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Pediatric Maintenance Fluid (4-2-1) Calculator

Holliday-Segar 4-2-1 hourly maintenance rate.

Compute the hourly maintenance IV fluid rate for a child using 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 for each kg over 20 kg.

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

kg

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

Rate = 4·min(wt,10) + 2·max(0, min(wt−10, 10)) + 1·max(0, wt−20) mL/h.

In depth

Compute the hourly maintenance IV fluid rate for a child using 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 for each kg over 20 kg.