Work out paediatric dose (clark rule) instantly with clear inputs, formula shown and shareable results.
Applies Clark's rule, which scales an adult dose by the child's weight in pounds divided by a 150 pound adult reference.
Clark's rule
Child dose = adult dose x weight (lb) / 150
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
Rarely in practice. Modern paediatric dosing uses mg/kg or mg/m2 values from a formulary; Clark's rule remains a teaching tool.
It represents a nominal 68 kg adult, the reference body size behind the adult dose.