Dose calculator
Pick a medicine and work out the dose by weight or age, using the catalogue dosage rules.
Choose the medicine
Only medicines that have dosage rules are listed.
⚠️ Free calculation, no medicine involved. Always check the working and the values. The calculator is an aid: always confirm the dose against your local clinical protocol. Rules marked “pending review” have not yet been validated by a pharmacist or doctor.
Safety and references
- The result is a calculation aid, not a prescription: check it against the leaflet, the local protocol or a pharmacist.
- Obese patients: a per-kg dose may call for ideal or adjusted weight, not actual weight.
- Renal or hepatic impairment may require adjusting the dose or the interval.
- Chemotherapy and other narrow-margin drugs only with a specialist.
- Check the units (mg or mcg, IU, ml) and that the weight is plausible before giving the drug.
References
- Bates DW, et al. Incidence of adverse drug events and potential adverse drug events. JAMA. 1995;274(1):29-34.
- Merry AF, Anderson BJ. Medication errors — new approaches to prevention. Paediatr Anaesth. 2011;21(7):743-753.