Potassium Intake Calculator

How Much Potassium Per Day Do You Need?

Potassium has two reference numbers. Adequate Intake (AI) is the amount that meets nutritional needs for most people, set by the National Academies. It is 2,600 mg/day for adult women and 3,400 mg/day for adult men. The FDA Daily Value (DV) is 4,700 mg, based on older research that suggested higher intakes reduce blood pressure and stroke risk. Most Americans consume 2,400–3,200 mg/day, which is adequate but below the DV.

The AI is a floor, not a ceiling. Higher intakes (up to the DV) may provide additional cardiovascular benefits, especially for people with high blood pressure. However, kidney disease requires restricting potassium — often to 2,000 mg/day or less — so always follow your clinician's guidance if you have kidney problems.

Source: NIH Office of Dietary Supplements, Potassium Fact Sheet for Health Professionals (2024). There is no established Tolerable Upper Intake Level (UL) for potassium from food, but supplements above 100 mg per dose should be used cautiously.

Why Is Potassium Important?

Potassium is an essential mineral and electrolyte that regulates fluid balance, nerve signals, and muscle contractions. It works with sodium to maintain blood pressure — higher potassium intake can lower blood pressure by helping your kidneys excrete excess sodium. Low potassium (hypokalemia) causes muscle weakness, cramps, fatigue, and irregular heartbeat.

Most potassium is intracellular (inside cells), with only 2% in blood. Blood tests measure serum potassium, which stays tightly regulated at 3.5–5.0 mEq/L. Dietary intake affects long-term health more than it affects serum levels day-to-day.

Potassium and Blood Pressure

Higher potassium intake is associated with lower blood pressure and reduced stroke risk. The DASH (Dietary Approaches to Stop Hypertension) diet, which is rich in fruits, vegetables, and low-fat dairy, provides about 4,700 mg potassium per day — the FDA Daily Value. Studies show that increasing potassium from 2,300 mg to 4,700 mg can lower systolic blood pressure by 3–5 mmHg in people with hypertension.

For blood pressure management, aim for the FDA DV (4,700 mg) if your kidneys are healthy. Focus on whole foods (see list below) rather than supplements, which can cause stomach upset and are less effective than food sources.

What Foods Are High in Potassium?

Potassium is abundant in fruits, vegetables, dairy, legumes, fish, and meat. A single medium baked potato with skin has 926 mg, and a cup of cooked spinach has 840 mg. Most processed foods are low in potassium and high in sodium, so a whole-food diet naturally delivers more potassium.

Source: USDA FoodData Central and NIH ODS. % DV is based on the FDA Daily Value of 4,700 mg potassium.

Can You Get Too Much Potassium?

For healthy people, too much potassium from food alone is rare because your kidneys excrete the excess. However, hyperkalemia (high blood potassium) is dangerous — it can cause irregular heartbeat and cardiac arrest. Hyperkalemia is most common in people with kidney disease, because damaged kidneys cannot excrete potassium efficiently.

Potassium supplements above 100 mg per dose can cause gastrointestinal distress (nausea, diarrhea, stomach pain). High-dose supplements can also be dangerous if you have kidney disease or take certain medications (ACE inhibitors, ARBs, potassium-sparing diuretics). Always consult your clinician before taking potassium supplements.

Upper limit: There is no established Tolerable Upper Intake Level (UL) for potassium from food, because healthy kidneys can handle very high intakes. Supplements are a different story — do not take more than 100 mg potassium per supplement dose without medical supervision.

How Much Potassium If You Have Kidney Disease?

Kidney disease usually requires restricting potassium to 2,000–3,000 mg/day, depending on stage and lab values. Damaged kidneys cannot excrete potassium efficiently, so it builds up in the blood (hyperkalemia). Your nephrologist or renal dietitian will give you a specific target based on your serum potassium level and kidney function.

If you have kidney disease, avoid high-potassium foods (bananas, oranges, potatoes, tomatoes, spinach, beans, dairy, salt substitutes containing potassium chloride). Focus on lower-potassium options like apples, berries, grapes, white bread, white rice, and green beans. Boiling vegetables in water can leach out some potassium.

Warning: This calculator provides general education only. Kidney disease requires individualized potassium targets from your clinician. Do not use this tool to set your own potassium intake if you have chronic kidney disease or are on dialysis.

