Health & Fitness
Holiday-Segar Maintenance Fluids Calculator
Calculate pediatric maintenance IV fluid rate from body weight using the Holiday-Segar method.
Preparing your result…
What this calculator does
Calculates Holiday-Segar Maintenance Fluids Calculator using the formula verified against the cited source.
What your result means
An estimate from the inputs you enter, within the scope stated below — not advice.
Formula
100 mL/kg for first 10kg + 50 mL/kg for next 10kg + 20 mL/kg for remainder, per 24h
The step-by-step working for your own numbers appears with the result above and in the PDF report.
Frequently asked questions
Symbols and assumptions
- Inputs
- The values entered in the fields above
- • Holliday–Segar routine-maintenance estimate in mL/24 h: 100min(W,10)+50min(max(W−10,0),10)+20max(W−20,0), W in kg. Divide the daily volume by 24 for the corresponding exact hourly rate.
Sources and review
Reviewed 2026-10-18 · Next review 2027-04-18
- • Correct spelling is Holliday–Segar. This is routine maintenance for the guideline population, not resuscitation, dehydration-deficit or ongoing-loss replacement. Neonates and clinical conditions have separate protocols; 4–2–1 hourly rule is an approximation, not identical daily arithmetic.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Quick reference
| Scenario | Child's weight (kg) | Maintenance fluid rate |
|---|---|---|
| Worked example | 18 | 58.3333 mL/hour |
| Half the amounts | 9 | 37.5 mL/hour |
| Double the amounts | 36 | 75.8333 mL/hour |
Need the full picture? Get the detailed PDF report with charts, tables, formulas and working steps.
Reviewed 2026-10-18 · Next review 2027-04-18
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