Sodium to Potassium Ratio Calculator

Calculate the sodium-to-potassium (Na/K) ratio to assess electrolyte balance, based on sodium and potassium intake or concentrations.

Standard
Step by Step
Chart

Result

Detailed Steps

Visual Representation

Formula

Sodium to Potassium Ratio Calculation

The Na/K ratio is calculated by dividing the sodium amount by the potassium amount, using consistent units (e.g., mg or mmol):

Na/K Ratio = Sodium (mg or mmol) ÷ Potassium (mg or mmol)

Unit Conversion

To convert milligrams to millimoles:

Sodium (mmol) = Sodium (mg) ÷ 23
Potassium (mmol) = Potassium (mg) ÷ 39

Recommended Guideline

The ideal Na/K ratio for electrolyte balance is approximately 3:2 (or 1.5:1), reflecting the sodium-potassium pump’s activity in cells:

Na/K Ratio Interpretation
1.3–1.7 Optimal (close to 3:2 or 1.5:1)
> 1.7 High sodium relative to potassium
< 1.3 Low sodium relative to potassium

Consult a healthcare provider or dietitian to interpret results, especially for urinary measurements or dietary adjustments.

How to Use the Sodium to Potassium Ratio Calculator

  1. Enter your sodium intake or concentration (e.g., 2300 mg or 100 mmol).
  2. Enter your potassium intake or concentration (e.g., 3500 mg or 90 mmol).
  3. Select the unit (milligrams or millimoles) for each input.
  4. Choose the input type (Dietary Intake or Urinary Concentration).
  5. Choose your preferred display mode (Standard, Step by Step, or Chart).
  6. Click the “Calculate” button to view your Na/K ratio.
  7. Review the results to ensure your ratio is close to the ideal 3:2 (1.5:1).

Frequently Asked Questions (FAQs)

What is the sodium-to-potassium ratio?

The Na/K ratio measures the balance of sodium to potassium, either in dietary intake or urinary excretion, to assess electrolyte health.

Why is the Na/K ratio important?

It reflects the balance needed for the sodium-potassium pump, which supports muscle contraction, nerve function, and fluid balance. An ideal ratio is ~1.5:1.

What is the ideal Na/K ratio?

A ratio of 3:2 (1.5:1) is ideal, as it aligns with cellular pump activity. Ratios between 1.3 and 1.7 are generally considered optimal.

How do I measure sodium and potassium?

For dietary intake, use nutrition labels or apps to track sodium and potassium from foods. For urinary concentrations, consult a healthcare provider for 24-hour or spot urine tests.

How do I convert milligrams to millimoles?

Divide sodium (mg) by 23 and potassium (mg) by 39 to get millimoles. The calculator handles this conversion automatically.