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Dose by Body Surface Area Calculator (BSA = √(H·W/3600))

· 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.

Calculate an individualized drug dose from body surface area using the Mosteller formula: BSA (m²) = √(Height(cm) · Weight(kg) / 3600), then Dose = Drug_dose_per_m² × BSA. BSA is the recommended normalization for many cytotoxic and pediatric regimens because drug clearance scales more linearly with BSA than with body weight across patients of different sizes. Also reports the standard adult dose at the reference adult BSA of 1.73 m² for comparison. Valid only for linear drug clearance — BSA dosing does not apply to saturable (Michaelis-Menten) pathways. 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
number
Output type
json
Sample coverage
4
API ready
Yes

Overview

Calculate body surface area (BSA) with the Mosteller formula and estimate a drug dose from a prescribed dose per square meter. Enter height, weight, and dose per m² to receive BSA, individualized dose, and the standard adult comparison at 1.73 m². This calculator is for linear drug clearance models and is not medical advice.

When to use

  • Estimate a dose from height, weight, and a prescribed value in mg/m².
  • Calculate BSA for reviewing pediatric or cytotoxic dosing regimens that use body surface area.
  • Compare an individualized dose with the standard adult dose based on a reference BSA of 1.73 m².

How it works

  1. 1Enter height in centimeters, weight in kilograms, and the drug dose per square meter in mg/m².
  2. 2The calculator applies the Mosteller formula: BSA = √(height × weight / 3600).
  3. 3It calculates the dose as dose per m² × BSA.
  4. 4The result also shows the standard adult dose calculated with a reference BSA of 1.73 m²; decimal places can be set from 0 to 8.

Use cases

  • Reviewing dose-per-m² calculations for pediatric regimens.
  • Estimating BSA-based doses for cytotoxic treatment protocols.
  • Checking the difference between a patient-specific dose and the reference adult dose.

Examples

1. Adult BSA dose calculation

Clinical researcher

Background

An adult has a height of 170 cm, a weight of 70 kg, and a prescribed drug dose of 200 mg/m².

Problem

Calculate the patient-specific BSA dose and compare it with the reference adult dose.

How to use

Enter height 170, weight 70, dose per m² 200, and select 4 decimal places.

height: 170; weight: 70; dosePerM2: 200; decimalPlaces: 4

Outcome

BSA = 1.8181 m² and dose = 363.6237 mg. The standard adult comparison is 346 mg.

2. Child BSA dose calculation

Pediatric dosing reviewer

Background

A child has a height of 50 cm, a weight of 18 kg, and a prescribed drug dose of 200 mg/m².

Problem

Determine the BSA-based dose for the child and compare it with the reference adult dose.

How to use

Enter height 50, weight 18, dose per m² 200, and select 4 decimal places.

height: 50; weight: 18; dosePerM2: 200; decimalPlaces: 4

FAQ

What formula does this calculator use?

It uses the Mosteller formula: BSA (m²) = √(height in cm × weight in kg / 3600).

What inputs are required?

You must enter positive height, weight, and drug dose per m² values. Height is in cm, weight is in kg, and dose is in mg/m².

How is the individualized dose calculated?

The dose equals the entered drug dose per m² multiplied by the calculated BSA.

What is the standard adult dose shown in the result?

It is the dose calculated using the reference adult BSA of 1.73 m².

Can this calculator be used for every drug?

No. It is described for linear drug clearance models and does not apply to saturable, Michaelis-Menten pathways. It is not medical advice.

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Outcome

BSA = 0.5 m² and dose = 100 mg. The standard adult comparison is 346 mg.