Body Surface Area Calculator
Fill in the values and the answer updates as you type.
How the Body Surface Area Calculator works
Mosteller: BSA = √(height in cm × weight in kg ÷ 3600). A 175 cm, 70 kg adult has a BSA near 1.84 m². Clinicians use BSA to scale some drug doses, so treat this as an estimate and follow a professional's instructions.
Inputs and results
The Body Surface Area Calculator takes 2 inputs and gives 3 results.
What you enter
- Height (cm) — starts at 175.
- Weight (kg) — starts at 70.
What you get
- Body surface area, Mosteller (m²)
- DuBois formula (m²)
- Haycock formula (m²)
Example: Body Surface Area Calculator with the starting values
With height 175 cm and weight 70 kg, the calculator returns:
| Body surface area, Mosteller (m²) | 1.84 |
|---|---|
| DuBois formula (m²) | 1.85 |
| Haycock formula (m²) | 1.85 |
Change any value above and the results update straight away.
Body Surface Area Calculator FAQ
How do I use the Body Surface Area Calculator?
Enter height and weight in the fields, then read body surface area, mosteller (m²), dubois formula (m²) and haycock formula (m²) in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Body Surface Area Calculator calculate?
Estimate BSA with the Mosteller, DuBois, and Haycock formulas. It returns body surface area, mosteller (m²), dubois formula (m²) and haycock formula (m²) from the 2 values you provide.
What values does the Body Surface Area Calculator start with?
It opens with height 175 cm and weight 70 kg so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Body Surface Area Calculator free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Body Surface Area Calculator for medical or health decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm medical or health decisions with a qualified professional. See the Disclaimer for more.