Body Surface Area Calculator
Estimate body surface area using the existing Mosteller height-and-weight calculation.
Your estimate
Enter your values and calculate. Results will appear here.
The output estimates external body surface area; it is not body fat or muscle mass.
How to use this calculator
Enter height and weight. Imperial entries are converted before the original calculation is used.
Formula and methodology
Mosteller BSA = √(height cm × weight kg ÷ 3,600), in m².
Worked example
At 175 cm and 70 kg, the existing Mosteller calculation gives approximately 1.8447 m².
What the result means
The output estimates external body surface area; it is not body fat or muscle mass.
Limitations
Do not use this result to calculate medication doses or make treatment decisions.
Common mistakes
Square metres here describe surface area, not a height or weight unit.
Frequently asked questions
Can I use this for dosing?
No. Medication and treatment calculations require clinical assessment and verification.