Potassium and Medications

Certain medications affect potassium balance:

• Diuretics (loop and thiazide): Increase potassium loss in urine, which can lead to hypokalemia. You may need to eat more potassium-rich foods or take a supplement.
• Potassium-sparing diuretics (spironolactone, amiloride): Reduce potassium loss, which can lead to hyperkalemia if you eat too much potassium.
• ACE inhibitors and ARBs (blood pressure meds): Reduce potassium excretion, increasing hyperkalemia risk. Avoid high-dose potassium supplements.
• NSAIDs (ibuprofen, naproxen): Can raise potassium by reducing kidney function.

If you take any of these medications, ask your clinician whether you need to adjust your potassium intake. Do not start or stop potassium supplements without medical advice.

What About Salt Substitutes?

Salt substitutes (like Nu-Salt, NoSalt) replace sodium chloride with potassium chloride, delivering 530–650 mg of potassium per ¼ teaspoon. This is helpful for people trying to lower sodium and increase potassium simultaneously, but it is dangerous if you have kidney disease or take medications that raise potassium.

A typical daily use of salt substitute (½ to 1 teaspoon) adds 1,000–2,500 mg of potassium. If you have kidney disease, avoid salt substitutes unless your clinician approves. Healthy people can use them safely to reach the FDA Daily Value of 4,700 mg.

Potassium Deficiency: Signs and Symptoms

Low potassium (hypokalemia, serum K < 3.5 mEq/L) causes:

• Muscle weakness and cramps — especially in the legs
• Fatigue and lethargy
• Constipation and bloating
• Irregular heartbeat (arrhythmia) — can be serious
• Numbness or tingling

Causes of hypokalemia include prolonged diarrhea or vomiting, heavy sweating, chronic diuretic use, low dietary intake, and eating disorders. Severe hypokalemia requires medical treatment with potassium supplements or IV potassium. Mild deficiency can be corrected by eating more potassium-rich foods.

Should You Take a Potassium Supplement?

For most people, no. Food provides potassium in a form that is absorbed gradually and safely. Supplements deliver potassium all at once, which can cause stomach pain, nausea, and (in extreme cases) dangerous spikes in blood potassium.

FDA limits over-the-counter potassium supplements to 99 mg per dose, which is only 2% of the Daily Value. Higher-dose supplements (prescribed for hypokalemia) come in 10–20 mEq formulations (about 390–780 mg) and must be taken with food to prevent gastrointestinal damage.

The best strategy is to eat potassium-rich foods daily: potatoes, bananas, spinach, beans, tomatoes, fish, yogurt, and avocado. A whole-food diet provides 3,000–5,000 mg/day without supplements.

How Does Potassium Compare to Sodium?

Potassium and sodium work together to regulate fluid balance and blood pressure, but Americans consume too much sodium and too little potassium. The ideal sodium-to-potassium ratio is about 1:2 (more potassium than sodium). Most Americans consume 3,400 mg sodium and 2,600 mg potassium — almost a 1:1 ratio.

High sodium intake raises blood pressure by pulling water into blood vessels. High potassium intake lowers blood pressure by helping the kidneys excrete sodium. Correcting this imbalance — lower sodium, higher potassium — is one of the most effective dietary changes for cardiovascular health.

Use our sodium intake calculator to find your sodium target, then compare it to your potassium intake. Aim for about twice as much potassium as sodium.

How to Track Your Potassium Intake

Nutrition labels in the US are required to list potassium since 2021 (FDA Final Rule). The % Daily Value on labels is based on 4,700 mg. To estimate your daily intake:

1. Log your food for 3–7 days in a tracking app (MyFitnessPal, Cronometer) or use USDA FoodData Central.
2. Add up the potassium from all meals, snacks, and drinks.
3. Compare your average to the AI (2,600–3,400 mg) or DV (4,700 mg).
4. If you are low, add one or two high-potassium foods per day (baked potato, spinach, beans, banana).

A typical day that meets the FDA DV includes: a banana (422 mg), baked potato (926 mg), cup of cooked spinach (840 mg), cup of yogurt (573 mg), orange juice (496 mg), 3 oz salmon (534 mg), and smaller amounts from other foods. This totals about 4,800 mg.

What If You Exercise Heavily or Sweat a Lot?

Sweat contains potassium, but the loss is small compared to sodium. A typical hour of moderate exercise loses about 100–150 mg potassium in sweat, vs 1,000–2,000 mg sodium. You do not need to "replace" potassium after most workouts — your normal diet is sufficient.

Prolonged endurance events (marathons, Ironman) may deplete potassium, especially if you are not eating during the event. Bananas, oranges, coconut water, and sports drinks with potassium (some formulas have 100–200 mg per serving) can help. However, sodium replacement is far more critical than potassium in these scenarios.