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Drug Calculator

The fastest way to get safe infusion, fluid and emergency numbers for the patient in front of you, and the natural first step into Bramwell.

Anaesthesia maths is repetitive, time-critical and unforgiving of arithmetic slips. Bramwell's calculator does it per patient: enter the weight once and it flows through every infusion, fluid and emergency dose, worked from the concentrations your clinic actually stocks.

What it does

  • Per-patient dosing by weight, so one number drives the whole sheet.
  • Constant-rate infusions worked to mL/hr for the syringe driver, at your stocked dilutions.
  • Fluid rates, deficits and boluses for dogs and cats.
  • An emergency sheet you can reach for when seconds matter.
Fentanyl infusion (neat, 50 µg/mL): syringe-driver rates at 20 kg. Illustrative example.Fentanyl infusion (neat) · 50 µg/mLPATIENT WEIGHT20 kgCRI RATE · µg/kg/hrSYRINGE DRIVER · mL/hr10.420.831.241.652.0
Illustrative example. Verify all doses before use.
Fentanyl infusion (diluted to 10 µg/mL): syringe-driver rates at 20 kg. Illustrative example.Fentanyl infusion (diluted) · 10 µg/mLPATIENT WEIGHT20 kgDilute 2 mL fentanyl 50 µg/mL into 8 mL 0.9% NaCl → 10 µg/mLCRI RATE · µg/kg/hrSYRINGE DRIVER · mL/hr12243648510
Illustrative example. Verify all doses before use.
Emergency sheet at 20 kg (illustrative example)Emergency sheet · doses from patient weightPATIENT WEIGHT20 kgDRUGCONCDOSEVOLUMEARRESTAdrenaline (low)1 mg/mL0.01 mg/kg0.2 mLAdrenaline (high)1 mg/mL0.1 mg/kg2 mLANTAGONISTNaloxone0.4 mg/mL0.04 mg/kg2 mLDEFIBRILLATIONBiphasic external–2–4 J/kg40–80 JBiphasic internal–0.2–0.4 J/kg4–8 J
Illustrative example. Verify all doses before use.

Why teams like it

It removes a routine source of error and hesitation. The whole team can start using it without any rollout, and it's often how a hospital first meets Bramwell before bringing planning and analytics on board.