Clinical Calculators

Psoriasis | Eczema | Vitiligo | HS | Phototherapy

Validated clinical scoring instruments spanning multiple condition categories, implementing standardized measures used in clinical trials, treatment guidelines, and routine patient assessment.

Evidence-Based Clinical Scoring Tools

A suite of validated clinical calculators covering psoriasis, atopic dermatitis, vitiligo, and hidradenitis suppurativa, along with phototherapy dosing protocols. Each tool implements a standardized scoring system used in clinical trials, treatment guidelines, and routine patient assessment to quantify disease severity and treatment response.

Available Calculators

Select a calculator to begin scoring. Each tool includes a reference section with clinical background and primary literature.

Showing 8 of 8 calculators

Inflammatory Skin DiseasePASIScore: 0–72

Psoriasis Area and Severity Index

The first online PASI-HD (high discrimination) calculator, featuring standard PASI scoring alongside interactive sliders and palm-based area estimation. Evaluates erythema, induration, desquamation, and area across four body regions.

Inflammatory Skin DiseaseEASIScore: 0–72

Eczema Area and Severity Index

The recommended core instrument for measuring clinical signs of atopic dermatitis, endorsed by the HOME initiative. Evaluates four body regions across four severity characteristics with support for adult and pediatric weight sets.

VitiligoVASIScore: 0–100

Vitiligo Area Scoring Index

A quantitative clinical tool for evaluating vitiligo parametrically, using hand-unit area estimation and residual depigmentation grading across five body regions. The total body VASI (T-VASI) represents the sum across all regions.

VitiligoF-VASIScore: 0–3

Facial Vitiligo Area Scoring Index

A focused vitiligo severity measure restricted to the face, which accounts for approximately 3% of total body surface area. F-VASI is particularly important because facial vitiligo has the greatest impact on quality of life.

Hidradenitis SuppurativaIHS4Score: 0–100

International Hidradenitis Suppurativa Severity Score System

A validated dynamic scoring system for hidradenitis suppurativa that captures disease activity by counting three lesion types with weighted multipliers. Suitable for monitoring treatment response over time.

Hidradenitis SuppurativaHurleyStage: 1–3

Hurley Staging System

The oldest and most widely used classification for hidradenitis suppurativa severity. A qualitative, three-stage system based on the extent of abscesses, sinus tracts, and scarring, designed to guide surgical decisions.

PhototherapyFitzpatrickType: 1–6

Fitzpatrick Skin Type Classification

A numerical classification system (Types I-VI) for human skin based on its response to ultraviolet radiation. Widely used for phototherapy dosing, laser parameter selection, and skin cancer risk estimation.

PhototherapyNB-UVBDose: 0–5000

NB-UVB Dosing Calculator

Calculates narrowband UVB (311-313 nm) treatment time from Fitzpatrick skin type and measured irradiance. Includes a session-by-session dose escalation schedule following AAD-NPF phototherapy guidelines.

Developed in partnership withDermi

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