Body weight (kilograms) = BW

If patient is obese, use lean or ideal body weight*

Hemoglobin concentration (g/dl) = Hgb

Concentration of elemental iron in the parenteral product (mg/mL) = C¶

Blood volume is 65 mL per kilogram

Hemoglobin concentration to be corrected to 14 g/dl

Each gram of hemoglobin contains 3.3 mg of iron

Addition of iron for repletion of body stores is optional

Blood volume (dL) = 65 (mL/kg) x body weight (kg) ÷ 100 (mL/dL)

Hemoglobin deficit (g/dl) = 14 - patient hemoglobin concentration

Hemoglobin deficit (g) = hemoglobin deficit (g/dl) x blood volume (dL)

Iron deficit (mg) = hemoglobin deficit (g) x 3.3 (mg Fe/g Hgb)

Volume of parenteral iron product required (mL) = iron deficit (mg) ÷ C (mg/mL)

Hemoglobin iron deficit (mg) = BW x (14 - Hgb) x (2.145) + iron to replenish stores if desired (mg)

Volume of product required (mL) = BW x (14 - Hgb) x (2.145) ÷ C (if no added iron for stores)