How Much Potassium Is in Cashews?

Raw cashew kernels contain roughly 620 mg of potassium per 100 grams, making potassium the single most abundant mineral in the nut. In a standard one-ounce serving (about 28 grams), that works out to around 170–180 mg of potassium. That is a meaningful contribution to your daily intake, though it falls short of what potassium-rich fruits and vegetables deliver per serving. The full picture depends on how the cashews are processed, whether they are salted, and what else you are eating alongside them.

The Numbers Behind Raw Cashews

An analysis of raw cashew kernels sourced from multiple growing regions found that potassium averaged 622 mg per 100 grams, with some natural variation depending on where the nuts were grown (the range spanned roughly 560–680 mg per 100 g across samples).¹ Potassium was followed in abundance by phosphorus (about 503 mg/100 g), magnesium (about 249 mg/100 g), and calcium (about 41 mg/100 g).¹ So potassium dominates the mineral profile of a cashew by a wide margin.

Most people do not eat 100 grams of cashews in a sitting, though. A typical snack-sized handful is about one ounce, or 28 grams, which delivers approximately 170–180 mg of potassium. For reference, the adequate daily intake of potassium for most adults sits between 2,600 and 3,400 mg, depending on age and sex. One serving of cashews covers roughly 5–7 percent of that target. Not a powerhouse on its own, but not negligible either, especially when cashews are part of a broader snack mix or used as a cooking ingredient where you might use two or three ounces at a time.

How Cashews Stack Up Against Other Nuts

Among tree nuts, cashews and pistachios stand out as particularly high in potassium.² Almonds and peanuts (technically a legume, but grouped with nuts nutritionally) are in a similar neighborhood, generally ranging from about 650 to 700 mg per 100 g. Pistachios tend to edge ahead of cashews, landing somewhere around 1,000 mg per 100 g in many analyses, which makes them the tree nut champion for potassium. Walnuts, on the other hand, sit lower, usually around 440 mg per 100 g.

So cashews occupy a solidly above-average position in the nut world. They are not the very highest potassium source among nuts, but they are well above the bottom tier. For someone who does not enjoy pistachios or who finds almonds hard to chew, cashews are a perfectly good alternative for getting potassium from a nut-based snack. The creamy texture of cashews also makes them versatile in cooking: blended into sauces, stirred into curries, or ground into butter, they carry their mineral content into dishes where other nuts would be harder to incorporate.

What Processing Does to Potassium Content

Most cashews you find in stores are not raw. They have been roasted, boiled, fried, or at least steam-treated to remove the toxic shell oil (urushiol, the same irritant found in poison ivy) that surrounds the edible kernel. This processing matters for mineral content. Research on the elemental composition of cashew nuts found that processing techniques reduce some essential mineral elements.³

The mechanism is straightforward. Potassium is water-soluble. Any processing step that involves soaking, boiling, or steaming can leach potassium out of the nut and into the surrounding water. Dry roasting tends to preserve minerals better than wet methods, because no water is present to carry them away. Oil roasting falls somewhere in between; the oil medium does not dissolve potassium the way water does, but the high temperatures can still alter the nut’s cellular structure in ways that affect mineral retention.

The practical takeaway: if maximizing potassium is your goal, dry-roasted or minimally processed cashews will deliver more than those that have been boiled or soaked extensively. The 622 mg per 100 g figure comes from raw kernels, so roasted store-bought cashews may contain somewhat less. The USDA’s nutrient database lists dry-roasted cashews at around 565 mg of potassium per 100 g, which aligns with the idea that processing shaves off a modest but real fraction of the mineral content.

