Work out child dose by age instantly with clear inputs, formula shown and shareable results.
Applies the historical age-based dosing rules, Fried's for infants and Dilling's for older children, both of which scale the adult dose by age.
Age-based rules
Fried's rule: child dose = adult dose x age in months / 150. Dilling's rule: child dose = adult dose x age in years / 20
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
No. Modern practice uses mg/kg or mg/m2 values from a paediatric formulary; these rules are historical teaching aids.
Drug clearance depends on organ maturity and body size, neither of which tracks age closely enough.