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Clinical calculator summary

Body Surface Area Calculator

An estimate of body surface area from height and weight using Mosteller or Du Bois equations.

Evidence-based context for fast calculator use

Purpose:
Support verification of medicines prescribed in mg/m²
Population:
Patients whose protocol uses body-surface-area-based dosing and has current measured height and weight
Factors:
Height, Weight, Selected equation, Protocol dose intensity
Reference:
Du Bois and Du Bois, Arch Intern Med. 1916; Mosteller, N Engl J Med. 1987
HomeBody Surface Area (BSA)
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Body Surface Area (BSA)

kg
cm

Clinical Context & Background

Body Surface Area (BSA) is the measured or calculated surface area of a human body. In oncology, it is the standard metric for calculating dosages of chemotherapeutic agents (mg/m²). This calculator supports the traditional Du Bois & Du Bois formula as well as the widely used Mosteller formula.
Primary Source EvidenceDu Bois D, Du Bois EF. A formula to estimate the approximate surface area if height and weight be known. Arch Intern Med. 1916;17(6):863-871. (Also: Mosteller RD. N Engl J Med. 1987).
Formula Logic
Du Bois: 0.007184 × W^0.425 × H^0.725 | Mosteller: √((W × H) / 3600)

Reference Data

MethodEquation
Du Bois0.007184 × weight^0.425 × height^0.725
Mosteller√((weight × height) / 3600)

Clinical Workflow

Use, Interpret, And Continue The Patient Pathway

Expand for workflow guidance, limitations, examples, and related next steps.

When To Use

  • Use when a treatment protocol specifies dosing per square metre and current height and weight are available.
  • Use only when the patient and clinical setting match the population described for Body Surface Area Calculator.

How To Interpret

  • Mosteller and Du Bois estimates are usually similar but can diverge at body-size extremes.
  • Interpret thresholds with the entered units, current clinical status, and local guideline context.

What To Do Next

  • Multiply the verified BSA by the protocol dose and apply regimen-specific caps, rounding, organ adjustment, and independent checking.
  • Document the inputs, result, clinical judgment, and any reason for deviating from the model-guided pathway.

Limitations

  • BSA does not capture organ function, frailty, pharmacogenomics, toxicity history, or protocol-specific dose modifications.
  • This calculator supports clinical assessment and does not independently prescribe treatment.

Validated Population

Patients whose protocol uses body-surface-area-based dosing and has current measured height and weight

Clinical example

A patient 170 cm tall and 70 kg has a Mosteller BSA of about 1.82 m²; the final medicine dose still requires protocol and organ-function checks.

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Frequently Asked Questions

What is Body Surface Area Calculator used for?

Support verification of medicines prescribed in mg/m². It is intended for patients whose protocol uses body-surface-area-based dosing and has current measured height and weight.

Does Body Surface Area Calculator determine treatment by itself?

No. Confirm the population, inputs, contraindications, competing risks, and current guideline recommendations before acting on the result.

Evidence-based oncology decision support. Verify with clinical guidelines.