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Body Surface Area (BSA) Calculator
Quick answer
If weight is 70 kg and height is 170 cm, the body surface area is 1.82 m².
Mosteller formula: BSA (m²) = √(height (cm) × weight (kg) ÷ 3600).
Enter your values
30 kg200 kg
kg
100 cm220 cm
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Body surface area
1.82m²
Body Surface Area — an estimate of total skin surface, often used to size medication doses.
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About the Body Surface Area (BSA) Calculator
Body surface area (BSA) is the total area of your body's skin, in square metres. Doctors use it to dose some medicines, notably in cancer treatment, and to scale measurements such as cardiac output. The Mosteller formula is one of the simplest and most widely used.
Enter weight in kilograms and height in centimetres.
Mosteller formula
BSA (m²) = √(height (cm) × weight (kg) ÷ 3600)
Things to keep in mind
- Different BSA formulas give slightly different answers.
- Medicine doses must always be set by a clinician; this is not a dosing tool.
- An average adult has a BSA of roughly 1.6 to 1.9 m².
See how the result changes
Each table re-runs this calculator with one value changed and everything else left as it is.
Body surface area by weight
If weight goes from 70 kg to 105 kg, body surface area changes from 1.82 m² to 2.23 m² (+22%).
| Weight | Body surface area |
|---|---|
| 35 kg | 1.29 m² |
| 52.5 kg | 1.57 m² |
| 70 kgstart | 1.82 m² |
| 105 kg | 2.23 m² |
| 140 kg | 2.57 m² |
Body surface area by height
If height goes from 170 cm to 255 cm, body surface area changes from 1.82 m² to 2.23 m² (+22%).
| Height | Body surface area |
|---|---|
| 85 cm | 1.29 m² |
| 128 cm | 1.58 m² |
| 170 cmstart | 1.82 m² |
| 255 cm | 2.23 m² |
| 340 cm | 2.57 m² |
HEALTH & FITNESS GUIDE
A quick guide to Body Surface Area Mosteller
Use it to get an accurate body surface area in seconds — free, with no sign-up.
Instant results
See your body surface area the moment you enter your numbers.
Free, no sign-up
Every calculator here is free to use, with no account required.
Accurate & transparent
The same standard formula runs on our server for every calculation.
How to Use the Body Surface Area Mosteller Calculator
1
Enter Weight
Provide your weight, in kg.
2
Enter Height
Provide your height, in cm.
3
View Your Results
Get your body surface area instantly, calculated on our server.
What is Body Surface Area Mosteller?
This health & fitness tool works out your body surface area instantly, so you don't have to do the math by hand.
“One quick calculation, so you always know your body surface area before you decide.”
What Affects Your Body surface area
Your body surface area depends on the values below.
Weight
Changing your weight changes your body surface area.
Height
Changing your height changes your body surface area.
Example Result
Here's what you can expect from a body surface area mosteller calculation:
- Weight
- 70 kg
- Height
- 170 cm
- Body surface area
- 1.82 m²
Frequently Asked Questions
- How does weight affect body surface area?
- If weight goes from 70 kg to 105 kg, body surface area changes from 1.82 m² to 2.23 m² (+22%).
- How does height affect body surface area?
- If height goes from 170 cm to 255 cm, body surface area changes from 1.82 m² to 2.23 m² (+22%).
- How to calculate body surface area mosteller?
- Fill in weight and height in the Body Surface Area (BSA) Calculator above and your body surface area is calculated instantly. Change any value to see how the result responds.
- What does an example body surface area mosteller calculation look like?
- If weight is 70 kg and height is 170 cm, the body surface area is 1.82 m².
- Is this calculator free to use?
- Yes — every calculator on this site is completely free, with no sign-up or account required.
- How accurate is this calculator?
- It uses the standard formula and calculates on our server for every request, so results are precise for the values you enter.
- Is my data saved anywhere?
- No. Nothing you enter is stored or sent anywhere unless you choose to share a link with your values included.
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