BSA Psoriasis Body Surface Area

Estimate the body surface area affected by psoriasis using the palm method (patient's palm ≈ 1% BSA) to quickly quantify disease extent for treatment decision making.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Estimate the body surface area affected by psoriasis using the palm method (patient's palm ≈ 1% BSA) to quickly quantify disease extent for treatment decision making

Each component has a specific meaning:

  • Palm method — The palm method recorded for the scenario being assessed.

Note: Interpret the bsa psoriasis result against the thresholds and context described above.

How to Use

Enter the palm method for the scenario you are assessing. Estimate the body surface area affected by psoriasis using the palm method (patient's palm ≈ 1% BSA) to quickly quantify disease extent for treatment decision making. Use the bsa psoriasis result to inform your calculation.

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Frequently Asked Questions