BSA Calculator

Calculate Body Surface Area (BSA) using Mosteller, DuBois, and Haycock formulas for chemotherapy and medical dosing.

BSA Calculator Options
Result Details
Enter parameters and click Calculate to view.
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Clinical Tool

BSA Calculator

Estimate total Body Surface Area (BSA) for clinical dosing.

100% Free & Local
STEP 01

Input Weight

Enter the patient's body weight in kilograms or pounds.

STEP 02

Input Height

Specify the patient's height in centimeters or feet/inches.

STEP 03

Equation Matching

The engine processes parameters across Mosteller, DuBois, and Haycock scientific models.

STEP 04

Check Surface Area

Click Calculate to output the surface area result in square meters (m²) for drug dosage scaling.

Your Privacy Matters

All calculations run locally in your browser.

No Server Uploads

No variables or results are sent to our servers.

Auto-Cleared

Your session data is erased upon closing the tab.

Capabilities

Key Capabilities

Complete Features

Mosteller Simplification

Computes the standard, simplified mathematical square-root model preferred by clinicians.

Multi-Equation Support

Includes the classic DuBois and Haycock formulas to cross-reference biological parameters.

Oncology Dosing Aid

Helps calculate exact narrow-therapeutic-index chemotherapy infusions.

Unit Auto-Conversions

Accepts input options in standard metric variables.

Private Clinical Math

Your patient's physical dimensions and dosages are processed entirely in browser memory.

Help

Common Questions Answered

Support
Q1 What is Body Surface Area (BSA)?
Body Surface Area is the calculated outer surface area of a human body, measured in square meters (m²), widely used as a standard for drug dosing rather than total body weight.
Q2 Why is BSA preferred over weight for drug dosing?
BSA correlates closely with cardiac output and metabolic rate, ensuring more stable blood concentrations for high-toxicity drugs like chemotherapy.
Q3 What is a normal average adult BSA?
The average adult male has a BSA of approximately 1.9 m², while the average adult female has a BSA of about 1.6 m².
Q4 Which equation is the most popular in clinical practice?
The Mosteller formula is the most common because it is simple: take the square root of (height in cm multiplied by weight in kg divided by 3,600).
Q5 Can this BSA tool be used for children?
Yes. The Haycock and Boyd equations are particularly well-validated for infants and pediatric patients where body ratios differ from adults.