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Ganzoni Iron Deficit Calculator

Total iron deficit for IV iron repletion.

Compute total iron deficit (mg) using the Ganzoni equation: deficit = weight · (Hb_target − Hb_current) · 2.4 + iron-store reserve (typically 500 mg in adults).

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

kg
g/dL
g/dL

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Deficit (mg) = weight (kg) · (Hb_target − Hb_current g/dL) · 2.4 + iron_store

In depth

Compute total iron deficit (mg) using the Ganzoni equation: deficit = weight · (Hb_target − Hb_current) · 2.4 + iron-store reserve (typically 500 mg in adults).