Anion Gap Calculator

Calculate the serum anion gap and delta-delta ratio for metabolic acidosis workup and acid-base disorder classification.

Medical Disclaimer

This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.

Inputs

Sodium (Na⁺)

mEq/L

Chloride (Cl⁻)

mEq/L

Bicarbonate (HCO₃⁻)

mEq/L

Albumin

g/dL

Tab to move between fields

Results

Anion Gap

12mEq/L

Corrected AG (Albumin)

12mEq/L

Delta-Delta Ratio0

Classification1(1=Normal, 2=High AG, 3=Low AG)

How to Use This Calculator

Enter serum sodium (Na⁺), chloride (Cl⁻), and bicarbonate (HCO₃⁻) in mEq/L.
Set albumin level (g/dL) for albumin-corrected anion gap calculation.
Review Anion Gap and corrected anion gap — normal is 8–12 mEq/L (or 3–11 with albumin correction).
Elevated AG > 12 triggers MUDPILES differential (methanol, uremia, DKA, etc.).

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