Body Surface Area Calculator
Compare adult Mosteller and Du Bois body-surface estimates from independently selected height and weight units.
YOUR CALCULATION
Result
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Calculation steps
Work through one step at a time or reveal the complete calculation. The steps use your current inputs.
How to calculate
Normalize height and weight to centimeters and kilograms, evaluate both published empirical area formulas and convert the selected result.
Mosteller m²=√(cm×kg/3600); Du Bois m²=0.007184×cm^0.725×kg^0.425
Worked example
Height 180 cm and mass 80 kg give a Mosteller estimate of exactly 2 m² under the formula. Other empirical formulas can produce different estimates for the same inputs.
Assumptions and input details
Adult geometry estimate with supported stature 0.8–2.5 m and mass 20–300 kg. Models are not direct measurements of skin surface and may differ with body shape and reference population. No medication dose, clinical index, pediatric assessment or treatment decision is calculated. Square-unit conversions preserve the same area estimate.
References: Primary comparison of empirical body-surface formulas and measured surfaces · Published formula comparison with explicit cm/kg coefficients
Unit definitions
Unit selection is independent of language. Each selector contains only units for its physical quantity. Calculations use defined base units internally.
Choose from 23 length definitions, including explicitly labelled regional measures. Area conversions square the length factor; geometric volumes cube it.
The 19 mass definitions distinguish avoirdupois and troy measures, metric and regional measures. Japanese kin is 600 g; mainland Chinese shijin is 500 g.
Regional measures are not interchangeable merely because their names look similar. This is a documented selection, not a claim to include every historical unit.
NIST measurement tables · Japanese traditional units · Mainland China and Hong Kong unit distinctions
Using this calculator
Can I enter my own problem?
Yes. Replace the example values with your own inputs. The result, calculation steps, tables and applicable diagrams update from those inputs. Blank or invalid values clear the result; example values are never silently substituted for missing inputs.
Are the results exact?
Results use floating-point arithmetic and displayed rounding. Read the formula, assumptions and any stated data precision before interpreting the result.
Is my input uploaded?
The calculation runs in your browser. No account, file upload or external AI service is required. Inputs are not saved between page reloads.
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