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Anion Gap Calculator

Health
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Calculates the anion gap, a diagnostic tool used to assess acid-base balance and identify the cause of metabolic acidosis.

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How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Sodium (Na+) in mEq/L, Chloride (Cl-) in mEq/L, and Bicarbonate (HCO3-) in mEq/L in the units shown.

Step 2

Read Anion Gap in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Normal Values

Sodium (Na+) in mEq/L: 140 mEq/L; Chloride (Cl-) in mEq/L: 100 mEq/L; Bicarbonate (HCO3-) in mEq/L: 24 mEq/L

Anion Gap: 16 mEq/L

Increased Anion Gap (Lactic Acidosis)

Sodium (Na+) in mEq/L: 140 mEq/L; Chloride (Cl-) in mEq/L: 98 mEq/L; Bicarbonate (HCO3-) in mEq/L: 10 mEq/L

Anion Gap: 32 mEq/L

Normal Anion Gap (Hyperchloremic Acidosis)

Sodium (Na+) in mEq/L: 140 mEq/L; Chloride (Cl-) in mEq/L: 110 mEq/L; Bicarbonate (HCO3-) in mEq/L: 24 mEq/L

Anion Gap: 6 mEq/L

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Important

Use the result as an estimate and confirm any medical decisions with a qualified professional.