g): about 2.9 grams of fiber
- Medium baked potato (173 g): about 3.6 grams of fiber
- Large baked potato (299 g): about 6.3 grams of fiber
The skin matters more than most people realize. Potato skin is disproportionately rich in insoluble fiber, the kind that adds bulk and helps move food through your digestive tract. The flesh, by contrast, has a higher ratio of soluble fiber to insoluble fiber. Soluble fiber dissolves in water and helps slow digestion, which can moderate blood sugar spikes after a meal. If you peel your baked potato, you lose a meaningful chunk of the total fiber, roughly a third of it, and you lose most of the insoluble fiber specifically.
How Baked Potatoes Compare to Other Foods
Current dietary guidelines recommend 14 grams of fiber for every 1,000 calories you eat. For most adults, that works out to somewhere between 25 and 35 grams per day. A medium baked potato gets you about 10 to 14% of the way there, which puts it solidly in the “good source” category but not at the top of the fiber chart.
Sweet potatoes have a clear edge. Per 100 grams with skin, a sweet potato delivers 3.3 grams of fiber compared to 2.1 grams for a white potato. That’s roughly 57% more fiber at the same weight. Legumes like lentils and black beans outpace both, often landing above 7 grams per 100-gram serving. But among starchy side dishes, potatoes hold their own. A cup of cooked white rice has about 0.6 grams of fiber, and white pasta sits around 1.8 grams per 100 grams. A baked potato beats both easily.
Resistant Starch: The Hidden Fiber Bonus
Baked potatoes contain resistant starch, a type of starch that behaves like fiber in your gut. Your small intestine can’t break it down, so it passes to the large intestine where gut bacteria ferment it. This fermentation produces short-chain fatty acids that feed the cells lining your colon.
The amount of resistant starch in your potato depends heavily on how you serve it. A hot baked potato straight from the oven has less resistant starch than one that’s been cooled. When cooked starch cools, its structure tightens up in a process called retrogradation, making it harder to digest. Chilled baked potatoes contain the most resistant starch, followed by potatoes that were chilled and then reheated. Hot potatoes have the least. Baking also produces more resistant starch than boiling, regardless of temperature at serving.
So if you eat leftover baked potato in a cold salad the next day, you’re getting more total fiber-like benefit than you would from a freshly baked one. Even reheating a previously chilled potato retains more resistant starch than a potato that was never cooled.
Why Potatoes Keep You Full
Fiber is part of the reason baked potatoes feel so satisfying, but it’s not the whole story. In a well-known study from the European Journal of Clinical Nutrition, researchers measured how full people felt after eating equal-calorie portions of 38 common foods. Boiled potatoes scored 323% on the satiety index, using white bread as the baseline at 100%. That made potatoes the single most filling food tested, more than three times as satiating as white bread and roughly seven times more filling than a croissant.
For comparison, white rice scored 138%, brown rice 132%, and whole meal bread 157%. Potatoes’ combination of fiber, water content, and volume gives them an unusual ability to suppress hunger relative to their calorie count. A medium baked potato has only about 160 calories, so pairing that with its high satiety score makes it one of the more efficient ways to feel full on fewer calories.
Getting the Most Fiber From Your Potato
A few simple choices can maximize what you get out of a baked potato’s fiber content. Eating the skin is the single biggest factor. Choose larger potatoes if fiber is a priority, since the total grams scale directly with size. Letting your baked potato cool before eating, or eating it as leftovers, increases the resistant starch content.
Topping choices matter too. Adding beans, broccoli, or other high-fiber toppings can turn a baked potato into a meal that delivers 8 to 10 grams of fiber or more. Loading it with butter and sour cream won’t reduce the fiber, but it will change the calorie math considerably. A baked potato topped with black beans and salsa is a genuinely high-fiber meal. One buried under cheese and bacon is a different nutritional proposition, even though the potato underneath is identical.