Daily Potassium Needs Calculator
Calculate daily potassium target in mg from age, sex, and health status.
Returns adequate intake, top food sources per serving, and cautions for kidney disease.
Potassium is an essential electrolyte that plays a critical role in muscle contraction, nerve signaling, fluid balance, and heart rhythm regulation. Inadequate potassium intake is linked to high blood pressure, kidney stones, and increased cardiovascular risk.
Recommended Daily Intake (AI: Adequate Intake):
| Age Group | Male | Female | Pregnant | Lactating |
|---|---|---|---|---|
| 1–3 years | 2,000 mg | 2,000 mg | — | — |
| 4–8 years | 2,300 mg | 2,300 mg | — | — |
| 9–13 years | 2,500 mg | 2,300 mg | — | — |
| 14–18 years | 3,000 mg | 2,300 mg | 2,600 mg | 2,500 mg |
| 19–50 years | 3,400 mg | 2,600 mg | 2,900 mg | 2,800 mg |
| 51+ years | 3,400 mg | 2,600 mg | — | — |
Activity Level Adjustments: Active individuals lose potassium through sweat. Athletes and those exercising heavily may need 10–20% more than baseline recommendations. Endurance athletes in hot climates should pay particular attention to potassium replacement.
Health Condition Adjustments: People with high blood pressure often benefit from higher potassium intake (up to 4,700 mg/day according to the DASH diet, short for Dietary Approaches to Stop Hypertension). However, individuals with kidney disease must often restrict potassium, as impaired kidneys cannot excrete excess amounts efficiently.
Top Potassium-Rich Foods:
- Banana: ~422 mg per medium banana
- Sweet potato: ~541 mg per medium potato
- Spinach (cooked): ~839 mg per cup
- Avocado: ~708 mg per whole avocado
- White beans: ~1,004 mg per cup (cooked)
Practical Tips: Most adults do not consume enough potassium. Aim to include potassium-rich fruits, vegetables, legumes, and dairy products in every meal. Cooking method matters more than people expect. Boiling leaches potassium into the water, and for kidney patients that is actually the point: double-boiling potatoes, discarding the water each time, can strip out roughly half the potassium. If you are trying to get more, bake or steam instead. If you take a diuretic or a blood pressure medication, ask your doctor before changing anything. Potassium-sparing diuretics such as spironolactone, and ACE (angiotensin-converting enzyme) inhibitors such as lisinopril, both push potassium up rather than down, and combining one of those with a deliberate high-potassium diet is how people end up hyperkalaemic.
One note on the numbers above. These are Adequate Intakes, not Recommended Dietary Allowances. The distinction matters: an AI is set from what healthy populations actually consume, because the evidence was not strong enough to establish an RDA. There is also no Tolerable Upper Intake Level for potassium from food, which is why this calculator shows no upper limit. That absence applies to food only. Supplements are a different matter, and over-the-counter potassium tablets are capped at 99 mg per pill in the United States for exactly this reason.
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