A medium baked russet potato with skin contains about 952 mg of potassium, making it one of the richest everyday sources of this mineral. That single potato delivers roughly 28% of the daily recommended intake for adult men and 37% for adult women. For comparison, a medium banana, the food most associated with potassium, has only about 451 mg.
Potassium by Potato Type
Not all potatoes pack the same potassium punch. White potatoes (russets and similar varieties) contain noticeably more potassium than sweet potatoes. Per 100 grams of raw potato, a white potato provides about 17% of the daily value for potassium, while a sweet potato provides about 10%. That gap holds whether you’re comparing them baked, roasted, or mashed.
As a baseline, 100 grams of raw white potato contains roughly 454 mg of potassium. A whole medium baked russet runs higher simply because it weighs more than 100 grams. If you’re choosing potatoes specifically for their potassium content, standard white varieties are your best bet.
How Cooking Changes Potassium Content
Baking or roasting a potato keeps nearly all of its potassium intact because the mineral has nowhere to go. Boiling is a different story. When potato pieces sit in water, potassium leaches out into the cooking liquid. The amount lost depends on how small you cut the potato and how long it stays in water.
Strip-cut potatoes (thin, fry-shaped pieces) boiled in water drop from 454 mg per 100 grams raw to about 287 mg after cooking, a loss of roughly 37%. Dice-cut potatoes lose a similar amount, landing around 295 mg per 100 grams. Double boiling, where you boil the potatoes, discard the water, and boil again, removes about 50% of the original potassium.
For most people, this leaching effect is just useful context: if you want to maximize potassium from your potatoes, bake or roast them. If you boil them, you’ll still get a good amount, just less than the full 952 mg you’d get from a whole baked potato.
How Potatoes Compare to Other High-Potassium Foods
Potatoes quietly outperform most foods people think of as potassium-rich. A medium baked potato with skin delivers more than twice the potassium of a medium banana. It also rivals or exceeds many other commonly cited sources like avocados, spinach, and beans on a per-serving basis.
The practical advantage of potatoes is that they’re inexpensive, widely available, and easy to eat in large portions. Most people don’t eat two bananas at a sitting, but finishing a whole baked potato is routine. That makes potatoes one of the most effective ways to close the gap on daily potassium needs.
How Much Potassium You Actually Need
The adequate intake for potassium, set by the National Academies of Sciences, is 3,400 mg per day for adult men and 2,600 mg per day for adult women. These values apply across all adult age groups from 19 onward. Most Americans fall well short of these targets, averaging closer to 2,500 mg daily.
A single medium baked potato covers a significant chunk of that goal. Pair it with other potassium-containing foods throughout the day, like beans, yogurt, or leafy greens, and hitting the target becomes realistic without supplements.
Why Potassium Matters
Potassium plays a direct role in blood pressure regulation. It helps your kidneys flush out excess sodium through urine. When potassium intake drops too low, your kidneys start retaining more sodium and water, which raises blood volume and pushes blood pressure up. Research in healthy adults has shown that even modest potassium restriction leads to measurable increases in blood pressure through this sodium-retention mechanism.
This relationship works in both directions. Getting enough potassium promotes sodium excretion and helps keep fluid balance in check, which is one reason diets rich in fruits, vegetables, and potatoes are consistently linked to healthier blood pressure levels.
Reducing Potassium for Kidney Concerns
People with kidney disease sometimes need to limit potassium because their kidneys can’t excrete it efficiently. Potatoes don’t have to be off the menu entirely, but preparation matters a lot in this case.
The most effective method is to boil potato pieces first, then soak them in fresh water. Strip-cut potatoes boiled for 8 minutes and soaked for 12 hours dropped to just 41 mg of potassium per 100 grams, a 91% reduction from raw. Even dice-cut potatoes treated the same way fell to 122 mg per 100 grams. Simply soaking raw potatoes before cooking, on the other hand, does not remove a meaningful amount of potassium and isn’t worth the effort.
Frozen fries are another option, since they’ve already been peeled, blanched, and processed. Soaking frozen fries for about 6 hours before cooking can bring their potassium content down to manageable levels.