3 Pediatrics Calculators – Weight, Medication Arithmetic & Dehydration
Pediatrics calculators cover age-based weight estimation, selected weight-based medication arithmetic, and the Clinical Dehydration Scale for young children with acute gastroenteritis.
Use measured weight when available. Pediatric formulas and thresholds have age, population, and protocol boundaries and must not be replaced with adult equations.
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Choose a calculator by task
Use the task groups below to find the calculator whose formula, intended population, required measurements, and purpose match the task.
Weight estimation and medication arithmetic
Use age-based weight estimation only when a current measured weight is unavailable, and use medication arithmetic only for the selected regimens explicitly listed on its page.
Dehydration assessment
Use the four-item Clinical Dehydration Scale only within its stated pediatric acute-gastroenteritis context.
How to choose a calculator in this category
- Prefer a current measured body weight over an age-based estimate whenever it is available and reliable.
- Use Pediatric Dosing only for the selected, explicitly listed medication regimens; it is not a general pediatric prescribing tool.
- Use the Clinical Dehydration Scale only in its defined age and acute-gastroenteritis assessment context.
Important limits
- Adult thresholds and formulas cannot be applied automatically to children.
- Age-estimated weight can differ materially from measured weight and does not replace weighing the child.
- These pages do not choose a medicine, dose, fluid, treatment, route, monitoring plan, or disposition.