Work out maintenance iv fluid rate instantly with clear inputs, formula shown and shareable results.
Applies the Holliday-Segar 4-2-1 rule: 4 mL/kg/h for the first 10 kg, 2 mL/kg/h for the next 10 kg and 1 mL/kg/h thereafter.
Holliday-Segar 4-2-1 rule
Rate = 4 x first 10 kg + 2 x next 10 kg + 1 x remaining kg, in mL/h
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
The rule scales to adults but many units cap maintenance fluids and prefer 25 to 30 mL/kg/day for adults.
Yes. Existing dehydration and ongoing losses are replaced in addition to maintenance.