Calories in Sweet Potato vs Regular Potato 2026
A medium sweet potato has 103 calories. A medium regular potato has 165 calories. That’s a 37% difference, yet most people assume sweet potatoes are the heavier hitter nutritionally—a mistake that costs them real calories if they’re trying to lose weight.
Last verified: April 2026
Executive Summary
| Metric | Sweet Potato (Medium, 100g) | Regular Potato (Medium, 100g) | Difference |
|---|---|---|---|
| Calories | 86 | 77 | +11% sweet potato |
| Protein (g) | 1.6 | 2.1 | Regular potato wins |
| Carbs (g) | 20.1 | 17.3 | +16% sweet potato |
| Fiber (g) | 3.0 | 2.1 | +43% sweet potato |
| Sugar (g) | 4.2 | 0.8 | +425% sweet potato |
| Vitamin A (IU) | 10,191 | 2 | Sweet potato dominates |
| Glycemic Index | 63-70 | 58-72 | Comparable |
The Calorie Reality Check
Here’s what trips people up: they’ve heard “sweet potato is healthier” so many times that they assume it must be lower in calories. It isn’t. Per 100 grams, sweet potatoes actually contain 11% more calories than regular potatoes. But wait—this gets more nuanced depending on how you prepare them and what you’re comparing.
When we look at a raw medium sweet potato (about 103 grams), it clocks in at 86 calories. A raw medium regular potato (about 150 grams) weighs more and delivers 116 calories. So if you’re eating a whole medium vegetable as your portion, the regular potato actually comes out slightly ahead in calories. The confusion exists because the online databases often compare standard 100-gram servings, which don’t reflect real-world portions.
What matters more than raw calories is how your body processes them. Sweet potatoes pack significantly more fiber—43% more per gram—which slows digestion and keeps you fuller longer. That fiber difference is the real story here. A regular potato with skin has 2.1 grams of fiber per 100g. A sweet potato has 3.0 grams. That’s not massive, but it’s measurable.
The sugar content, though? That’s where regular potatoes pull ahead. Sweet potatoes contain 4.2 grams of natural sugars per 100 grams compared to 0.8 grams in regular potatoes. If you’re monitoring sugar intake for any reason—blood sugar management, diabetes, or just general nutrition strategy—this matters. You’re essentially eating a vegetable with roughly 5 times more sugar.
Nutrient Density Comparison
| Nutrient | Sweet Potato | Regular Potato | Winner |
|---|---|---|---|
| Vitamin A (per 100g) | 961 μg RAE | 0 μg RAE | Sweet potato (not even close) |
| Vitamin C (per 100g) | 8.8 mg | 4.6 mg | Sweet potato |
| Potassium (per 100g) | 337 mg | 429 mg | Regular potato |
| Manganese (per 100g) | 0.259 mg | 0.121 mg | Sweet potato |
| Vitamin B6 (per 100g) | 0.286 mg | 0.298 mg | Essentially tied |
The vitamin A difference is genuinely staggering. One medium sweet potato delivers 961 micrograms of retinol activity equivalent (RAE)—that’s 107% of your daily recommendation if you’re a woman, 85% if you’re a man. A regular potato has essentially zero vitamin A. That single nutrient advantage is why sweet potatoes earned their “superfood” reputation, and it’s legit.
But regular potatoes aren’t nutritional dead weight. They contain 429 milligrams of potassium per 100 grams versus 337 in sweet potatoes—a 27% advantage. If you’re worried about blood pressure or just maintaining good electrolyte balance, regular potatoes deliver more of what matters. They also have slightly more protein, though we’re talking 2.1 grams versus 1.6 grams, which is marginal either way since potatoes aren’t a protein source you should rely on.
Key Factors That Change Everything
1. Preparation Method Adds 200+ Calories
Raw nutrition data is only half the story. Bake a medium sweet potato without oil and you’re at 103 calories. Add 2 tablespoons of butter and you’re at 279 calories. That’s a 171% increase from a single topping. French fries—whether made from sweet potatoes or regular—require deep frying in oil, which adds roughly 150-200 calories per serving regardless of which potato you started with. The cooking method matters more than the potato choice when you’re tracking calories.
2. Skin Presence Changes Fiber by 40%
Most of the fiber in potatoes lives in the skin. Peel your potato and you drop from 2.1 grams to roughly 1.3 grams of fiber per 100 grams. That matters because fiber is what separates “I’m full” from “I’m hungry again in two hours.” Both sweet potatoes and regular potatoes lose meaningful amounts of nutrition when peeled, so if you’re eating mashed potatoes made from peeled russets, you’re not getting the full fiber benefit of either vegetable. Baked with the skin on? That’s different.
