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Body Surface Area (BSA) estimates the total surface area of the human body (m²), widely used to determine medication dosages — especially chemotherapy — and assess physiological functions.
Unit
Body Surface Area (BSA Calculator) is a medical measurement used to estimate the total surface area of the human body, expressed in square meters (m²). It is widely used in healthcare to determine correct medication dosages—especially in chemotherapy—and to assess various physiological functions.
BSA Categories (approximate ranges for adults, may vary by context):
Low BSA: Less than 1.5 m² (highlighted in orange) – May indicate undernutrition or small body size.
Normal BSA: 1.5 m² to 2.0 m² (highlighted in green) – Typical range for most adults.
High BSA: Above 2.0 m² (highlighted in orange) – Often linked to larger body size or overweight.
Very High BSA: Above 2.5 m² (highlighted in red) – May require special medication dosing considerations.
While BSA offers a more precise basis for certain medical calculations than weight alone, it does not account for body composition or fat distribution.
Our calculators apply published formulas as precisely as we can. Even so, no formula captures every detail of a real patient. Use the result as one input to your own assessment, not the final word.
