PASI Psoriasis Area Severity Index

Calculate the Psoriasis Area and Severity Index (PASI) — the gold standard for assessing psoriasis severity — by scoring erythema, induration, and scaling across four body regions weighted by area.

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

Calculate the Psoriasis Area and Severity Index (PASI) — the gold standard for assessing psoriasis severity — by scoring erythema, induration, and scaling across four body regions weighted by area

Each component has a specific meaning:

  • Four body regions weighted by area — The four body regions weighted by area recorded for the scenario being assessed.

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

How to Use

Enter the four body regions weighted by area for the scenario you are assessing. Calculate the Psoriasis Area and Severity Index (PASI) — the gold standard for assessing psoriasis severity — by scoring erythema, induration, and scaling across four body regions weighted by area. Use the pasi result to inform your calculation.

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Frequently Asked Questions