Sweet potato vs white potato: the real nutritional difference

Few food matchups carry as much baggage as sweet potato vs white potato. The sweet potato has spent two decades as the darling of health writers, while the white potato got lumped in with fries and chips and quietly written off as junk. Our data tells a more interesting story. Both are strong performers. One has a single spectacular advantage, and the gap everywhere else is smaller than most people think.

In the NutriVerdict index, sweet potato, raw earns a Nutrient Density Score of 91 out of 100, and potatoes, flesh and skin, raw score 83. That is a real difference, but it is the difference between an excellent food and a very good one, not between a superfood and a snack. Here is where those eight points actually come from.

Vitamin A: the one blowout

This is the category that decides the matchup. Per 100 grams, sweet potato delivers 709 micrograms of vitamin A, driven by the beta-carotene that gives the flesh its orange color. The white potato delivers zero. Not a little less. Zero.

For context, 709 micrograms is a large share of the daily value for vitamin A in a portion smaller than one medium sweet potato. If vitamin A is a nutrient you care about covering through food, the sweet potato is one of the most efficient sources in our entire vegetable database, which is why it carries the vitamin-a-rich tag on its food page. This single nutrient is the main reason the sweet potato scores higher overall.

Potassium: closer than you think, and the white potato wins

Here is the part that surprises people. The white potato is the better potassium source. Per 100 grams, potatoes with flesh and skin carry 425 milligrams of potassium against the sweet potato's 337 milligrams. Both are solid contributions, but if you picked the sweet potato specifically for potassium, you picked the wrong tuber.

The white potato also brings a vitamin C surprise: 19.7 milligrams per 100 grams, compared with just 2.4 milligrams in the sweet potato. Potatoes were historically valued at sea for exactly this reason. In our index the white potato carries the vitamin-c-rich goal tag, and the sweet potato does not.

Fiber, sugar, and calories

The remaining numbers are close enough that neither food runs away with anything:

• Calories: 86 per 100 grams for sweet potato, 77 for white potato. Nearly identical, and both are modest for how filling they are.
• Fiber: 3 grams for sweet potato, 2.1 grams for white potato per 100 grams. A small edge to the sweet potato, and in both cases much of the fiber lives in or near the skin, so peel-free preparations keep more of it.
• Sugar: 4.18 grams for sweet potato, 0.82 grams for white potato. The sweet potato earns its name, though both totals are low, and both foods carry our low-sugar tag.
• Sodium: 55 milligrams for sweet potato, just 6 for white potato. Both are naturally low-sodium foods before anything is added at the stove.

Protein, iron, and magnesium are all within rounding distance of each other. The white potato actually edges ahead on protein at 2.05 grams versus 1.57 grams per 100 grams.

So why does the white potato have a junk-food reputation?

Because of what we do to it. A plain potato scoring 83 in our index and a bag of chips are different foods. Potato chips, plain, salted score 53, with 532 calories and 34 grams of fat per 100 grams. The frying oil and the portion format did that, not the potato. The same trap catches the sweet potato: sweet potato chips, unsalted drop to a score of 72 with 532 calories per 100 grams, even though the vitamin A survives the fryer.

Judge the vegetable by the vegetable. Baked, boiled, roasted, or steamed, the white potato is a low-sodium, low-sugar, vitamin C and potassium contributor that most Americans already like eating. That is a valuable combination, and it is why the raw potato with skin sits comfortably in the top tier of our vegetable rankings.

The verdict

If you can only pick one, pick the sweet potato. The vitamin A payload is enormous, the fiber is slightly higher, and its overall score of 91 reflects that. But the honest answer is that you do not have to pick one. The white potato wins on potassium, vitamin C, protein, and sugar. Rotating both gets you the best of each profile for roughly the same calories.

Want to see the full nutrient-by-nutrient breakdown? Put sweet potato and white potato head to head in our compare tool and check every line for yourself.