Enter your height and weight into the calculator to determine your estimated body surface area.
Medical note: This calculator provides an estimate only and is not medical advice. Do not use this result to adjust medication doses or make treatment decisions—clinical use of BSA (including dosing) should be determined by a licensed clinician, especially for children, pregnancy, kidney/liver disease, cancer treatment, or other medical conditions.
BSA Formula
This calculator uses the commonly used Mosteller body surface area (BSA) formula (metric units).
BSA = SQRT ( H * W / 3600 )
- Where BSA is your body surface area (m^2)
- H is your height (cm)
- W is your weight (kg)
To calculate BSA, multiply your height by your weight, divide by 3600, then take the square root of the result.
This equation can be adjusted to use pounds and inches as the units as well. The calculator does this for you.
BSA Definition
BSA is defined as the total surface area of one’s body, also known as body surface area.
BSA Example
How to calculate BSA?
- First, measure your height.
Measure your height and convert the units to cm.
- Next, measure your weight.
Measure your weight and convert the units to kg.
- Finally, calculate your BSA.
Using the formula above along with your height and weight, calculate your BSA.
FAQ
BSA stands for body surface area. It’s a measure of the total estimated surface area that a human body occupies based on height and weight. The formula was derived from averages over populations, so the exact surface area may vary.
There is no single normal BSA for everyone; it varies with height, weight, age, and clinical context. BSA is mainly a body-size estimate used in some medical calculations and is not a direct measure of fitness or overall health. If you have questions about what your BSA means, discuss it with a licensed clinician.
