Iron Infusion Dose Calculator
Ferric carboxymaltose (Ferinject and generics) for adults and adolescents 14 and over. Ganzoni deficit, the product information table and a dose plan.
For registered health professionals only. Not for patients or the public. It applies the published formula and product information table, and shows its working so you can check every step. Check the current product information and your local protocol before prescribing. Adult and adolescent (14+) dosing only. This doesn’t replace clinical judgement. Nothing you enter leaves this device.
Simplified table (body weight ≥35 kg)
- Hb under 100 g/L35 to under 70 kg: 1500 mg · 70 kg and over: 2000 mg
- Hb 100 to under 140 g/L35 to under 70 kg: 1000 mg · 70 kg and over: 1500 mg
- Hb 140 g/L or more500 mg (either weight). Recheck iron studies before any repeat dose.
Limits per administration
- Single dose: no more than 20 mg/kg, and no more than 1000 mg (20 mL).
- No more than 1000 mg per week. Give any further dose at least 7 days later.
- Under 35 kg: use Ganzoni only, with target Hb 130 g/L and stores 15 mg/kg (filled in automatically).
- Ganzoni formula: total iron deficit (mg) = body weight (kg) × (target Hb − actual Hb, g/L) × 0.24 + iron stores (mg).
- Ganzoni rounding (PI): round down to the nearest 100 mg if 66 kg or less, round up if over 66 kg.
Safety
- Low phosphate. Common after ferric carboxymaltose, usually silent and short-lived. Repeat doses and risk factors (malnutrition, malabsorption, low vitamin D, hyperparathyroidism) can lead to osteomalacia and fractures. Check phosphate before repeat courses; ask about bone pain or tiredness.
- Skin staining. Extravasation can cause long-lasting brown staining. Stop the infusion at once if leakage occurs, and warn the patient beforehand.
- Hypersensitivity: give where resuscitation is available and observe for at least 30 minutes.
Alternative: ferric derisomaltose
Ferric derisomaltose (Monofer) is another high-dose IV iron. Trials show lower rates of low phosphate than ferric carboxymaltose, so it can suit patients at risk. Its doses and limits differ: use its own product information, not this calculator.
Sources
- Ferinject data sheet (CSL Vifor), revised 18 July 2024. Simplified table, Ganzoni method, dose limits, phosphate and extravasation warnings.
- Ferric Carboxymaltose Teva, Australian PI (approved 22 Sept 2025). Same table and limits.
- Ferrive (ferric carboxymaltose), Australian PI (Nov 2025). Same table and limits.
- Australian Prescriber: Skin staining from iron infusions