Calculate your Body Surface Area (BSA) using multiple medical formulas. BSA is used for drug dosing, cardiac calculations, and metabolic assessments.
BSA
1.948 m²
Dubois formula
BSA
1.948 m²
Dubois formula
| Formula | Description | BSA (m²) |
|---|---|---|
| DuBois | Most widely used (1916) | 1.9480 |
| Mosteller | Simple & accurate (1987) | 1.9515 |
| Haycock | Good for children (1978) | 1.9577 |
| Gehan | Gehan & George (1970) | 1.9616 |
| Boyd | Boyd formula (1935) | 1.9603 |
Average BSA: 1.956 m²Range: 1.948 - 1.962 m²
DuBois & DuBois (1916):
BSA = 0.007184 × W^0.425 × H^0.725
Mosteller (1987):
BSA = sqrt((H × W) / 3600)
Haycock (1978):
BSA = 0.024265 × W^0.5378 × H^0.3964
W = weight in kg, H = height in cm
| Category | BSA Range (m²) |
|---|---|
| Newborn | 0.2 - 0.25 |
| Child (2 years) | 0.5 - 0.55 |
| Child (9 years) | 1.0 - 1.1 |
| Adult Female (average) | 1.6 - 1.8 |
| Adult Male (average) | 1.7 - 2.0 |
Standard reference BSA: 1.73 m² (used in medical calculations)
Chemotherapy drugs are often dosed in mg/m² for more accurate dosing across different body sizes.
Cardiac output divided by BSA gives cardiac index, allowing comparison between individuals.
Glomerular filtration rate is often standardized to 1.73 m² BSA for comparison.
Burn area is calculated as percentage of total BSA to determine treatment.
Explore how changes affect your results
Compared to the general population
Your BSA
1.948 m²
Percentile
69th
There's room for improvement
Distribution
Small
1.500
Below Avg
1.650
Average
1.800
Above Avg
2.000
Large
2.200
Your Ranking
Top 69%
31% are higher
Based on your results
Your body surface area is 1.948 m², which is 113% of the standard 1.73 m² reference value.
BSA-based drug dosing helps ensure accurate medication amounts for your body size.
The DuBois and Mosteller formulas are most commonly used for adults.
BSA (Body Surface Area) is used for drug dosing, especially chemotherapy. Du Bois formula: BSA = 0.007184 × Height^0.725 × Weight^0.425. Average adult BSA: 1.7 m² (women) to 1.9 m² (men).
Body Surface Area (BSA) is the measured or calculated surface area of a human body, expressed in square meters (m²). It's used in medicine for drug dosing (especially chemotherapy), determining cardiac index, and calculating metabolic rates.
BSA correlates better with metabolic mass than body weight alone. Many drugs, especially chemotherapy agents, are dosed per m² of BSA for more accurate dosing across different body sizes. It's also used to calculate cardiac output and renal function.
Average adult BSA is approximately 1.7-2.0 m² for men and 1.6-1.8 m² for women. A "standard" adult BSA of 1.73 m² is often used as a reference value. Children have proportionally larger BSA relative to weight.
DuBois is the most widely used and accepted. Mosteller is simpler and equally accurate for most adults. Haycock is preferred for pediatric patients. The choice often depends on institutional preference and patient population.
BSA and BMI are different measures. BMI uses weight/height² and indicates weight status. BSA estimates actual skin surface area. A tall, lean person and a short, heavy person might have similar BSA but very different BMIs.
BSA
1.948 m²
Dubois formula