Most cheese is relatively low in potassium. A typical serving of hard cheese like cheddar or Swiss contains well under 200 mg of potassium, which is the standard cutoff used by hospitals and dietitians to classify a food as “low potassium.” For context, adults need between 2,600 and 3,400 mg of potassium per day, so a slice or two of cheese barely moves the needle.
That said, not all cheeses are equal. Some varieties pack noticeably more potassium than others, and serving size matters more than most people realize.
Potassium in Common Cheese Varieties
Hard and semi-hard cheeses tend to be on the lower end. A cup of diced cheddar has about 100 mg of potassium. Swiss cheese is similar at roughly 95 mg per cup diced. Whole-milk mozzarella comes in around 85 mg per cup shredded. These are all comfortably in the low-potassium category, and since most people eat less than a full cup of diced cheese in one sitting, real-world servings are even lower.
A few varieties climb higher. Part-skim mozzarella contains about 248 mg per cup diced, and processed Swiss cheese reaches around 302 mg per cup. Parmesan comes in at roughly 180 mg per cup of grated cheese, though you’d rarely eat that much parmesan in one meal. Cottage cheese sits right near the borderline at 194 mg per typical serving, making it one of the higher-potassium options in the cheese family without quite crossing the 200 mg threshold in a standard portion.
The general pattern: softer, higher-moisture cheeses and processed cheeses tend to contain more potassium than aged, hard varieties. This is partly because water-soluble minerals like potassium concentrate differently depending on how much whey is retained during production.
How Cheese Compares to High-Potassium Foods
To put cheese in perspective, a medium banana has about 422 mg of potassium. A baked potato can exceed 900 mg. A cup of cooked spinach delivers over 800 mg. Even a glass of milk has roughly 350 mg. Cheese, by comparison, is one of the lowest-potassium dairy products you can choose.
This makes cheese a practical option if you’re trying to enjoy dairy without significantly increasing your potassium intake. Swapping a glass of milk for a serving of cheddar or Swiss on a sandwich, for instance, cuts your potassium from that meal by more than half.
Serving Size Changes the Math
The potassium numbers above are based on standardized portions, but real eating habits vary. A generous cheese plate, a loaded pizza, or a big bowl of mac and cheese can easily add up to two or three cups of cheese. At that point, even a low-potassium variety like cheddar starts contributing meaningful amounts.
A single 1-ounce slice of cheddar (roughly the size of a domino) contains only about 28 mg of potassium. That’s negligible. But if you’re grating a full cup of parmesan over pasta or eating a cup and a half of cottage cheese as a snack, you’re getting closer to 200 or 300 mg. The cheese itself isn’t high in potassium per ounce, but portions add up.
Cheese on a Potassium-Restricted Diet
People with chronic kidney disease are often the ones most concerned about potassium in specific foods. When the kidneys can’t efficiently remove potassium from the blood, levels can climb high enough to cause heart rhythm problems and muscle weakness. For this reason, people with kidney disease frequently work with a dietitian to manage potassium intake carefully.
Most hard cheeses fit comfortably within a potassium-restricted diet when eaten in normal portions. However, cheese does present a separate concern for people with kidney disease: phosphorus. Dairy products are naturally rich in protein and phosphorus, and damaged kidneys struggle to filter excess phosphorus just as they struggle with potassium. So while a few slices of cheddar won’t spike your potassium, your care team may still recommend limiting dairy for other reasons.
If you’re managing kidney disease, the key guidance from the National Institute of Diabetes and Digestive and Kidney Diseases is to watch serving sizes closely. A small portion of a lower-potassium food is fine, but a large portion of that same food can deliver more potassium than a small serving of something classified as “high potassium.” This principle applies directly to cheese: safe in moderate amounts, potentially problematic in large ones.
The Bottom Line on Cheese and Potassium
Cheese is one of the lower-potassium foods in the average diet. Most standard servings of hard cheese contain 30 to 100 mg of potassium, well below the 200 mg threshold that defines a high-potassium food. Cottage cheese, part-skim mozzarella, and processed varieties run higher but still fall far short of fruits, vegetables, and other dairy products like milk and yogurt. For most people, cheese is not a significant source of potassium in either direction: it won’t help you meet your daily goal, and it won’t push you over a limit.