Clark's Rule — Paediatric Dose by Body Weight

Calculate paediatric drug dose using Clark's Rule (paediatric dose = weight(lb) / 150 × adult dose) as a historical weight-based dosing method for estimating approximate doses in children.

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.
Advertisement

How It Works

Calculate paediatric drug dose using Clark's Rule (paediatric dose = weight(lb) / 150 × adult dose) as a historical weight-based dosing method for estimating approximate doses in children

Each component has a specific meaning:

  • Clark's Rule / 150 × adult dose) as a historical weight-based dosing method — The clark's rule / 150 × adult dose) as a historical weight-based dosing method recorded for the scenario being assessed.

Note: Interpret the clark's rule paediatric result against the thresholds and context described above.

How to Use

Enter the Clark's Rule / 150 × adult dose) as a historical weight-based dosing method for the scenario you are assessing. Calculate paediatric drug dose using Clark's Rule (paediatric dose = weight(lb) / 150 × adult dose) as a historical weight-based dosing method for estimating approximate doses in children. Use the clark's rule paediatric result to inform your calculation.

Frequently Asked Questions