Calculators · Critical care

Infusion rate calculator

Enter the drug you have, how you diluted it and the dose you want. You get the pump rate in mL/hr, with the working shown so you can cross-check.

1Drug and ampoule

Drug name (optional, for your label)

Strength per ampoule / vial

Check the label: is the strength stated as salt or as base? (e.g. noradrenaline bitartrate 2 mg = 1 mg base)

Volume per ampoule (mL)

Ampoules used

2Dilution

Diluent volume (mL)

Add ampoule volume to diluent to get the final volume (untick if you made the mixture up to a fixed total, e.g. "made up to 50 mL")

3Patient and dose

Weight (kg)

Target dose

Fill in the fields above to see the result.

This is a calculation aid for qualified doctors and nurses, not a substitute for clinical judgement. Always check the ampoule label (salt vs base), your hospital protocol and the drug's dose limits, and confirm the rate independently before starting an infusion. All calculations run on your phone; nothing you enter is sent or stored.