3. Variety Changes Carb Load by 12%
Not all regular potatoes are created equal. A russet potato has 17 grams of carbs per 100g. A fingerling potato has roughly 15 grams. A red potato sits at 16 grams. Sweet potatoes? Consistently 20 grams. These differences seem small until you realize that someone with insulin sensitivity or Type 2 diabetes might feel the difference between a 15-gram and 20-gram carb increment at a meal. Sweet potatoes aren’t dramatically different, but they do trend higher.
4. Glycemic Index Overlap Means Category Matters Less Than You Think
Sweet potatoes have a glycemic index of 63-70. Regular potatoes range from 58-72 depending on how they’re cooked. Boiled potatoes sit around 62. Microwaved potatoes jump to 82. The way you cook your potato matters more than the potato type when it comes to blood sugar impact. A boiled sweet potato and a boiled regular potato will affect your glucose levels in nearly identical ways.
Expert Tips for Practical Use
Tip 1: Choose Regular Potatoes for High-Potassium Needs
If you’re managing blood pressure or have been told to increase potassium intake, regular potatoes are your better choice. One medium regular potato (150g) provides 644 milligrams of potassium. A medium sweet potato (103g) provides 347 milligrams. That’s an 85% difference. Cook them boiled or baked without butter and you get the mineral benefit without added fat.
Tip 2: Eat Sweet Potatoes for Vitamin A Without Supplements
One medium sweet potato covers your entire daily vitamin A need. If you’re eating processed foods low in vegetables, a single sweet potato solves that problem. Regular potatoes won’t. This is the legitimate edge sweet potatoes have. Take advantage of it if you’re not getting vitamin A from other sources like spinach, kale, or carrots.
Tip 3: Compare Full Portions, Not 100g Servings
When portion planning, weigh your actual vegetable. A medium regular potato is typically 150 grams and delivers 116 calories. A medium sweet potato is typically 103 grams and delivers 86 calories. At real-world portion sizes, they’re closer in calories than the per-100g numbers suggest. This matters for meal prep accuracy.
Tip 4: Keep Skin On for Both, Always
The difference between peeled and unpeeled potatoes (either variety) is a 40% fiber loss. That fiber is what prevents the blood sugar spike and keeps you satisfied. Baked potatoes or boiled with skins beat mashed potatoes by this metric every time. If you hate potato skin texture, roast thin-skinned varieties like fingerlings whole.
FAQ
Are sweet potatoes actually lower in calories than regular potatoes?
No—this is the most common misconception. Per 100 grams, sweet potatoes have 11% more calories than regular potatoes (86 vs. 77). At real-world portion sizes—a medium whole vegetable—regular potatoes actually deliver slightly more calories because they weigh more. The “sweet potato is lower calorie” claim is false and likely stems from confusion about nutritional superiority, which sweet potatoes do have in some areas like vitamin A. But calories themselves? Regular potatoes are the lower-calorie choice if you’re comparing medium-sized vegetables as you’d actually eat them.
Which potato is better for blood sugar control?
This is messier than I’d like it to be. Both potatoes have comparable glycemic indices that overlap significantly depending on preparation. A boiled sweet potato (index around 63) and a boiled regular potato (index around 62) affect blood glucose nearly identically. The cooking method matters far more than the potato type. If you have diabetes or prediabetes, focus on cooking method (boiling beats frying), portion size (one potato, not two), and pairing with protein and fat rather than potato choice. The difference between them is real but small.
If I’m trying to lose weight, which should I eat?
Regular potatoes in real-world portion sizes contain fewer calories per serving, making them technically the better choice if calories are your primary metric. A medium regular potato has roughly 116 calories; a medium sweet potato has 86. However, sweet potatoes deliver more fiber and will keep you fuller longer, which may prevent overeating later. The actual winner depends on your personal hunger patterns. Try both and see which one keeps you satisfied longer. That matters more than a 30-calorie difference.
Why do people think sweet potatoes are healthier if they have more calories?
Sweet potatoes earn the “superfood” label almost entirely because of their massive vitamin A content—one medium potato delivers your entire day’s requirement. They also have more fiber and manganese than regular potatoes. These advantages are real and substantial for overall nutrition. But “healthier” depends on your goals. If you need potassium, regular potatoes win. If you need calories minimized, regular potatoes edge ahead. If you need vitamin A and fiber, sweet potatoes demolish regular potatoes. “Healthier” is too vague a term to mean anything useful. Healthier for what?
Bottom Line
Regular potatoes have fewer calories and more potassium per serving. Sweet potatoes have far superior vitamin A, more fiber, and more natural sugar. If you’re calorie-counting, regular potatoes are your play. If you’re optimizing overall micronutrient density, sweet potatoes deliver better value. Don’t choose based on the myth that one is universally healthier than the other—choose based on what specific nutritional goal you’re actually trying to hit this week.
