Body Surface Area Calculator

Calculate BSA using multiple validated medical formulas

Formula

Mosteller: √(ht×wt/3600); Du Bois: 0.007184×wt^0.425×ht^0.725; Haycock: 0.024265×wt^0.5378×ht^0.3964

Multiple formulas exist because BSA estimation has inherent uncertainty. Mosteller is simplest. Du Bois is the original. Haycock works well for pediatric patients.

How to Calculate Manually

1
Enter height in centimeters
2
Enter weight in kilograms
3
Calculator computes BSA using 5 formulas
4
Compare results - they should be similar
5
Use Mosteller for general purposes
6
Check protocol requirements for medical use

Reference Table

Age Group	Typical BSA Range (m²)	Common Use
Neonate (0-1 mo)	0.2 - 0.3	Drug dosing critical
Infant (1-12 mo)	0.3 - 0.5	Chemo, cardiac
Child (1-12 yr)	0.5 - 1.2	Medication scaling
Adolescent	1.2 - 1.8	Approaching adult
Adult Female	1.5 - 1.9	Standard dosing
Adult Male	1.8 - 2.3	Standard dosing

Body Surface Area Calculator: Medical BSA Formulas Explained

Body Surface Area (BSA) is a critical measurement in medicine, used for chemotherapy dosing, cardiac index calculation, and assessing burn severity. Unlike BMI, BSA estimates the actual surface area of the human body...

Frequently Asked Questions

What is BSA used for? BSA is used for chemotherapy dosing, cardiac index calculation, renal function assessment, and burn severity estimation. It's more accurate than weight alone for many medical calculations.: BSA is used for chemotherapy dosing, cardiac index calculation, renal function assessment, and burn severity estimation. It's more accurate than weight alone for many medical calculations.
Which formula should I use? Mosteller is simplest and widely used. Du Bois is the classic formula. Haycock is validated for children. For chemotherapy, check protocol requirements - many specify Mosteller.: Mosteller is simplest and widely used. Du Bois is the classic formula. Haycock is validated for children. For chemotherapy, check protocol requirements - many specify Mosteller.
Is BSA the same as BMI? No. BMI = weight/height² (kg/m²). BSA = surface area of the body (m²). They measure different things. BSA correlates with metabolic mass better than weight.: No. BMI = weight/height² (kg/m²). BSA = surface area of the body (m²). They measure different things. BSA correlates with metabolic mass better than weight.

Calculator

Formula

Formula

How to Calculate Manually

Reference Table

Body Surface Area Calculator: Medical BSA Formulas Explained

Frequently Asked Questions

Related Calculators

BMI Calculator

BMR Calculator

Ideal Weight Calculator

More Health Calculators

Absolute Neutrophil Count (ANC) Calculator

Anion Gap Calculator

Apgar Score Calculator

BMI Calculator

BMR Calculator

Body Fat Percentage Calculator