The Salted Cashew Question

Salted cashews are one of the most popular snack formats, and salt changes the nutritional equation in a way that goes beyond just adding sodium. Research comparing salted and unsalted versions of the same foods has found that sodium levels in salted products are dramatically higher (as expected), while potassium levels can also shift, though less dramatically. The sodium-to-potassium ratio is always less favorable in the salted versions.⁴

This matters because what your body does with dietary potassium partly depends on how much sodium you are consuming at the same time. Both minerals compete for the same transport and excretion pathways in the kidneys. When sodium intake is high, your body excretes more potassium to maintain electrolyte balance. So salted cashews deliver a double hit: you get a nut that is already slightly lower in potassium than the raw version (because of processing), and then the added sodium pushes your body to waste more of the potassium you did absorb.

If you are reaching for cashews specifically for their mineral benefits, unsalted or lightly salted varieties are the better choice. The potassium content of the nut itself is roughly the same either way, but the overall effect on your body’s potassium balance is more favorable without the added sodium.

Potassium, Blood Pressure, and the Bigger Dietary Picture

One of the main reasons people care about dietary potassium is blood pressure. Potassium helps relax blood vessel walls and promotes sodium excretion through the kidneys, both of which work to bring blood pressure down. A diet rich in potassium from whole foods, like the DASH (Dietary Approaches to Stop Hypertension) pattern, has been consistently associated with better blood pressure outcomes. Higher adherence to the DASH diet correlates strongly with higher potassium intake.⁵

Cashews specifically have shown some promise here. A meta-analysis looking at randomized controlled trials of cashew nut consumption found a significant reduction in systolic blood pressure (the top number) among people who ate cashews compared to control groups, with a mean drop of about 3.4 mmHg.⁶ The same meta-analysis found no significant effect on diastolic blood pressure or on blood lipid levels (cholesterol, triglycerides), so the blood pressure benefit appears specific to systolic pressure.

A 3.4 mmHg drop in systolic blood pressure sounds modest, and it is, but population-wide reductions of that size are associated with meaningful decreases in heart attack and stroke risk over time. The finding does not mean cashews alone will fix high blood pressure. It means they can be one component of a dietary pattern that supports healthier blood pressure, alongside the usual suspects: fruits, vegetables, whole grains, and lower sodium intake.

It is also worth noting that potassium is only one of the mechanisms at play. Cashews contain magnesium, unsaturated fats, and plant sterols, all of which have their own cardiovascular effects. Trying to isolate which specific nutrient is driving the blood pressure reduction is tricky, and in practice it does not matter much. You eat the whole nut, not a purified extract.

The Magnesium Connection

Cashews are often discussed in the context of magnesium, and for good reason. At roughly 250 mg of magnesium per 100 g, they are one of the richer food sources of this mineral.¹ Magnesium and potassium work together in several important ways. Magnesium is required for the proper function of the cellular pumps that keep potassium inside cells where it belongs. When magnesium levels are low, potassium leaks out of cells more easily and gets excreted in the urine, making it harder to maintain normal potassium levels even if your dietary intake is adequate.

This synergy means that a food which delivers both minerals simultaneously, as cashews do, may have a more favorable effect on your electrolyte status than one that delivers potassium alone. It is a point that gets lost in conversations that focus on single nutrients in isolation. The mineral profile of cashews, with potassium as the dominant mineral and substantial magnesium and phosphorus backing it up, is part of what makes them a useful dietary addition beyond what any one mineral number would suggest.

Who Should Be Careful with Cashew Potassium

For most people, the potassium in cashews is entirely beneficial and poses no risk. But there are two groups who need to pay closer attention.

People with chronic kidney disease are often told to limit potassium intake because their kidneys cannot excrete it efficiently. In advanced stages of kidney disease, potassium builds up in the blood and can cause dangerous heart rhythm disturbances. For these individuals, the 170–180 mg of potassium in a one-ounce serving of cashews is not catastrophic, but it adds up, especially if cashews are combined with other potassium-rich foods throughout the day. Your nephrologist or renal dietitian can help set specific limits based on your lab values.

