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Body Surface Area Dosing Calculator

Work out body surface area dosing instantly with clear inputs, formula shown and shareable results.

About Body Surface Area Dosing Calculator

Calculates body surface area with the Mosteller and Du Bois formulae and multiplies the Mosteller value by the prescribed dose per square metre.

Formula

BSA formulae

Mosteller: BSA = sqrt(height cm x weight kg / 3600). Du Bois: BSA = 0.007184 x height^0.725 x weight^0.425

Worked example

With the default values below, Body Surface Area Dosing Calculator returns Dose from Mosteller BSA of 181.8. Change any input above and every figure here is recalculated in your browser.

Inputs used

Heightaccepts 40–220 cm
170 cm
Weightaccepts 2–250 kg
70 kg
Dose per square metreaccepts 0.1–3,000 mg/m2
100 mg/m2

Results

Dose from Mosteller BSA
181.8 mg
Body surface area (Mosteller)
1.818 m2
Body surface area (Du Bois)
1.810 m2

Step by step

  1. 1Values used
  2. 2BSA formulae
  3. 3Dose from Mosteller BSA= 181.8 mg
  4. 4Body surface area (Mosteller)= 1.818 m2
  5. 5Body surface area (Du Bois)= 1.810 m2

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Which BSA formula should be used?

Mosteller is the most common in oncology because it is simple and agrees closely with Du Bois.

Is BSA capped?

Many protocols cap BSA at 2.0 or 2.2 m2 for cytotoxic dosing; local policy decides.

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