Sodium-Potassium Balance & Salt Calculator (Na:K)
Analyzes electrolyte balance between sodium and potassium, converting milligrams of sodium into dietary salt and identifying hypertension risk.
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Calculation
Result
- Na:K Molar Ratio
- 2.63
- Cardiovascular Risk Category
- High Risk (Na:K > 2.00 — fluid retention and hypertension)
- Equivalent Table Salt (NaCl)
- 8.6 g/day
- Recommended Sodium Limit
- 2000 mg/day
- Target Potassium Minimum
- 3510 mg/day
Ideal cardioprotective ratio < 1.00 (potassium should exceed sodium)
WHO upper ceiling: no more than 5.0 g salt per day (1 level teaspoon)
Maximum 2000 mg/day (1500 mg for hypertensive individuals per AHA)
Minimum 3510 mg/day (up to 4700 mg on DASH protocols)
Balancing your ratio does not mean eating bland food: focus on adding potassium-dense staples (baked potatoes with skins, leafy greens, avocados, legumes).
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How it is calculated
Applies WHO and AHA DASH diet guidelines. The Na:K molar ratio should ideally remain below 1.00 (optimal 0.50–0.70). High ratios drive fluid retention and arterial stiffness.
Formula
Na_mmol = Na_mg / 23; K_mmol = K_mg / 39.1; Na:K Ratio = Na_mmol / K_mmol; Salt NaCl (g) = Na_mg × 2.54 / 1000.
Limits of the method
Inapplicable to end-stage renal disease (CKD stage 4–5) where impaired potassium excretion requires dietary potassium restriction.
Sources of the method
- World Health Organization. Guideline: Sodium intake for adults and children. Geneva, 2012
- World Health Organization. Guideline: Potassium intake for adults and children. Geneva, 2012
- O’Donnell M. et al. Urinary sodium and potassium excretion and risk of cardiovascular events. JAMA, 2011;306(20):2229–2238
This calculation is for reference only and is not medical advice, a diagnosis or a prescription. If you have a medical condition, are pregnant, take medication or have any doubts, discuss the result with a physician or a qualified nutrition professional.
How to Restore Sodium-Potassium Equilibrium
Eliminate hidden industrial sodium
Up to 75% of dietary sodium comes not from the salt shaker, but from processed deli meats, hard cheeses, chips, canned items, and bakery goods.
Boost potassium from whole plants
Potassium triggers renal sodium excretion (natriuresis). Prioritize jacket potatoes, spinach, dried apricots, white beans, and bananas.
Switch to mineralized potassium salt
Reduced-sodium salt blends (where 30% of NaCl is replaced with KCl) lower systolic blood pressure by 3–5 mm Hg without losing flavor.
Dietary Pattern Comparisons
Ideal cardioprotective balance
Molar Na:K ratio = 0.73. Table salt equivalent: 4.6 g. Blood pressure consistently optimal.
Typical metropolitan diet
Molar Na:K ratio = 4.53 (severely elevated!). Salt = 12.2 g (2.5× above WHO safety threshold).
High sweat volume compensation
Na:K ratio = 1.45. With heavy perspiration, supplemental sodium compensates for sweat losses.
The cellular sodium-potassium pump (Na+/K+-ATPase)
Every cell membrane houses sodium-potassium pumps consuming up to 30% of basal metabolic energy. They extrude 3 sodium ions while importing 2 potassium ions. Excess sodium combined with low potassium triggers vascular smooth muscle spasm and sustained peripheral arterial resistance.
The PURE study findings (The Lancet, 2014)
The PURE study (102,000 participants across 17 countries) confirmed a U-shaped risk curve: both excessive sodium (> 5 g/day) and extreme sodium restriction (< 2–3 g/day, activating the RAAS cascade) elevate mortality. The true protective lever is not zero salt, but abundant dietary potassium (> 3.5 g/day).
Top Potassium-Rich Whole Foods (mg per 100 g)
| Food Item | Potassium per 100 g | Sodium per 100 g |
|---|---|---|
| Dried apricots (kuraga) | 1160 mg | 10 mg (ratio 116 : 1) |
| White & kidney beans (cooked) | 560 mg | 2 mg (ratio 280 : 1) |
| Potato baked with skin | 535 mg | 8 mg |
| Ripe avocado | 485 mg | 7 mg |
Boiling vegetables in excess water leaches up to 50% of potassium into the cooking water. Roasting, baking, or steaming preserves minerals.
Frequently asked questions
How do you convert milligrams of sodium into grams of table salt?
Pure NaCl consists of 39.3% sodium and 60.7% chloride. To calculate salt weight, multiply sodium milligrams by 2.54 and divide by 1000. For instance, 2000 mg Na = 5.08 g table salt.
Is pink Himalayan or sea salt healthier than regular table salt?
Himalayan and sea salts are 97–99% pure sodium chloride (NaCl). Trace minerals account for less than 1–2%, meaning they exert the identical osmotic and hemodynamic pressure on blood vessels.
Why does eating salty food in the evening cause facial puffiness?
Every gram of retained sodium attracts and holds approximately 100–120 mL of water in interstitial spaces. High-salt snacks at night can retain 1.0–1.5 L of water by morning.
Who must avoid increasing potassium intake?
Patients with advanced chronic kidney disease (eGFR < 30 mL/min), or those on potassium-sparing diuretics (spironolactone) or high-dose ACE inhibitors, due to fatal hyperkalemia risks.
How much sodium is strictly necessary for human survival?
The physiological absolute minimum required to preserve plasma volume and neural signaling is approximately 500 mg sodium daily (~1.25 g salt).
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What next
Formula breakdowns, biomarker reference ranges and nutrition articles with cited sources are in the NutriFit knowledge base.
Go to the knowledge base