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Pediatric Dose Calculator (Young / Clark / mg·kg⁻¹ / BSA)

· Last updated：2026-08-04

This tool is for informational purposes only and does not constitute medical, financial, or legal advice; consult a qualified professional for advice.

Estimate a pediatric drug dose using one of four methods: (1) Young's rule (age-based) — Child dose = Adult dose × age / (age + 12); (2) Clark's rule (weight in pounds) — Child dose = Adult dose × weight(lb) / 150; (3) mg/kg per-weight regimen (the modern first-line method) — Child dose = dosePerKg × weight(kg); (4) BSA method (Mosteller) — Child dose = Adult dose × BSA_child / 1.73, with BSA = √(height·weight/3600). These are empirical approximations; modern practice prefers drug-specific mg/kg or mg/m² regimens derived from pediatric trials and verified against pediatric references and the approved labeling. Not medical advice.

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Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Health
Input types
select, number
Output type
json
Sample coverage
4
API ready
Yes

Overview

The Pediatric Dose Calculator estimates a child dose using Young's rule, Clark's rule, an mg/kg regimen, or the Mosteller BSA method. Results are empirical estimates and must be checked against drug-specific pediatric references, approved labeling, and a qualified healthcare professional.

When to use

  • Compare an age-based or weight-based estimate with a documented pediatric dosing reference.
  • Calculate a dose from a drug-specific mg/kg regimen and the child's weight.
  • Estimate a BSA-based dose when the child's height, weight, and adult dose are available.

How it works

  1. 1Choose Young's rule, Clark's rule, mg/kg, or BSA from the Calculation Method menu.
  2. 2Enter the inputs required for the selected method, such as adult dose, age, weight, height, or dose per kg.
  3. 3The calculator applies the selected formula and rounds the child dose to the chosen number of decimal places.
  4. 4The result is returned as JSON with the estimated dose, method, formula, and model description.

Use cases

  • Check the arithmetic for an age-based pediatric dose estimate using Young's rule.
  • Apply a documented mg/kg regimen to a child's measured weight.
  • Calculate a Mosteller body surface area estimate for comparison with a BSA-based dosing reference.

Examples

1. Young's rule age-based estimate

Healthcare student

Background

A learner wants to verify the arithmetic for an age-based estimate using an adult dose of 200 mg and a child age of 6 years.

Problem

Calculate the estimated child dose with Young's rule and retain four decimal places.

How to use

Select Young's rule, enter 200 for Adult dose and 6 for Child age, then set Decimal Places to 4.

{"method":"young","adultDose":200,"age":6,"decimalPlaces":4}

Outcome

The JSON result reports an estimated child dose of 66.6667 mg using dose = adultDose × age / (age + 12).

2. Weight-based mg/kg calculation

Clinical reference user

Background

A documented pediatric regimen specifies 5 mg/kg, and the child's recorded weight is 20 kg.

Problem

Calculate the dose from the per-kilogram regimen.

How to use

Select mg/kg, enter 5 for Dose per kg and 20 for Child weight, then choose the desired decimal precision.

FAQ

Which pediatric dose methods are supported?

The calculator supports Young's rule, Clark's rule, mg/kg dosing, and the Mosteller BSA method.

What inputs does the mg/kg method require?

It requires the dose per kg in mg/kg and the child's weight in kilograms.

Does Clark's rule use kilograms or pounds?

Clark's rule uses weight in pounds. The calculator accepts weight in kilograms and converts it automatically.

What inputs are required for the BSA method?

The BSA method requires an adult dose, child weight in kilograms, and child height in centimeters.

Is this calculator medical advice?

No. It provides empirical estimates only. Verify dosing with current pediatric references, approved labeling, and a qualified healthcare professional.

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{"method":"mgkg","dosePerKg":5,"weightKg":20,"decimalPlaces":4}

Outcome

The JSON result reports an estimated child dose of 100 mg using dose = dosePerKg × weight(kg).