3 calculators

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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Which tool fits this task?

Compare the purpose, inputs, and returned measure before opening a calculator. These distinctions describe tool scope; they do not make a diagnosis or choose treatment.

Weight and selected dosing arithmetic

These two tools answer related but distinct questions: estimating a weight when needed versus applying one explicitly listed medication regimen.

Pediatric Age-Based Weight Estimate

Use when: Estimate weight by the supported age-based pediatric methods when a measured weight is unavailable.
Inputs: Completed age and the applicable historical method.
Returns: One or two age-based weight estimates.
Distinction: A measured weight is preferred; the estimate is not an automatic dose selection.

Pediatric Dosing Calculator

Use when: Perform arithmetic for one of the explicitly listed pediatric medication regimens.
Inputs: Measured kg when available, age boundary, regimen, and selected dose inputs.
Returns: The supported single-dose or schedule arithmetic with caps and limits.
Distinction: It is not a general prescribing engine or treatment recommendation.

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.

Peds WeightPediatric Age-Based Weight EstimateCompare historical revised-APLS and Luscombe–Owens age-only weight estimates from completed age, with source-priority, accuracy and clinical-use limitations.Peds DosingPediatric Dosing CalculatorCalculate source-specific pediatric reference-dose arithmetic for selected amoxicillin, ibuprofen and intravenous acetaminophen regimens using current measured weight and explicit dose limits.

Dehydration assessment

Use the four-item Clinical Dehydration Scale only within its stated pediatric acute-gastroenteritis context.

Pediatric CDSClinical Dehydration Scale (CDS) for ChildrenCalculate the four-item Clinical Dehydration Scale for children 1–60 completed months with acute gastroenteritis, with formal categories, validation scope and red-flag limitations.

Use pediatric tools within their age and protocol boundaries

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.

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Related calculator categories

General Medicine Calculators Emergency Medicine & Critical Care Calculators Pulmonology Calculators Nephrology Calculators