Nephrology · Internal Medicine

Total Body Potassium Deficit (Hypokalemia) calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Measured serum potassium

mmol/L

Allowed range: 1.5–5 mmol/L

Target serum potassium

mmol/L

Allowed range: 3–5 mmol/L

Target serum potassium for repletion planning; 4.0 mmol/L is a common adult target.

Result

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Clinical inputs

Measured serum potassium (mmol/L)Accepted range: 1.5 to 5
Target serum potassium (mmol/L)Accepted range: 3 to 5

Primary source

Gennari FJ. Hypokalemia. N Engl J Med. DOI: 10.1056/NEJM199808133390707. PMID: 9700180. Scope: total-body potassium deficit (mmol) = 100 × (target − measured serum K) / 0.3, reflecting ~100 mmol deficit per 0.3 mmol/L serum K fall. (1998)

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