Pediatric IV Fluid Calculator
Maintenance (Holliday-Segar / 4-2-1), crystalloid bolus, and deficit replacement for children. Clinical reference for OPD, ward, and emergency use.
How FluidCalc works
Maintenance — Holliday-Segar (daily)
- First 10 kg: 100 mL/kg/day
- Next 10 kg (11–20 kg): 50 mL/kg/day
- Each kg above 20: 20 mL/kg/day
Hourly rate — 4-2-1 rule
- First 10 kg: 4 mL/kg/h
- Next 10 kg: 2 mL/kg/h
- Each kg above 20: 1 mL/kg/h
Bolus
Default options 10 or 20 mL/kg crystalloid. Reassess perfusion after each bolus; follow sepsis/shock pathways for repeats and blood products.
Deficit
Approximate volume deficit ≈ % dehydration × weight (kg) × 10 mL. Replace per protocol (often over 24 h with maintenance), adjusting for ongoing losses.
Common questions
What is the Holliday-Segar pediatric maintenance fluid rule?
100 mL/kg/day for the first 10 kg, 50 mL/kg/day for the next 10 kg, and 20 mL/kg/day for each kg above 20. The hourly 4-2-1 rule is the same math.
How do I calculate a pediatric fluid bolus?
A common crystalloid bolus is 10–20 mL/kg of isotonic fluid, given rapidly and then reassessed. Use local shock/sepsis protocols for volume and repeats.
Who built FluidCalc on PediaRx?
Dr. Shounak Pal, MBBS — practising physician; sole developer and clinical author of PediaRx.
Does FluidCalc collect patient data?
No. Weight and dehydration percent stay on your device. Calculations run locally.
Clinical disclaimer: Reference tool for qualified professionals only. Neonatal fluids, DKA, SIADH, burns, and ICU regimes need specialist protocols. Verify every plan before starting IV fluids.