4-2-1 Rule Intravenous Fluid (Hourly)

Compute hourly IV fluid rate using the 4-2-1 rule for pediatric maintenance: 4 mL/kg/hr for first 10 kg, plus 2 mL/kg/hr for next 10 kg, plus 1 mL/kg/hr for remaining weight.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Compute hourly IV fluid rate using the 4-2-1 rule for pediatric maintenance: 4 mL/kg/hr for first 10 kg, plus 2 mL/kg/hr for next 10 kg, plus 1 mL/kg/hr for remaining weight

Each component has a specific meaning:

  • 4-2-1 rule — The 4-2-1 rule recorded for the scenario being assessed.

Note: Interpret the 4-2-1 iv fluid rule result against the thresholds and context described above.

How to Use

Enter the 4-2-1 rule for the scenario you are assessing. Compute hourly IV fluid rate using the 4-2-1 rule for pediatric maintenance: 4 mL/kg/hr for first 10 kg, plus 2 mL/kg/hr for next 10 kg, plus 1 mL/kg/hr for remaining weight. Use the 4-2-1 iv fluid rule result to inform your calculation.

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Frequently Asked Questions