# Pediatric Weight-Based Dose Calculator (mg/kg)
> Free pediatric weight-based dose calculator. Enter weight (kg), mg/kg, and optional max single dose — returns the calculated dose plus a max-dose cap warning.

## Overview

Weight-based pediatric dosing remains the foundation of paediatric pharmacotherapy. This calculator multiplies weight (kg) by the dose (mg/kg) and applies an optional maximum single-dose cap. The American Academy of Pediatrics and most institutional dosing references rely on this framework, with adjustments for age band, renal function, and obesity-adjusted dosing in select medications. Always cross-reference an institutional formulary, the FDA label, and a paediatric pharmacist before administering — the calculator does not validate that the chosen mg/kg or maximum dose is appropriate for the medication.

## Who this is for

- Paediatric residents and APPs
- Emergency physicians dosing for paediatric patients
- Hospital and community pharmacists

## How to interpret the result

| Score / band | Meaning |
|---|---|
| Calculated dose | Weight × mg/kg, rounded to a clinically usable dose. |
| Capped final dose | If the calculated dose exceeds the max, the final dose is the cap. |

## Cited source

**AAP Pediatric Dosing Conventions (institutional formulary)** (2023) — American Academy of Pediatrics

_Primary publication:_ Lexicomp Pediatric, Harriet Lane Handbook

## FAQs

### When is ideal body weight used in paediatrics?

Many lipid-soluble agents (e.g. anaesthesia induction, certain antibiotics) are dosed by ideal body weight in obese paediatric patients. Verify against the medication's specific guidance.

### What is the maximum single dose?

Most paediatric drug dosing caps approach the adult dose at adolescent weights. The cap is medication-specific; confirm from the formulary.

### Are neonatal doses different?

Yes. Neonates (< 28 days) and very-low-birth-weight infants typically have separate dose ranges due to immature renal/hepatic function. This calculator does not handle neonatal-specific bands.

### Should I round the calculated dose?

Yes — round to a practical, measurable dose using the available formulation. Many institutions have rounding conventions (e.g. round to nearest 5 mg or volumetric increment).

### Does this calculator validate the mg/kg I enter?

No. It performs the multiplication and applies the cap. The clinician is responsible for confirming the mg/kg and max from the FDA label and formulary.

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_Rounds AI is a citation-first clinical AI assistant. It supports clinical reasoning by surfacing cited information and is not a substitute for independent clinical judgement._