The second concern with heavy cashew consumption is not potassium itself but oxalate. Cashews contain a moderate amount of oxalate, a compound that can bind with calcium in the kidneys and form kidney stones. A case report documented a patient who developed oxalate nephropathy (kidney damage from oxalate crystal deposits) after consuming large amounts of cashews daily.⁷ In that case, the patient’s total daily oxalate intake was far above average, and a low calcium diet worsened the problem because calcium was not available in the gut to bind the oxalate before it was absorbed. The high fat content of cashews (about 45 percent) further reduced calcium’s ability to bind oxalate in the digestive tract.⁷

This does not mean normal cashew consumption is dangerous for your kidneys. The case involved genuinely excessive daily quantities combined with a dietary pattern that amplified the risk. But if you have a history of calcium oxalate kidney stones, it is worth being mindful of portion sizes. Making sure your calcium intake is adequate actually helps, because calcium binds oxalate in the gut before it can be absorbed and reach the kidneys.

Getting More Potassium from Cashews in Practice

If you want to make the most of the potassium in cashews, a few practical strategies help:

Choose dry-roasted unsalted: You preserve more of the original potassium and avoid the sodium that undermines potassium’s benefits.
Use cashew butter: Nut butters are made from ground whole nuts, so the potassium content per weight is essentially the same as whole cashews. Two tablespoons of cashew butter gives you a similar mineral dose to a handful of whole cashews, and it is easy to add to smoothies or spread on toast.
Cook with cashew cream: Blending soaked cashews with water creates a cream that works in soups, pasta sauces, and curries. You lose a little potassium in the soaking water, but most stays in the blended product since you are using the nuts themselves, not discarding them.
Pair with high-potassium produce: Cashews in a stir-fry with spinach and sweet potato, or in a trail mix with dried apricots, stack potassium from multiple sources in one meal.

Keep in mind that cashews are calorie-dense, around 550–580 calories per 100 grams. Eating a full 100-gram bag to hit that 620 mg potassium mark means consuming a quarter of most people’s daily calorie needs. This is not a food you want to use as your primary potassium source. It works best as one piece of a varied diet that also includes bananas, potatoes, beans, leafy greens, and dairy, all of which deliver more potassium per calorie than cashews do.

The Cashew Testa and Other Edible Parts

The cashew testa, the thin papery skin surrounding the kernel, is usually removed during processing, but it is edible and contains its own mineral profile. An analysis of dried cashew nut testa found it contained about 1.5 grams of potassium per kilogram, which translates to 150 mg per 100 g.⁸ That is substantially lower than the kernel itself. The testa is richer in protein, fiber, calcium, and magnesium relative to some reference grains, but for potassium specifically, the kernel is where the action is.⁸

The cashew apple, the fleshy fruit attached to the shell, is consumed in tropical countries where cashews grow but rarely exported because it is extremely perishable. Its nutrient profile is quite different from the kernel, with far more vitamin C and less fat. The potassium content of the apple varies by cultivar and ripeness, and it is not a meaningful source compared to the nut itself for most consumers outside cashew-growing regions. If you have ever traveled in Brazil, India, or West Africa, you may have encountered cashew apple juice, which is popular locally but essentially unavailable in North American or European grocery stores.

Why Origin and Growing Conditions Matter

The variability in cashew potassium content across growing regions is worth a brief note. The 622 mg per 100 g average from the multi-origin study had a standard deviation of about 59 mg, meaning individual samples ranged across a window of roughly 60 mg above and below that average.¹ Soil mineral content, rainfall, altitude, and fertilization practices all influence how much potassium a cashew tree pulls up from the ground and deposits into its kernels.

You cannot tell from looking at a bag of cashews at the store which end of that range your nuts fall on. Nor does it matter much for practical purposes. A difference of 60 mg per 100 g translates to about 17 mg per one-ounce serving, which is nutritionally trivial. The point is just that “how much potassium is in cashews” does not have a single fixed answer down to the milligram. It is a range, and the commonly cited figures (whether from USDA databases or individual studies) represent averages across that natural variation.