Body Surface Area (BSA) Calculator

Calculate BSA for medication dosing and clinical indices

Formula

Mosteller: √(ht×wt/3600). DuBois: 0.007184×ht^0.725×wt^0.425. Haycock: 0.024265×ht^0.3964×wt^0.5378. ht in cm, wt in kg.

BSA formulas estimate the surface area of the human body. Mosteller is the simplest and most commonly used. DuBois is the original. Choice depends on clinical context and population.

How to Calculate Manually

1
Enter height and weight
2
Select units
3
Choose formula (Mosteller default)
4
Calculator shows BSA from all formulas

Reference Table

Weight/Height	Mosteller	DuBois	Haycock	Typical Use
70 kg / 175 cm	1.91	1.93	1.91	Adult male
60 kg / 165 cm	1.66	1.68	1.66	Adult female
10 kg / 75 cm	0.48	0.49	0.49	1 yr child
20 kg / 110 cm	0.79	0.81	0.80	5 yr child
3 kg / 50 cm	0.19	0.18	0.19	Newborn

BSA Calculator: Body Surface Area for Clinical Dosing

Body Surface Area (BSA) is a calculated measurement representing the total surface area of the human body. It's used extensively in medicine for chemotherapy dosing (mg/m²), calculating cardiac index (CI = CO/BSA), standardizing GFR (mL/min/1.73m²), and determining fluid resuscitation volumes for burn patients (Parkland formula)...

Frequently Asked Questions

What is BSA used for? Chemotherapy dosing (mg/m²), cardiac index normalization, GFR standardization, burn fluid resuscitation (Parkland), drug dosing in critical care.: Chemotherapy dosing (mg/m²), cardiac index normalization, GFR standardization, burn fluid resuscitation (Parkland), drug dosing in critical care.
Which formula is most accurate? Mosteller (√(ht×wt/3600)) is simplest and widely used. DuBois is the classic. Haycock is better for children. All give similar results for adults.: Mosteller (√(ht×wt/3600)) is simplest and widely used. DuBois is the classic. Haycock is better for children. All give similar results for adults.
What's a normal BSA? Adult male: ~1.9 m². Adult female: ~1.6 m². Child 10 kg: ~0.5 m². Child 20 kg: ~0.8 m².: Adult male: ~1.9 m². Adult female: ~1.6 m². Child 10 kg: ~0.5 m². Child 20 kg: ~0.8 m².

Calculator

Formula

Formula

How to Calculate Manually

Reference Table

BSA Calculator: Body Surface Area for Clinical Dosing

Frequently Asked Questions

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