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Paediatric Fluid Maintenance (Holliday-Segar) Calculator

4-2-1 rule — daily IV fluid requirement by weight.

Calculates daily and hourly IV fluid maintenance requirements for paediatric patients using the Holliday-Segar (4-2-1) method.

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Daily: 100 mL/kg for first 10 kg + 50×next 10 + 20×rest

In depth

Calculates daily and hourly IV fluid maintenance requirements for paediatric patients using the Holliday-Segar (4-2-1) method.