A medium-sized potato (about 150g) contains roughly 110 to 130 calories, making it one of the lower-calorie starchy foods available. That number shifts significantly depending on how you cook it, whether you eat the skin, and what you put on top.
Calories by Cooking Method
The potato itself is not what drives calories up. It’s what happens during preparation. Per 100 grams of cooked potato, here’s how the numbers break down:
- Boiled with skin: 66 calories
- Boiled and peeled: 77 calories
- Baked with skin: 85 calories
- French fries (deep-fried): 280 calories
Boiling is the lowest-calorie method because potatoes absorb water, which adds weight without adding energy. Baking concentrates the potato slightly as moisture evaporates, bumping the calorie density up a bit. Deep frying, on the other hand, replaces water with oil, which is why french fries pack two to three times the calories of a boiled or baked potato per the same weight. A large serving of fries from a restaurant can easily exceed 500 calories before you add ketchup or dipping sauce.
White Potato vs. Sweet Potato
Sweet potatoes are often marketed as the healthier choice, but the calorie difference is small. Per 100 grams, a white potato has about 95 calories and a sweet potato has about 86. That’s less than a 10% difference. Sweet potatoes do contain more vitamin A (the compound that gives them their orange color), while white potatoes tend to be higher in potassium. Nutritionally, both are solid choices, and picking one over the other based on calories alone doesn’t make much practical difference.
How Size Affects the Count
Potatoes vary wildly in size, which makes calorie estimates tricky if you’re not weighing them. A small potato (about the size of a computer mouse, roughly 130g) runs around 90 to 100 calories. A medium potato, the kind you’d typically see served as a baked potato, weighs around 150 to 170g and comes in at 110 to 130 calories. A large russet, the type restaurants use for loaded baked potatoes, can weigh 300g or more and contain 250+ calories before any toppings.
If you’re tracking calories, weighing your potato is more reliable than eyeballing size categories. A kitchen scale removes the guesswork entirely.
Toppings Are Where Calories Add Up
A plain baked potato is a relatively modest meal at around 130 calories. But the classic loaded version tells a different story. A tablespoon of butter adds about 100 calories. Two tablespoons of sour cream add another 60. A generous handful of shredded cheese adds 110 or more. Bacon bits, another 30 to 50. A fully loaded baked potato can land anywhere from 400 to 600 calories depending on how heavy-handed you are.
If you want to keep a baked potato on the lighter side, Greek yogurt works as a sour cream substitute at roughly half the calories, and salsa or chopped chives add flavor with almost no caloric cost.
Skin On or Off
Potato skin is thin but nutritionally useful. It contains most of the potato’s fiber, roughly 2 grams per medium potato when you eat the skin versus closer to 1 gram without it. The calorie difference between eating skin-on and peeled is negligible. The real benefit of keeping the skin is that extra fiber, which slows digestion and helps you feel full longer.
Why Potatoes Keep You Full
Potatoes score higher on satiety research than almost any other food tested. In a well-known study that ranked foods by how full they kept people over two hours, boiled potatoes scored 323% relative to white bread (set at 100%). That’s higher than brown rice, pasta, oatmeal, and even many protein-rich foods. The combination of water content, fiber, and volume means a potato fills your stomach effectively for its calorie cost.
This is one reason potatoes sometimes get an unfair reputation in diet culture. They’re a starchy carbohydrate, which leads people to lump them in with refined grains. But a plain boiled potato is closer in calorie density to many vegetables than it is to bread or pasta.
Cooled Potatoes Are Slightly Lower in Calories
When you cook a potato and then refrigerate it, some of the starch changes structure and becomes what’s called resistant starch. Your body can’t fully break it down, so you absorb fewer calories from it. Regular starch delivers about 4 calories per gram, while resistant starch delivers roughly 2.5 calories per gram. This process, called starch retrogradation, also works with rice and pasta.
The calorie reduction isn’t dramatic enough to transform a potato into a diet food on its own, but it’s a real effect. Even if you reheat the potato after refrigerating it, some of that resistant starch remains. So potato salad, reheated leftover potatoes, or cold potato dishes are marginally lower in usable calories than a freshly cooked potato.