Medical Calculators
Acid–base & electrolyte calculators for medical exams and the bedside
Anion Gap Calculator
Calculate the serum anion gap from Na, Cl and HCO₃ — with potassium option, albumin correction, and high vs normal gap interpretation.
Serum Osmolality Calculator
Compute calculated serum/plasma osmolality in conventional or SI units, with the osmolal gap against a measured value.
Delta Gap & Delta-Delta Ratio
Detect a mixed acid–base disorder hiding behind a high anion gap acidosis, from the anion gap and bicarbonate.
Winters' Formula Calculator
Expected PaCO₂ in a metabolic acidosis (1.5 × HCO₃ + 8 ± 2), with a check for concurrent respiratory disorders.
Acid–Base Compensation Calculator
Expected compensation for any primary disorder — metabolic or respiratory acidosis or alkalosis, acute or chronic.
These tools are for education and clinical decision support only, and do not replace professional medical judgement or your laboratory's own reference ranges.